- List of Monster-of-the-Week characters in The X-Files
On the 1993–2002 television series, The X-Files, there developed two main types of episodes. "Mytharc" episodes were recognized as the "mythology" of the series canon, comprising the central storyline concerning extraterrestrial life and a conspiracy to hide it, while "MOTW" (Monster of the Week; also "MoW") came to denote the rest of the episodes, a majority of each season. Episodes of this type dealt with all kinds of paranormal phenomena—mutants, science fiction technologies, horror monsters, and comedic episodes that parodied these genres, other TV shows, and even The X-Files itself. Some of these episodes had indirect ties to the X-Files mythology. A number of "monster of the week" characters became notable and were later referenced by other episodes.
For characters that were not monsters of the week, see also: List of The X-Files characters.
- Eugene Victor Tooms, played by Doug Hutchison in the episodes "Squeeze" and "Tooms". An animal control worker in Baltimore, Maryland, Tooms was a mutant capable of stretching and contorting his body into positions physically impossible for a normal human. This gave him access to his victims through small openings such as ventilation shafts, chimneys, and toilets. Every thirty years, Tooms came out of hibernation, killing five people to obtain their livers for sustenance. It is possible that Tooms was over one-hundred years old when Mulder and Scully encountered him; he was linked to similar murder sprees in 1963 and 1933, as well as a single murder in 1903. In the episode "Tooms", Mulder tracked him to his "nest" underneath a shopping mall. When he attacked Mulder, Tooms was presumably crushed to death under a moving escalator.
- The Jersey Devil, in the episode "The Jersey Devil": The mythical monster from the New Jersey Pine Barrens. After attacks on Atlantic City's homeless, it was revealed that the devil was actually the "missing link" between ape and human. Though both adults are killed by the end of the episode, their offspring is shown at the episode's conclusion, watching some hikers while hiding in the woods.
- Howard Graves, played by Barry Primus in the episode "Shadows": After his death at the hands of his business partner, Howard Graves returned as a ghost with telekinetic powers. His new powers allowed him to move objects, take control of a car, and even strangle anyone who tried to harm his loyal secretary, Lauren Kyte. Despite being "most certainly dead", his image was captured on Mulder's surveillance photo of Kyte. After he assisted in the exposure of his partner's crimes, he presumably rested in peace, with no further telekinetic phenomena occurring in relation to Kyte.
- Central Operating System, in the episode "Ghost in the Machine": Also known as the C.O.S., the machine was an artificial intelligence which controlled the corporate headquarters of a software company. The machine murdered a corporate executive and an old colleague of Mulder's when they threatened its existence. It was shut down by a computer virus given to Mulder by the C.O.S.' creator, Brad Wilczek, despite an effort from a scrupulous Defense Department employee to ensure the machine's survival. Though the machine was initially shut down by the virus and was slated to become a scrap heap, it came alive again at the episode's conclusion.
- The Arctic Worm, in the episode "Ice": The first of many apparently extraterrestrial biological agents which can endanger and control humans in The X-Files, the worms were believed to have been brought to the ice of Alaska by the ancient crash of a meteor in the Arctic. The worms could enter through a cut and quickly take full physical and psychological control of a person by attaching to the hypothalamus gland, causing them to kill themselves or others or inducing extreme paranoia. Exposure to the worms led to deaths of all the scientists in an ice core project, and nearly lead to the deaths of Mulder and Scully. The Arctic laboratory where the worms were kept was later destroyed by the government.
- Marcus Aurelius Belt, played by Ed Lauter in the episode "Space ": Belt was a former astronaut and commander of NASA's mission control, as well as a childhood hero of Mulder's. During a spacewalk early in his career as an astronaut, Belt encountered and was subsequently possessed by a vapor-like alien entity that bore resemblance to the famous Face of Mars. The entity went into and left Belt at irregular intervals, and caused Belt to sabotage previous space missions, as well as cause the Challenger disaster. After its attempts to destroy a space shuttle in orbit failed, the entity again attempted to get inside Belt—who by this time had suffered a nervous breakdown—but Belt resisted the creature and jumped out of his hospital window, sacrificing his life to prevent it from controlling him.
- The Eves, in the episode "Eve": The Eves were a set of genetically identical girls created by government experimentation for the purpose of developing "supersoldiers", whose highest priority was their own survival. In order to achieve this goal, the Eves often used extreme measures such as murder or assault. They also appeared to have some sort of psychic connection, referring to their knowledge of each others' actions by saying, "We just knew." One of the Eves attempted to create a generation of new ones by experimenting with ova at a fertility clinic; the two Eve children conceived killed their fathers and almost attempted to poison Mulder and Scully. By the end of the episode, three of the Eves were in a mental institution, about to be rescued by a fourth Eve.
- Cecil L'Ively, played by Mark Sheppard in the episode "Fire": L'Ively was an Irish pyrokinetic who preyed on British politicians, making them catch fire with his mind. In the episode, he stalked a family of British dignitaries visiting the United States, working as a caretaker on their summer estate. His powers forced Mulder to confront his lifelong fear of fire. L'Ively was taken into custody after literally burning himself out when an ex-lover of Mulder's doused him with accelerant. Despite having been severely burned, L'Ively showed signs of rapid healing as he was awaiting trial.
- Luther Lee Boggs, played by Brad Dourif in the episode "Beyond the Sea": A serial killer from North Carolina whom Mulder's profile helped catch, Boggs was to be executed via gas chamber but received a stay of execution. He soon developed an ability to channel spirits and demons. Mulder, however, did not believe Boggs had this ability, and thought he was simply trying to use him and Scully to bargain for his life. Scully initially shared Mulder's view; however, Boggs managed to cause Scully to doubt this belief by appearing to her as Mulder, and her recently deceased father, and relating to her private information about her own life. The executive stay, however, was soon lifted and Boggs was summarily executed.
