The Lone Gunman is the name of the magazine that Mulder's three conspiracy theorists publish. They are Richard Langly, Melvin Frohike and John Fitzgerald Byers. Anytime Mulder and Scully need information about an aspect of one of their cases the Lone Gunmen are there to provide it. They first met Mulder when they still worked for their respective computer companies. All three were at the same software convention and were rivals, that was until they were all drawn into a conspiracy with an unknown woman and Mulder, who was pursuing her in connection with a brain-washing drugs conspiracy. They later resolved this when they came in contact with the woman again, years later with Scully helping them investigate. Byers had fallen in love with this woman, Susanne Modeski, the first time they had met, when Mulder was after her. They once again help her in a drugs conspiracy, in the episode "Three of a Kind". In the end Susanne has to leave with a new identity, Holly Fitzgerald, after the operatives from the government discover her plan off revealing the dangerous biological weapons they have been developing. Susanne asks Byers to join her in her new life but he says she'd be safer on her own. Before she leaves she gives him the wedding ring she was to give to her fiance who was murdered. Mulder and The Lone Gunmen have been close allies since they first met. We have seen the Lone Gunmen come to the assistance of John Doggett during Season 8, helping in the search for the missing Mulder. Frohike has had a thing for Scully since he firt met her.

    Jeffrey Spender was a bit on the clueless side when it came to what was going on with his father and Mulder and the aliens. He only got the job of running the X-Files because his father C.G.B. Spender (Cancer Man), pulled some strings to get him there, for obvious reasons. He never really knew the whole story behind his mother's abductions and how she was central to the project of creating a alien-human hybrid. Cassandra Spender was the first successful attempt at creating such a hybrid. In the end Jeffrey just couldn't accept that his father would do such a thing as to use his mother like that. This led to his despising his father and his eventual betrayal of him. It prooved too much as Cancer Man himself killed his own son in cold blood, all because of his non-compliance to his agenda. He had deffered the X-Files back to Mulder thus signing his own death warrant, only once again he wAs too naive to see the extent to which his father would go in the persuit of his goals. A short but tragic life on the X-Files.

Krycek first came into the X-files in the episode "Sleepless" as Mulder's new partner, but it was clear from the start that Krycek was working both sides. Mulder learned of his duplicity in the episode "Ascension". Since then Krycek has turned up every so often, on different sides. Krycek next showed up in "Piper Maru", Mulder discovered he was selling the secrets off the digital tape. Mulder encountered him in Hong Kong waits for him in the Hong Kong airport. Krycek said he would take Mulder to the tape if he didn't kill him. However while in the airport bathroom Krycek was infected with the black oil. At the end of "Apocrypha" Krycek ends up in a silo in North Dakota. The black oil leaves his body through his nose, eyes and mouth and sinks down into the ship.

Mulder first came in contact with 'Deep Throat' in the episode "Deep Throat". He became one of the few people Mulder could trust and a great source of inside information on the cases he and Scully investigated. Mulder never really found out exactly who he worked for, but he indicated to Mulder that he had a job high up and risked his life everytime they met. He admitted lying to Mulder many times but he still wanted to help bring down the organisation he belonged to. He told Mulder he was one of the few people in the world to have seen and killed an alien. He claimed this was his motivation for helping Mulder, to make up for what he had done. In the end he proved he was Mulder's ally completely by sacrificing his own life to save Mulder. Deep Throat last words will always be remember. He told Scully with his last breath, "Trust Noone". He was killed by Crew-Cut man in the last episode of season 1, "The Erlenmyer Flask". Gone but not forgotten.

Melissa Scully was very different to her younger sister Dana. She believed in miracles and the power of crystals, charms and other New Age stuff. They're mother said that "unlike her older sister", Melissa, Dana was a tomboy when they were children. She is first seen at Scully's bedside holding her hands over her in order to try and communicate with Dana's soul. Mulder found all this very annoying. However, it was Melissa who persuaded Mulder to go to say goodbye to Scully before it was too late. In the "Blessing Way" Melissa is killed, the result of a botched attempt by Krycek on Scully's life. Scully still remembers her and is upset and angry when the investigation into her death is called off due to lack of evidence. A few years later Scully is staying with her mother at her brother and sister-in-law's house for Christmas. She gets a phone call which leads her to a dead woman in a bath, who had killed herself, or so it would seem. Scully thought that the voice sounded like her sister Melissa and was upset by it. The woman who had died had a little girl, who looked just like Melissa when she was that age. When Scully discovered the child was adopted she believed that she was Melissa's daughter. However when she had DNA testing done, it turned out that the girl, Emily, was Scully's daughter. Alas the doctors discovered that Emily was dying and when the nurse did a proceedure on her the same toxic green fluid which killed many others was released. Sadly Emily later died of her condition and Scully was heartbroken.

