Agent Arthur Dales is a retired FBI agent, who has a history with Bill Mulder and appears in "Travelers" and "Agua Mala". He has a brother, Arthur (who was a cop in Roswell in 1947), a sister, Arthur and they had a goldfish named Arthur. Their mother wasn't very imaginative with names [The Unnatural]. There are also suggestions that all these Arthurs are aliens. [Season 5, 6]

Agent Pendrell is an FBI scientist who used to be a frequent resource for Mulder and Scully. He is first consulted over the computer chip found in Scully's neck [731], but seems to be able to analyze virtually anything. He walks through the computer records from the social security [Herrenvolk], does a material analysis [Teliko], examines Dr. Sacks with Scully [Tunguska; Terma]. He also had a crush on Scully. He was killed being shot in a bar when he stepped in front of a bullet made for Scully and a Marine officer [Max]. [Season 3, 4]

The famous Danny is the person Mulder phones (especially in the first two seasons) to check number plates, provide information, and generally be useful. He is paid with tickets to sporting events. In "Conduit", Daniel Bernstein is the person consulted by Mulder about Kevin's binary writing, and he calls him "Danny" on the phone. However, Chris Carter has said that Danny's surname is Valadeo. This is the name used in "Aubrey", when Mulder again consults Danny. Danny has provided some key information: telling Mulder what Kevin's drawings meant in "Conduit"; giving Mulder an address based on a phone number in "The Erlenmeyer Flask" and "Wetwired"; giving Mulder Richard Odin's history in "Red Museum"; looking up the adoption records in "Aubrey"; looks for missing people records in "Our Town"; runs fingerprints in "Leonard Betts" and looks up info in "Christmas Carol/Emily". [Season 1, 2, 3, 4, 5]

Tall, distinguished looking, and moving with regal grace, Sen. Richard Matheson embodies power and authority. Mulder told Scully in the first episode that certain contacts in Congress had enabled him to pursue his interests in the X-Files; we meet one of those contacts in "Little Green Men". Sen. Matheson summons Mulder to his office to send him on a mission to recover evidence of alien contact; he demonstrates a detailed knowledge of the space program as well as the Voyager mission, and indulges in a little wistful fantasizing as he imagines Bach's Second Brandenburg Concerto as Earth's musical representative to alien worlds. On a more practical level, he states with conviction that he can hold off the secret military UFO retrieval team for only 24 hours, and warns Mulder that these Blue Berets will kill him if they find him with the evidence. Here, it would seem, is an out-and-out ally for Mulder, unalloyed by fear or double-dealing. But although Matheson appears here as a power to be reckoned with, when Mulder goes to him for help [Ascension], X tells him that the Senator cannot help him now. Whether X is guessing, or is speaking for the Senator himself, he reminds Mulder that "they", including Beltway politicians, have only one policy: deny everything. Returns in "S.R. 819". [Season 2, 3, 6]

Albert Hosteen is a Navajo who helps Scully translate the secret information The Thinker has retrieved from the Department of Defense [Anasazi]. He also saves Mulder's life [The Blessing Way]. He returns in "Biogenesis" where he is dying of cancer. He dies in "The Sixth Extinction II: Amor Fati". [Season 2, 3, 6, 7]

Gibson Praise is the living proof that aliens infiltrated in the planet. We all have a part in our brain that is called the God Module. In the majority of people, this part is rarely used, but Gibson uses it all the time. This provides him the ability to read other people's thoughts [The End, The Beginning]. Abilities similar to Gibson's are also in Mulder's possession. He hid Mulder in the desert for the last year. [Season 5, 6, 9]

Penny Northern is one of the eleven women that underwent mysterious secret tests that later caused their cancer and eventual death. She appears in "Nisei" and "Memento Mori", where she dies. [Season 3, 4]

Betsy Hagopian is one of the eleven abducted MUFON women. She lived in Allentown, Pennsylvania. Betsy is mentioned a few times [Nisei, Memento Mori], but she is never shown, except lying on a table in Dept. of Oncology in Allentown Medical Center. Betsy was in the advanced stages of an undiagnosed cancer ailment and was undergoing treatment for nasopharyngeal tumor. Her body was full of tumors that didn't respond to any kind of treatment. She is the first one in the MUFON group who dies.