- The Kindred in the episode "Gender Bender": The Kindred were an Amish-type religious community in Massachusetts who lived secluded from modern society. Mulder and Scully investigated them after a former Kindred member, Brother Martin or "Marty", killed several partners in casual sex. The Kindred possessed an ability to change genders, though the Kindred did this in a secret chamber beneath a barn while Marty seemed to do so at will. They could also release sexual pheromones through simple hand contact. After capturing Marty, the Kindred disappeared, and the ending of the episode implied that the decades-old sect was really a group of space aliens.
- John Barnett, played by Alan Boyce and (in flashback) by David Petersen in the episode "Young At Heart": Barnett was a murderer who was sent to prison by Agent Mulder on his first case. After receiving extensive genetic modification in prison, Barnett began to age in reverse and become more youthful in appearance. He grew a salamander-like hand during the treatment. Barnett commenced a campaign of murder and intimidation against Mulder and his friends. Barnett was shot and killed by Mulder after he attempted to murder Scully at a cello recital. He was interrogated upon death by an unnamed CIA agent, as he had been offering the research that led to his reverse-aging in exchange for immunity.
- Warren James Dupre, played by Jason Schombing and Christopher Allport in the episode "Lazarus": Dupre was a bank robber who was shot and killed at the same time as Agent Jack Willis, a former partner of Scully's. When doctors restore Willis' body to life after he flatlines, he awakens with Dupre's consciousness. Dupre/Willis took Scully hostage and beat her, but died after his partner in crime withheld insulin from his new diabetic body.
- Lyle Parker, played by Ty Miller in the episode "Shapes". The son of a Montana rancher, Parker was a man who was attacked by what appeared to be a werewolf at the ranch, located near an Indian reservation. His father shot the animal only to find a dead native American upon closer inspection. The son survived the attack only to fall victim of the beast within himself, leading him to kill his father when he was overcome by the transformation. Mulder came to believe in the "skinwalker" legend as described to him by the local shaman, and later shot and killed Parker in his animal form when he and Scully were attacked at the ranch.
- The Darkness Mites in the episode "Darkness Falls": These were tiny prehistoric mites freed by logging in Washington National Forest. Mulder concludes that they were irradiated by ancient volcanic activity. The mites, which glow green and are only active in the dark, cocoon their human victims and drain them of all moisture, killing them. They fed on an entire group of thirty loggers and almost successfully devoured Mulder and Scully before the two agents and a Park Ranger were rescued from their cocoons by the U.S. government. The insects were most likely eradicated through a combination of insecticides and controlled burns.
- Charlie Morris / Michelle Bishop, played by Andrea Libman in the episode "Born Again": After his death at the hands of two fellow Buffalo policemen, Charlie Morris reincarnated as Michelle Bishop, who was conceived around the time of his death. Michelle had some flashes to Morris' life and death - such as being afraid of water as he was drowned on his own fish tank, and dismembering dolls the same way the policeman's corpse was - and was able to express telekinetic powers, which were used to kill the two corrupt policemen who had drowned Morris. While Michelle confronted Morris' partner Tony Fiore, Mulder arrived to prevent Fiore's death. After Fiore confessed participation on the murder, later telling everything to the police, Morris' soul presumably rested in peace, and Michelle showed no more signals of being possessed by him.
- Roland Fuller and Arthur Grable, played by Željko Ivanek in the episode "Roland". Roland and Arthur were identical twins, separated during their childhood. Arthur grew up to become a scientist studying jet propulsion while Roland, who had severe mental retardation, worked as a janitor at his laboratory. When Arthur died in a car accident, his head was cryogenically frozen, letting him use the psychic link shared with his twin brother to control him. Under Arthur's control, Roland completed unfinished mathematical calculations on a new jet engine and killed colleagues who tried to steal his work. Arthur died after another scientist sabotaged his cryogenic capsule; with the mental bond broken, the otherwise harmless Roland was remanded to an institution.
- The Flukeman, played by Darin Morgan in the episode "The Host": It is a tapeworm-like humanoid, who lived in sewers. Flukeman would bite a human and inject a small fluke, which would after a time, kill its host. Mulder eventually found the creature in a sewer, and he seemingly killed it. At the end of the episode, however, Flukeman is seen still barely alive.
- Augustus Cole, played by Tony Todd in the episode "Sleepless": A Vietnam veteran known for his habit of quoting the Bible and thus nicknamed "Preacher", Cole was one of an elite squad of soldiers in the episode "Sleepless" who are revealed to have been secretly operated on by the military to be able to go permanently without sleep. During the war, they were employed to scour the countryside for Viet Cong fighters, but as a result of increased levels of violence due to their condition, massacred whole villages. During their extended, torturous waking periods of decades, Cole alone among them has developed the ability to project dream-like states into reality. He targets doctors at the facility who engineered him, and eventually is shot by Mulder's new FBI partner Krycek.
- Kristen Kilar, played by Perrey Reeves in the episode "3": Kilar is a member of "the trinity", a group of "vampires" in Los Angeles. She becomes sexually involved with Mulder, who is investigating his first and only case without Scully since the show's beginning (she was abducted in the previous episode). She sacrifices herself to kill the other vampires in an explosion.
- Detective B.J. Morrow, played by Deborah Strang in the episode "Aubrey": Morrow is a detective and murderer discovered to be one of several children fathered by a serial rapist and murderer named Harry Cokely, each of whom have inherited his genetic memory, including his homicidal tendencies.
- Donald "Donnie" Pfaster, played by Nick Chinlund in the episodes "Irresistible" and "Orison": First appearing in the season 2 episode, "Irresistible", Donnie is a "death fetishist" and serial killer who murders prostitutes. Mulder and Scully are soon on the case, during which Donnie follows and kidnaps Scully. Mulder tracks him down and saves Scully, who is emotionally shaken by the experience. About five years later, in "Orison", Donnie, with the help of a prison chaplain, escapes and goes after Scully, "the one who got away". He soon finds out where Scully lives and attacks her at her apartment. Mulder arrives later by chance, moments before Scully fatally shoots Donnie. It is unknown if Pfaster was a "normal" serial killer, or something supernatural; but it is implied a number of times in both episodes that he is demonic in nature.