X was Mulder's contact after Deep Throat died. He told Muder from the outset that he did not want to end up dead like Deep Throat. He even refused point blank to help Mulder and Scully on several occasions. Skinner had to beat the information out of him that Scully needed to find Mulder in "End Game". He has proven that he is a killer, executing the man who was trying to steal a sample of Scully's blood in "One Breath". He uses Mulder aswell. In "Soft Light he used him to find Dr. Banton and turned him over to the people he had been hiding from. In "Nisei" he warns Scully that Mulder shouldn't go on the train with the Japanese man on it Mulder had been chasing. He saves Mulder by carrying him out of the train car before it explodes in "731". X dies in "Herrenvolk". He goes to Mulder's apartment because the X is on the window, but he finds it empty and realises that it could be a trap he leaves quickly but is shot by an anonymous person as the elevator doors open. He leaves the letters SRSG in his own blood on the floor at the enterance to Mulder's apartment.

In "Herrenvolk", Mulder's source, X writes the letters "SRSG" in his own blood outside Mulder's apartment. He dies shortly afterwards. This clue leads Mulder to the office of the Special Representative to the Secretary General of the United Nations. The representative's assistant, Marita Covarrubias, gives Mulder a file folder with a photo of his sister, Samantha and several girls who are identical to her, working in a field. She tells Mulder, "Not everything dies, Mr. Mulder". This led Mulder to find out about the bees and meet Jeremiah Smith. Marita was helping Mulder at first but then we learn in season five episode "Patient X" that she was working with Krycek. As a result of this alliance, she becomes infected with the black oil, when she steals the boy who witnessed the rebel aliens from him. Krycek had infected the boy, exactly in anticipation of that eventuality. She gets her revenge on the Cigarette Smoking Man for taking her of the project to secure the spaceship in seventh season finale "Requiem", by helping Krycek push him down the stairs. He is in a weakened state and wheelchair bound due to his illness.

Agent Fowley and Agent Mulder used to date each. They started going out when he left the Academy to join the FBI. She and Mulder discovered The X-Files together. Although, she ended their relationship to take an assignment in Europe to secretly cover up reports of abductions from all across Europe. Diana's background in parapsychology allowed her to take part in the investigation of Gibson Praise in the fifth season finale, "The End". Scully distrusts her from the beginning. This distrust for her is confirmed when Mulder discovers in "One Son" that Diana is working for the Cigarette-Smoking Man. She was assigned to re-open the X-Files with Agent Jeffrey Spender, and continued to obstruct Mulder and Scully's search for the truth. However, Diana feels bad for betraying Mulder and helps Scully to rescue Mulder from the CSM. She was helping him in transferring Mulder's DNA to him. Scully is sorry to have to tell Mulder that Diana was murdered as a result of helping her to rescue him, at the end of sixth season episode "Sixth Extinction ll. - Amor Fati".

Kersh, was once a military jet pilot in Vietnam, he was put in charge of Mulder and Scully in "The Beginning" when they were removed from the X-files for a while. Kersh never believed in Mulder and Scully's work, and was always on their case about travel expenses and working on X-Files without authorisation. At the beginning of Season Eight, he is promoted to be the new Deputy Director of the FBI. He assigns John Doggett as the head of the task force set-up to find the missing Mulder. He warns Scully and Skinner that if anything about aliens and Mulder being abducted becomes public, they will be promptly fired. While his primary goal may be to save face for the FBI, Kersh may have connections to the shadow government in charge of covering up the information about the aliens and colonisation. However it has since come to light in Season 9 that Kersch may in fact be helping in the search for the truth started by Mulder all those years ago. John Doggett is not entirely convinced.