UFO buff and member of NICAP (National Investigative Committee of Arial Phenomenon). He was abducted in "Fallen Angel" and came back in "Tempus Fugit". Max knows a lot about Mulder because his travel expenses are a matter of public record and read his article in the Omni magazine about the Gulf Breeze sightings. He and NICAP have been following his career since he became involved with the X-Files. He suffers from epilepsy and probably schizophrenia and lives in a trailer. After his first disappearance, Mulder has his NICAP hat which occasionally appeared in his office. He uses the name Paul Gidney on flight 549 [Tempus Fugit]. He was taken from the flight by aliens. He tried to transport mysterious cargo stolen from the government. He was supposed to be killed by an assassin, but since he was kidnapped, nobody saw him. [Season 1, 4]

Dr. Heitz Werber is a black haired and brown eyed psychologist who was responsible for Mulder's regressive hypnosis when he searched for the lost memories for his sister from the night she was abducted. He also examined Billy Miles [Pilot]. He came back as the Cassandra Spender's doctor [Patient X]. After Cassandra's disappearance, he did a hypnosis on Scully in his offices in Silver Springs, Maryland. [Season 1, 5]

In "Pusher" she works in computer records - though she was also seen finding a magazine for Mulder and Scully. However, there she is in "Redux" doing telephone stuff. Is this a demotion after attacking Skinner in "Pusher"? Anyway, she is dark-haired and rather shy looking, though can certainly stand up for herself when faced with the man she is told is her attacker... [Season 3, 5]

Jeremiah Smith is a clone and a shapeshifter. He has "gone bad" on the Project. He has decided to use his powers to the betterment of the human lot and offer them "hope". Smith hints that healing and morphing are not the full extent of his powers. He can also make bullets disappear and clean blood-stained clothing [Talitha Cumi]. He can maybe read minds when he knows exactly who to morph into in order to worry Cigarette-Smoking Man (but this may come from knowledge of the records) and can diagnose CSM as having cancer, presumably just by looking at him, and can also cure him. These are the similar powers that Bounty Hunter has. There is a possible suggestion that Smith has hypnotic powers when he talks down the gun man. Smith worked at the social security offices. He was collecting data on the people in the form on genetic information derived from smallpox vaccinations. Scully suggests these are some sort of genetic marker and has been going on for fifty years. The human race has all been inventoried, in preparation for the colonization. He was killed by the Bounty Hounter [Herrenvolk]. [Season 3, 4]

Queequeg is a small red pomeranian, apparently a he. It was given to Scully by Clyde Bruckman on September 22 1995. It previously belonged to his neighbor, Mrs Lowe. She dies, and the dog started to eat her remains. Scully names it after a character in "Moby Dick" - the novel which also gave her "Ahab", her name for her father. In the novel, Queequeg was also a cannibal. At the end of "Clyde Bruckman's Final Repose", she is seen cuddling the dog while watching television. He then disappears until "War of the Coprophages", when she is shampooing him with "Die, Flea, Die". When Mulder calls she tells the dog to stay, but he runs all soapy into her living room. "Quagmire" is the only case she takes the dog on. Mulder doesn't like it and calls it "that thing", but Scully says she had to bring it. Her mother is out of town, and it's too late to contact all her usual dog minders - telling us how Scully normally made sure her dog was taken care of when she was away. Anyway, poor Queequeg got eaten by an alligator, after once more ignoring all Scully's orders. [Season 3]

Clyde Bruckman was a man who could forsee how people would die [Clyde Bruckman's Final Repose]. Worked in an insurance company called General Mutual. His favorite drink seems to be J.P. malt scotch whiskey with ice. He also used to take care of his neighbor, Mrs. Lowe. He gave Scully Mrs. Lowe's dog Queequeg after she died and died soon after. [Season 3]

Jose Chung (Charles Nelson Reilly) is a famous writer of books like 'From Outer Space'. Even Scully is a fan of his thrillers and calls 'The Caligarian Candidate' one of the greatest thrillers ever written. [Season 3]

Duane Barry is former FBI agent who believes he has been abducted by aliens. He's been out of the bureau since 1982 when he was shot in the line of duty and the bullet piercing his bilateral frontal lobes. This injury left him nearly incapable of functioning in society and effectively destroyed the moral center of his brain. He was kept in Davis Correctional Treatment Center in Marion, Virginia. He ran away and took four hostages. Hoping to avoid further abductions, he later kidnaps Scully to offer her instead to the aliens [Ascension]. He died on June 17, 1994, soon after his arrestation. [Season 2]

This genetic mutant who dines on human livers, was introduced in the third episode of the first season [Squeeze] and came back in "Tooms". Tooms makes nests and hibernates for thirty years between his liver-seeking attacks. In every period he needs to eat five livers. He was employed in the Baltimore Municipal Animal Control as a dog catcher. He also has a dog, a Norweigan Elkhound named Heinrich, which was used to hunt moose. His last residence was 66 Exeter Street, Baltimore, Maryland, but he seems to be dead since he went through the elevator stairs. [Season 1]