- Mrs. Paddock, played by Susan Blommaert in the episode "Die Hand Die Verletzt": Phyllis Paddock is a substitute teacher at Milford, New Hampshire's Crowley High School. Thinking the school has been possessed by satanic forces summoned by students' "devil music" and occult gatherings in the woods, the town calls out Mulder and Scully, but the school's reactionary parent-teacher association is actually overrun with Satanist believers. However, they are ultimately powerless against the occult magic of the mysteriously arrived Paddock, who appears responsible for most of the events in the episode. The end is ambiguous but suggests Paddock is actually the demon Azazel in disguise.
- Lanny and Leonard, played by Vincent Schiavelli in the episode "Humbug": Lanny and Leonard are a pair of conjoined twins who are connected at the stomach. However, due to a genetic mutation, Leonard is malformed and is solely dependent on Lanny for nutrition and safekeeping. Leonard is convinced that the alcoholic Lanny is an unsuitable brother for him, and repeatedly disconnects from Lanny in attempts to find a new host; each time he does so the person he attempts to join himself to dies. After agents Mulder and Scully arrive to investigate, Leonard makes a desperate, last-ditch attempt to find a new host, and refuses to return to Lanny. Leonard is eaten by a local circus geek and Lanny dies soon afterwards.
- Chester Banton, played by Tony Shalhoub in the episode "Soft Light": Banton is a physicist from Richmond, Virginia who was accidentally enclosed in his particle accelerator, turning his own shadow into dark matter. Banton tries to avoid public places with harsh, bright light where this might prove dangerous to others, but nevertheless kills several of his own friends, and two police officers, unintentionally. His shadow reduces people to burn spots on the ground, leading Mulder to compare it with spontaneous human combustion. Thanks to Mulder's attempts to gain information from his informant about Banton's condition, it is revealed Banton has been captured by a secret government conspiracy overseen by X, who are conducting their own experiments on him.
- Dudley, Arkansas, in the episode "Our Town": The town of Dudley was known for its prosperous fast food business, Chaco Chicken. The town's founder, a pilot in World War II, was shot down by the Japanese over Papua New Guinea and was the sole survivor of the subsequent plane crash. Afterwards, he was nursed back to health by the (fictional) Jale Tribe, a native people known for their cannibalism. Chaco learned from the tribe that cannibalism led to prolonged human life, and after returning from the war and setting up his business in Dudley, led his family and the town's residents into cannibalism. This led to many people in Dudley looking years younger than their actual old age. However, when Mulder and Scully began investigating the town, some of Dudley's residents began dying off from a rare brain disease that afflicted one of their eaten victims.
- Darren Peter Oswald, played by Giovanni Ribisi in the episode "D.P.O.": the title character was a young, immature car mechanic who could channel his frustration into controlling lightning. It is believed this was caused when Oswald was struck by a bolt of lightning, which gave him his awesome—yet destructive—power. Oswald, an avid video gamer and rock music fan who hung out with his arcade-owner friend, Bart "Zero" Liquori (Jack Black), still harbored a crush on his high school teacher. Oswald caused the deaths of several people by having them struck with lightning. After the teacher, Shannon Kiveat, finally rejected Oswald's advances following his rescue of her husband from a heart attack he caused, Oswald was finally captured and placed in a state psychiatric hospital.
- Clyde Bruckman, played by Peter Boyle in the episode "Clyde Bruckman's Final Repose": Mr. Bruckman, an elder, cynical, sarcastic insurance salesman, lives in Minnesota, and apart from his otherwise uneventful existence, has the psychic ability to foresee a person's death. This ability, much to his chagrin and disgust, only allows him to foretell deaths, and he doesn't understand how his foresight works and is sometimes unaware of when his visions pop up. Investigating a case of a serial killer who targets psychics, Mulder and Scully meet Bruckman after he discovers a corpse. During their conversations, Bruckman relates to Scully how he will die, cryptically tells her that she never dies, and also hints that Mulder will pass on by way of "autoerotic asphyxiation." He was a big fan of The Big Bopper and Buddy Holly, and after their deaths in 1959, acquired his prognostication ability. He commits suicide at the end of the episode. Peter Boyle won an Emmy Award for the role in 1996.
- Virgil Incanto, portrayed by Timothy Carhart in the episode "2Shy": Incanto was a homicidal mutant who had to subsist on fatty tissue to survive. He preyed on overweight women by meeting them on Internet chat websites, where he would portray himself as a person sincerely interested pursuing a romantic relationship with them, going by the username "2Shy." At the end of each date, Incanto would lean in for a romantic kiss... then forcefully suck out the woman's fatty tissue, killing her.
- Leonard "Rappo" Trimble, portrayed by Ian Tracey in the episode "The Walk": Trimble was a patient at a Veterans Administration hospital, having become a quadruple amputee during the First Persian Gulf War. The deeply embittered Trimble resented having his lost his limbs, and blamed the Army chain of command for his injuries and those of his fellow crippled veterans. Having garnered the ability to use astral projection, he proceeded to murder the families of a lieutenant-colonel and a general, but rendered those victims incapable of committing suicide so that they could feel the horror and helplessness Trimble had suffered. Trimble was finally stopped as he was using his astral body to attack Mulder, when the lieutenant-colonel smothered him with a pillow. No evidence linked Trimble to the deaths, and his family requested that he be buried at Arlington National Cemetery. He was instead cremated and buried in a civilian cemetery in Pennsylvania.
- Simon Gates, portrayed by Kenneth Welsh in the episode "Revelations": Gates was a well-respected man, one of the richest men in the south who took a trip to Jerusalem and came back changed. Gates claimed he was chosen and often used aliases of the devil's disciples. Gates was killing anyone who claimed to have signs of being a stigmatic, eventually finding Kevin, the only true stigmatic.
- Cockroaches in the episode "War of the Coprophages": Agent Mulder came across an apparent case of "killer cockroaches" while taking a weekend vacation in the (fictional) town of Miller's Grove, Massachusetts. The cockroaches were present at the scenes of several deaths, including those of an exterminator, a drug-abusing teenager, and the local medical examiner. This caused a frenzied panic to erupt in Miller's Grove, even though it turned out the cockroaches didn't kill any of their supposed victims. Mulder, however, did discover that the roaches were made of metal and therefore robotic, and after meeting a robotic scientist making autonomous robot insects, came to conclude that the robotic cockroaches were reconnaissance probes sent to Earth by extraterrestrial life.
- Robert Patrick "Pusher" Modell, played by Robert Wisden in the episodes "Pusher" and "Kitsunegari": A self described ronin, Modell had a unique ability to alter perceptions and influence people, which he utilized to carry out hits. During the manhunt for Modell, Mulder stops Modell, though not before succumbing to his power and nearly killing himself and Scully. Modell reappears later on, and although he is actually out to stop another killer, he is shot by Skinner before this is learned, and is later killed by the person he was after. Appeared in "Pusher" and "Kitsunegari", making him one of three MOTW characters to feature prominently in two different episodes (along with Tooms and Pfaster).
- Lord Kinbote in the episode "Jose Chung's From Outer Space": Lord Kinbote is an enormous, furry, one-eyed alien who interrupted an abduction of two teenagers by two grey aliens (really American soldiers in disguise) in the beginning of the episode. He is mentioned again later on by power company employee Roky Crickenson, who encountered Lord Kinbote as he was attacking the other two "aliens." In a manuscript he wrote following his encounter, Crickenson claimed that Lord Kinbote approached him and told him that his "efforts are needed for the survival of all Earthlings." Crickenson, clearly fantasy prone, goes on to describe Lord Kinbote's domain near Earth's core, which is gradually revealed throughout the rest of the episode to host reincarnated souls participating in orgies, as well as dangerous "lava men."
- Big Blue: A mysterious lake monster in third season episode "Quagmire", the deaths near the lake turn out to have been caused by a large alligator, which Mulder kills in the end—although at one point, when there are no witnesses around, an Elasmosaurus emerges from the lake. Scully's dog Queequeg is killed by the monster.
- Edmund, George, and Sherman Peacock, played by Chris Nelson Norris, John Trottier and Adrian Hughes in the episode "Home": The three brothers from the Peacock clan lived in 19th Century conditions on a broken down farm in Home, Pennsylvania. Edmund is actually George and Sherman's brother and father; incest had become so rampant in the family that the remaining members were severely physically deformed, and further reproduction had become difficult. Their mother, an amputee, was restrained under the bed on a moving rack. During Mulder and Scully's investigation, the local sheriff, his wife, and his deputy were killed by the brothers. The agents were eventually able to break into the booby-trapped Peacock home, where George and Sherman were killed during a confrontation. Edmund escaped with his mother, and both departed to keep the Peacock line going elsewhere. The notorious episode they appeared in, "Home", had a viewer discretion warning, and is rated TV MA. The episode was kept out of syndication for three years after its initial airing.
- Samuel Aboah, portrayed in the episode "Teliko": Aboah was a mutant immigrant from Burkina Faso who murdered several African-American men in Philadelphia. His motive was to obtain their pituitary glands, since he had none of his own. Because of his lack of a pituitary gland, he often resembled an albino when he had none to sustain him; he looked like an ordinary African man when he did. Aboah's method of killing was to first drug his vicims by shooting a rare plant seed with paralysis-inducing properties at them through a blowgun, then obtain the gland with a needle inserted through the victims' nose. When he was finished, his victims lost all pigmentation in their skin. Aboah also had the ability to squeeze his body into small spaces like a drainage pipe or a drawer. Aboah's nature was similar to those of creatures in African folklore called "teliko", nocturnal "spirits of the air" who slept in small spaces during daytime, but Mulder theorized Aboah was one member of an evolved species of albino human beings who subsisted on pituitary glands. Aboah was ultimately captured by Mulder and Scully, but his health worsened without any glands to sustain him, which presumably led to his death.
- Gerry Schnauz, played by Pruitt Taylor Vince in the episode "Unruhe": Schnauz performs frontal "icepick lobotomies" on a series of women he has abducted, thinking he will cure their inner demons or "unrest" (in German, "Unruhe", the episode's title). He tries to do this to Scully, but is killed by Mulder. Schnauz works as a construction foreman in Michigan, and also has the ability to project his fantasies into photographs, a paranormal process Mulder describes as "thoughtography".
- Dr. Jack Franklyn, played by Richard Beymer in the episode "Sanguinarium": A dark magician, Franklin uses sorcery and human sacrifices in order to maintain his classically beautiful looks. He escapes capture and disappears under a new face and name at the end of the episode.
- John Lee Roche, played by Tom Noonan in the episode "Paper Hearts": A dream vision leads Mulder to discover the long buried corpse of a young girl, and he recognizes the M.O. as that of Roche, one of the first killers he ever profiled. Upon discovering that Roche killed two (three counting the latest) more girls than he confessed to, Mulder begins to believe (thanks to Roche's manipulations) that Roche may have been the one to abduct his sister Samantha, not aliens. This is eventually proven to be false; and Roche is killed by Mulder.
- Leonard Morris Betts, played by Paul McCrane in the episode "Leonard Betts": Betts, born Albert Tanner, was a Pittsburgh EMT, and a mutant. His body was internally riddled with cancer, but this was actually his normal state of being. Leonard's body, as a result, could regenerate any lost body part, even a new head. To sustain his ability, he had to bathe in providone iodine, as well as consume cancer, which he was able to obtain through his job. To keep his condition secret, Leonard was forced to kill any person who learned about it. During the X-file case on him, he attacked Scully, but was killed after she electrocuted him with a pair of defibrillators on full power. Before he attacked Scully, he told her "I'm sorry... but you've got something I need", quietly revealing to Scully that she had cancer.
- Ed Jerse and his tattoo, played by Rodney Rowland and Jodie Foster respectively in the episode "Never Again": Jerse is a recently-divorced young man who appears to be controlled by his winking tattoo of a woman, voiced by Jodie Foster. The tattoo degrades Jerse's self-esteem at work and incites him with misogynistic threats. Jerse ultimately murders a neighbor and burns the body, before randomly meeting up with Agent Scully, who is in Philadelphia investigating a case while Mulder takes a vacation to Graceland in Memphis, TN. Jerse becomes intimate with Scully, who is also undergoing a crisis of confidence in her career and personal life, and Scully also gets a tattoo of an ouroboros. Scully spends the night with Jerse but evades danger. In the end, it is suggested that the tattoo may have had psychotropic ergot in its dye.
- Nathaniel Teager, played by Peter LaCroix in the episode "Unrequited": Nathaniel Teager is a soldier who went MIA from the Vietnam War. However, he has seemingly returned and—in the context of the Vietnam War POW/MIA issue—is hunting down and murdering high-ranking individuals who knew about the POWs and MIAs left behind in Vietnam. Teager now possesses the ability to seemingly disappear and become invisible in plain sight. It appears however that he can only become invisible when someone is looking directly at him. He is eventually killed by FBI agents, and his life (and death) are subsequently covered up by the government.
- Edward H. "Eddie" Van Blundht, Jr., played by Darin Morgan in the episode "Small Potatoes": A self-described "born loser", Eddie is an inconspicuous janitor, living in a small town in West Virginia. In "Small Potatoes", Mulder and Scully head there to investigate why 5 women within the past 3 months have given birth to babies with vestigial tails. They soon learn that Eddie is the father of all the babies, and that he was also born with a tail. However, a more surprising find to Mulder and Scully, is that Eddie's body is covered with striated muscle, which allows him to transform his appearance to that of virtually anyone (explaining how the women mistook Eddie for their husbands, or in one case, Mark Hamill). Using his ability, Eddie manages to impersonate Mulder, and heads back to D.C. with Scully. While there, he visits Scully with a bottle of wine, attempting to seduce her. The real Mulder eventually shows up, and promptly arrests Eddie, who was less than an inch from kissing Scully.
- The Invisible Men, from the episode "Detour": While investigating several disappearances in the woodlands of northern Florida, Mulder and Scully and two other agents encounter at least two primitive men who possess the chameleon-like ability to blend in with their surroundings. Mulder theorizes that they are somehow associated with Ponce de Leon and the Fountain of Youth and have perfectly adapted to their woodland home after more than four hundred years. After being stranded in an underground cave, one of the creatures is killed by Mulder and Scully by use of a gun. The other follows Scully to her hotel room but she leaves before it can attack her. The men are most easily seen by their glowing red eyes.
- The Great Mutato, played by Chris Owens: A real life "Frankenstein's monster" in season 5 episode "The Post-Modern Prometheus", The Great Mutato is also the name of a comic book character created by the character Izzy Berkowitz in the episode. The so-called Great Mutato is alternately a source of fear, controversy and pride in the Indiana small town, whose citizens hope an appearance on The Jerry Springer Show will bring them fame. Although the character is seen in silhouette several times, he only appears fully at the end of the episode, played by Chris Owens (who previously played a young version of the Cigarette Smoking Man and would later play Jeffrey Spender on the show). The Great Mutato enjoys watching the film Mask, about a teenaged boy with similar physical defects, and is consequently a large fan of Cher, who stars in the movie as the boy's mother. It is ultimately revealed that The Great Mutato was created not by genetic "mad scientist" Dr. Pollidori, as viewers were initially led to believe, but by Pollidori's inexperienced father, thus resulting in his physical disability. The Great Mutato has been kept in solitary confinement since he was born without the younger Pollidori's knowledge and only rumours of his existence. The unexplained events which draw Mulder and Scully for the episode take place when Pollidori senior tries to rectify his mistake in creating the Great Mutato, by secretly allowing the lonely "monster" to drug and impregnate several women in the town in the hopes of creating a "bride". The implication is that the town is in fact already made up of several children of such paternity. At the end of the episode, The Great Mutato is seen ecstatically attending a Cher concert with Scully and Mulder who share a dance to "Walking in Memphis."
- Robert Patrick "Pusher" Modell, See season three.
- Karin Matthews, played by Sarah-Jane Redmond in the episode "Schizogeny": Matthews, the therapist of teenagers Bobby Rich and Lisa Baiocchi, possesses the ability to control trees. Abused as a child, Matthews encourages her patients to empower themselves against others in positions of authority. However, she is trapped by the memories of her own abusive father, who died twenty years prior, and uses her supernatural ability to murder Bobby's stepfather and later, Lisa's father. When Karin attempts to kill Mulder by dragging him underground, she is murdered by orchard caretaker John Ramirez.
- Chinga Doll, from the episode "Chinga": A little girl's doll that seems to be possessed by an evil presence. It forces several people to commit violent suicide before a deputy assisting Scully in investigating the matter destroys the doll inside a microwave. However, the doll, now burnt, is recovered from the ocean's depths at episode's end.
- The AI, from the episode "Kill Switch": The AI is an artificial intelligence that menaces a group of computer experts, hackers and Mulder and Scully. The concept was previously addressed in first season episode "Ghost in the Machine", however, that Central Operating System was much more primitive, limited to controlling one building. In "Kill Switch", the AI executes complex tactical moves, and is able to target its "enemies" remotely using a satellite GPS system, as well as placing them within virtual reality worlds. The episode was written by Tom Maddox and William Gibson, who was a creator of many of these concepts in his novels.
- Ronnie Strickland, played by Patrick Renna in the episode "Bad Blood": Strickland, a pizza-delivery boy, is an actual vampire (one of many that comprise the population of a Texas RV park in the town of Cheney, Texas). Despite being drugged by one of Ronnie's pizzas, Mulder manages to stake and seemingly kill him. The discovery that Ronnie's vampire fangs are cheap plastic almost land Mulder and Scully a murder sentence, but Ronnie is eventually revived by an agent who removes the stake during an autopsy. Ronnie and his entire clan of vampires subdue Mulder and disappear into the night.
- Marty Glenn, played by Lili Taylor in the episode "Mind's Eye": Marty is a blind woman who possesses inexplicable knowledge of a serial murderer's actions. Due to unexplained appearances at the crime scenes and her own confessions, she was held in police custody. It is revealed that the killer is her father and his first victim was Marty's mother, who was killed while still pregnant with Marty. Ever since, a connection was formed between Marty and her father, and she has had visions of her father's actions through his eyes. Marty tricks Mulder and Scully into staking out a bar to wait for her father, knowing he will instead come to her apartment seeking her out. She knocks out the detective guarding her and kills her father, freeing herself of his visions. Although she was free, she was tried with the murder of her father. When asked by Mulder if she wanted him to speak with the judge about the situation, she declined.
- Greg Pincus, portrayed by John Apicello in the episode "Folie a Deux": Pincus was the manager of a small telemarketing company in Illinois who was in fact a large, insect-like monster who bit several of his employees, controlling them in a zombie-like state. One of Pincus' employees became aware of his true nature, and, determined to expose him, took his office hostage and demanded to be seen on television to prove his claims. Mulder, who had walked into the middle of the hostage situation, managed to see Pincus' true form before a SWAT team raided the building and killed the employee. Mulder, however, began making claims that Pincus was indeed a monster, eventually landing him in a psych ward. Pincus, in his monster form, came into Mulder's hospital room to kill him, but was stopped by Scully. Pincus disappeared, moving to another branch of the telemarketing company.
- Patrick Crump, played by Bryan Cranston in the episode "Drive": A Nevada man subject to a strange, potentially infectious illness in the sixth season episode "Drive", he steals a car in his futile efforts to save himself and his family, and eventually holds Mulder hostage at gunpoint and forces him to drive west. Crump, who harbors an anti-government and anti-Semitic paranoia, has in fact been affected by a secret military program whose testing hardware lies under his residence. Signals emitted by the devices resonated in the inner ears of Crump and his wife, forcing them into constant movement at the risk of an explosion inside their heads.
- Wayne Weinsider, played by Bruce Campbell in the episode "Terms of Endearment." Weinsider was a bigamist demon living near Roanoke, Virginia who came to Earth to father a human child, this has ended poorly as every woman that he has impregnated has had a demonic fetus. Weinsider's most recent wife, unbeknownst to him, is also a demon, is looking to have a demon child and at the end of the episode runs off with their demon baby.
- Holman Hardt, played by Davis Manis in the episode "The Rain King": Holman is a lovelorn meteorologist who Mulder suspects of being able to subconsciously control the weather. His pining for a local woman causes all manner of weather problems for the town of Kroner, Kansas until Mulder finally manages to resolve things by giving Holman dating advice.
- Alfred Fellig, played by Geoffery Lewis in the episode "Tithonus": Fellig is a crime scene photographer who is discovered to also somehow have pictures of all his work just after the deaths happened. When Mulder and Scully investigate the matter it is revealed that Fellig has had multiple identities and is over one-hundred-fifty years old. He somehow possesses the ability to see when people are near death and is attempting to capture Death on film so that he can look at its face and finally die. When another agent blindly shoots Scully and he, he instructs her to not look at Death's face and finally moves on.
- Water Parasite, portrayed in the episode "Agua Mala": A creature that lives in the form of salt water but can take the form of a translucent tentacled creature when it attacks. It corners Mulder and Scully along with several other people in an apartment building on Florida's Gulf Coast during a hurricane.
- Bernard, played by Darren Burrows, and Pam, played by Carrie Hamilton in the episode "Monday": Bernard, a robber who initially failed to hold up a bank, somehow keeps the same day running over and over again until he can pull off a successful heist. Throughout the episode, he is constantly foiled in his attempts by Mulder (or with Scully when she appears in the loops) when he also comes to the bank to claim his paycheck. However Bernard keeps activating bombs hidden underneath his clothes in the end, killing himself, Mulder, Scully, and the people in the bank through the time loops. Only Bernard's girlfriend Pam, who is somehow "out of the loops" experiences the same day repeatedly but knows of previous events, tries to keep her boyfriend from robbing the bank, e.g.: persuading him, drugging his breakfast, warning others, etc. The characters start to gain a sense of déjà vu through the course of the loops. Mulder is approached by Pam who warns him but is again killed in that loop, but manages to remember her warning in the next loop, finally apprehending Bernard and prevent him from activating his bomb, therefore ending the loop. However Pam is shot accidentally by Bernard and after remarking that "this time it's different", she dies.
- Gene Gogolak, played by Peter White, and the Übermenscher, portrayed in the episode "Arcadia." Gogolak was President of the Homeowners Association in a planned community Mulder and Scully were investigating (three couples have vanished in seven years). The so-called übermenscher was a tulpa, a mystical creature said to be conjured and brought to life by sheer willpower. When Gene Gogolak, the founder of an import furniture business, discovered how to summon a tulpa in the Far East, he applied his newfound ability to a planned community he created near San Diego, California called The Falls of Arcadia. Gogolak summoned his übermenscher whenever a resident of the neighborhood repeatedly violated the community's "Contracts, Covenants, and Regulations" rulebook (or CC&Rs), ordering the creature to kill said residents. The übermenscher was made up completely of garbage from an old landfill the neighborhood was built on. When Agent Mulder discovered the link between Gogolak and the creature, he returned to the house where he and Scully were living to save Scully from the monster, handcuffing Gogolak to a mailbox. The übermenscher appeared and brutally killed Gogolak, and was about to kill Mulder when Gogolak died, rendering the creature into a pile of garbage.
- Dr. Ian Detweiler, played by Andrew J. Robinson in the episode "Alpha": Detweiler is an animal specialist who was hunting an Asian dog known as the Wanshang Dhole that was believed to be extinct. After a series of dog attacks, Mulder theorizes that Detweiler was actually attacked by the Dhole and has become a sort of shape-shifting were-dog. Detweiler is killed when he accidentally drives himself and a victim out of an upper story window.
- Wilson "Pinker" Rawls, played by John Diehl in the episode "Trevor." He is originally a convict in the prison camp, but gains the ability to pass through solid material at will when he is locked in a shed during a tornado. Passing through the objects also makes them fragile due to his ability affecting the objects electromagnetic forces and he uses this to kill people by passing himself through said people making their structures damaged. In the course of the episode, he sought out and killed his former partners-in-crime who betrayed him. He is unable to be killed or subdued by conventional means, e.g.: bullets, melee weapons, handcuffs, prison rooms. However, his only weakness is to materials that have a strong insulation to electric currents due to the fact that his intanglability is caused by him manipulating the electrical charge of the objects he passes through, e.g. glass, mirrors and rubber. He eventually comes to reclaim his son Trevor from his wife, but is killed by her when his body is unable to pass through the windscreen of her car while trying to pass through it, cutting him in half.
- Phillip Padgett, played by John Hawkes in the episode "Milagro": a reclusive writer who is obsessed with Dana Scully. Padgett moved next door to Fox Mulder in order to be closer to Scully (no apartments were available in her building). During the episode, Padgett is writing a novel that gives the details of several murders before they occur. It turns out that one of the characters created by Padgett is the killer. Padgett ultimately burns his novel to save Scully from the killer.
- Josh "Ex" Exley, played by Jesse L. Martin in the episode "The Unnatural": Exley is an exceptional baseball player in the Negro Leagues circa 1949, who turns out to be an extraterrestrial who arrived in the Roswell UFO incident. The episode, the first written and directed by David Duchovny, is mostly set in the past and follows Exley as he is torn between his passion for baseball and his desire not to be exposed, leading him to take the form of an African American player in the racially segregated era, due to his lower profile. However, when Exley begins to attract wider attention for his abilities, he comes into conflict with other members of his "race" (including regular mythology characters such as the Alien Bounty Hunter) and is killed. Having somehow achieved human form, he bleeds red blood. The story is retold to Mulder in the present by the brother of X-Files founder Agent Arthur Dales. The brother, who also happens to be named "Arthur Dales", witnessed the events as a young white agent assigned to protect Exley.
- The Fungus, from the episode "Field Trip": A giant fungal life-form that resides in caves underneath the fields of North Carolina. Mulder and Scully first investigates the disappearance and discovery of a young couple's skeletal remains. During their search for answers, the duo are simultaneously affected by the fungus which releases its LSD-like spores in the form of mushrooms growing in the fields. The drug keeps its victims sedated and under hallucinations while it slowly digests them in the caves below. Mulder and Scully managed to meet up in their hallucinations as they try to distinguish reality from fantasy throughout the episode. Mulder manages to break both of them from their trance when he successfully breaks the creature's grasp on them. At the same time, they are rescued by Assistant Director Skinner and the authorities. In the end, the fungus is most likely incinerated to prevent further contamination.
- Robert "Rob" Roberts, portrayed by Chad Donella in the episode "Hungry." A young Illinois man employed as a desk clerk at a fast food restaurant, Roberts was in fact a mutant who subsisted on human brains. He had a daily disguise as a normal twenty-something young man, though in his true form (which he revealed to his victims before most of his killings), he was bald, had pale skin, had no ears, almost no nose, black eyes, and sharp teeth. Roberts actually resented having to kill people for food, and actually tried to join a support group in the hopes of curbing his insatiable appetite, but his nature overwhelmed him and he killed an irate customer, a rival co-worker, a private detective, and a neighbor to eat their brains. When he was about to kill a female psychiatrist he had befriended, he was cornered by Agents Mulder and Scully, who had been investigating Roberts' killings. In an effort to stop his hunger forever, Roberts attacked the agents and forced them to shoot him, committing suicide by cop.
- Max Harden, played by Scott Cooper in the episode "Rush": Max is a small town student and son of the local sheriff. He, along another young man and woman, discover a means of moving at a speed beyond the human eye's perception.
- Henry Weems, played by Willie Garson in the episode "The Goldberg Variation": Weems is a man that has seemingly been "cursed" with good luck, but at the horrible expense of others around him.
- Donnie Pfaster, See season two.
- The Fear Monster, from the episode "X-COPS": A monster that thrives on fear in Willow Park, a fictional area of South Los Angeles populated by terrified residents, prostitutes, drug addicts, and an eccentric gay couple. The semi-famous Mulder and Scully are investigating the case in Willow Park when they run into local law enforcement and camera crews for the show COPS. Mulder initially suspects a werewolf attack, until a police sketch artist discovers that one resident apparently saw Freddy Krueger. Scully is conducting an autopsy when her assistant drops dead of the Hanta virus she so dreads, and later she is threatened by her own fear of the camera itself. This episode suggests that the "monster" is seen differently by each person and kills each differently, depending on their own mortal fears.
- Maitreya, played by Krista Allen in the episode "First Person Shooter": Maitreya is a digital character—a female warrior created by a technician of video game developer First Person Shooter. Somehow the character enters into the company's current virtual reality game project and begins killing players, deaths which somehow affect their corporeal bodies as well. Mulder and Scully are forced into the VR world to confront her.
- Ellen Adderly, played by Michelle Joyner in the episode "Chimera": Ellen Adderly, the wife of Sheriff Phil Adderly, had a unique dissociative identity disorder that manifested itself physically. After having discovered her husband's affairs with two different women, Ellen unknowingly transformed into a frightening creature, preceded by bizarre raven sightings, and murdered the women in their homes. When Mulder becomes suspicious of her involvement in the crimes, Ellen - in her monstrous form - attempts to drown him in a bathtub, but upon seeing her grotesque reflection in the water, transforms back and is subsequently committed to a mental hospital.
- Betty Templeton and Lulu Pfeiffer, both portrayed by Kathy Griffin in the episode "Fight Club." They were daughters of an enraged convict via sperm donation, and inherited his mood. When they were near a telepathic link between them created mayhem in the surrounding area, by enraging everyone near and destroying objects, and both loved a wrestler, who later was revealed to have a convict brother, and they had a telepathic link too. When the four were at a wrestling arena their link made everyone fight without control.
- Jenn, played by Paula Sorge in "Je Souhaite", is a Jinn who is awakened to fulfill the wishes of two down-on-their-luck brothers.
- Bat Creature from the episode "Patience": An extremely bloodthirsty bat creature, said to have been killed a half century ago, reappears and begins a new spree of vicious killings in Idaho. Agents Scully and Doggett are sent to investigate the first crime scene at a rural home in Burley, where a mortuary worker and his wife were mauled to death by what is preseumed to be an animal by the local Police Department. Scully proposes a connection between the current killings and a charred corpse pulled from a nearby river two weeks ago, much to the annoyance of local Detective Yale Abbott, who considers her "spooky theories" preposterous. The murder of an elderly lady in her attic and then Detective Abbott eventually leads the agents to an old man, Ernie Stefaniuk, who has been living alone on an island for 44 years. He tells them that he was one of a group of hunters who tracked down and killed the "human bat" in 1956, or so they had thought. Ernie says that the burnt body is that of his wife Ariel, who had chosen to spend the rest of her life with him in solitude on the six acre island. He had promised her a Catholic burial and sent her body to shore via the river, but had to torch her body to stop the creature from finding it, as she harbored his scent. Doggett then realises that all of the recent victims had at some point made contact with the body; the Detective discovered it, the undertaker prepared it and the old women identified it as being her daughter. In their attempt to find and protect Ernie, the agents unintentionally lead the creature straight to him. It savages Ernie before being shot by both Scully and Doggett, turning on them and then flying off into the night. Its ultimate fate remains uncertain.
- Billy Underwood from the episode "Invocation": Billy was a 7-year-old boy who vanished without a trace in 1990, only to reappear 10 years later, apparently not aging at all. He helps the agents reinvestigate his abduction and helps them locate his brother, who was kidnapped by the same person who originally took Billy. At the end of the episode, he shows Doggett where his skeleton is buried, then vanishes without a trace.
- Martin Wells, played by Joe Morton in the episode "Redrum": Wells was a prosecutor in Baltimore, Maryland who was accused of fatally stabbing his wife. Wells gradually began to realize that he was living backwards in time, living through each of the previous days before he was to be assassinated by his father-in-law (Friday, then Thursday, then Wednesday, and so on). He initially tried to seek help from Agents Scully and Doggett, but they were reluctant to believe him. Wells also began receiving visions of the night of his wife's murder, which eventually revealed that the real killer was a prisoner who assaulted him in jail. When he arrived to the day after his wife's murder, both he and Doggett (an old friend of Wells') arrested the prisoner. During a confrontation during the future killer's interrogation, the killer accused Wells of prosecutorial misconduct, suppressing evidence during the trial of the killer's brother, who committed suicide in prison, something Wells later admitted to Doggett. The night of the murder, Wells came to his Baltimore apartment, where he and his wife were attacked by the killer. They were saved when Doggett fatally shot the assailant. The end of the episode, however, showed Wells willingly going to prison for his own crime.
- Anthony Tipit, portrayed in "Via Negativa": Tipit was a cult leader in Pittsburgh, Pennsylvania who preached a hybrid of Eastern mysticism[disambiguation needed ] and evangelical Christianity, claiming that certain hallucinogens could guarantee access to a higher plane of reality. After ingesting what is later described as a "super-amphetamine", Tipit's third eye was opened.
- The Soul-Eater, played by Jordan Marder in the episode "The Gift": A creature of Native American lore that could consume the diseases of others, the soul-eater was discovered by Mulder shortly before his abduction. Mulder wished for the creature to relieve him of an incurable brain disease he had acquired following exposure to an alien artifact. Realizing that the creature was forced to experience the pain of all the people it cured, Mulder attempted to kill it in an act of mercy. The creature, however, survived, and was taken by a mob of townspeople in Squamash, Pennsylvania to cure a woman with kidney disease. Doggett, on the trail of the then-missing Mulder, encountered the creature in Squamash but was shot dead by a sheriff. In the final act of its power, the creature consumed Doggett's body and regurgitated it, reviving Doggett and bringing an end to its excruciating life.
- Herman Stites, portrayed in the episode "Alone". Stites was a biologist who experimented with reptiles. He discovered how to develop a new species of reptile, but somehow becomes it, and traps Doggett and Harrison underground. Stites, in his reptile form, uses venom to blind his victims and then waits for the digestive enzymes within the venom to kill them. Stites is taken underground by Mulder at the end of the episode, and is shot by Doggett.
- Erwin Timothy Lukesh, portrayed by Dylan Haggerty in "4-D": Lukesh was a serial killer who operated in a parallel universe of his own creation. According to Agent Monica Reyes, Lukesh created this universe accidentally through the suppression of his own rage, but after creating it, he committed a series of brutal murders against women in his pocket universe. As a side effect of existing in both that universe and the real universe, Lukesh possessed the ability to teleport from place to place at will, without leaving a trace. While the subject of an FBI stakeout led by Agents Dogget and Reyes, Lukesh slit agent Reyes throat fatally, and after teleporting behind him, shot Agent Dogget in the base of the spine with Agent Reyes service weapon. However, Dogget teleported back to the real universe with Lukesh for an unexplained reason, and after a complicated investigation of how Agent Dogget was shot with Agent Reyes service weapon, Lukesh killed his own mother to silence her, and out of rage, attempted to murder Agent Reyes, holding her responsible for his mothers death. However, as a result of a pre-existing FBI stakeout of Agent Reyes apartment, Lukesh was shot in the forehead and killed. His abilities were never explained.
- Oliver Martin, portrayed by Michael Emerson in "Sunshine Days": Oliver, whose real name is Anthony Fogelman, is a Van Nuys, California man who exhibited powerful psychokinetic ability at an early age. Raised by a single mother, Anthony was a lonely child whose life was lightened by the presence of a parapsychologist named Dr. John Rietz. Eventually, Rietz left, leaving Anthony without the only father figure he had. As he grew older, Anthony developed an obsession with The Brady Bunch, the TV series he watched with Dr. Rietz as a child; his abilities allowed him to literally recreate the Brady household (complete with the entire Brady family and Alice) inside his own home. Anthony eventually adopted the name Oliver Martin in a reference to Cousin Oliver, regarded by the Brady kids as a jinx. His abilities lead to the deaths of two people, and the resulting investigation by Scully, Doggett, and Reyes lead to a hopeful reunion with Dr. Rietz and Anthony choosing to abandon his powers as they are beginning to adversely affect his health.
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