The show centers on FBI special agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson) who work on cases linked to the paranormal, called X-Files. At the end of the fourth season, Scully is dying of cancer. Mulder is convinced that her condition is a result of her earlier abduction, and is prepared to make a deal with the Syndicate to find a cure. While being pursued by an assassin responsible for a hoax alien corpse discovered on a mountaintop, Mulder fakes his own suicide, mutilating the assassin's face to provide a decoy body.[1] In the fifth season opener "Redux", he uses the distraction to infiltrate The Pentagon to find a cure for Scully's cancer, while Scully is able to uncover and reveal a Syndicate connection within the FBI. Due to the information he learns from Michael Kritschgau (John Finn), Mulder loses his belief in extraterrestrials. 
Later, as a rebel alien race secretly attacks several groups of former alien abductees, the agents meet Cassandra Spender (Veronica Cartwright), a woman who claims to be a multiple abductee and wants to deliver a positive message about aliens.  Eventually, Mulder has Scully put under hypnosis to learn the truth about her abduction after Cassandra goes missing and her son, Jeffrey Spender (Chris Owens), angrily attempts to push his way up in the FBI. The Syndicate, meanwhile, quicken their tests for the black oil vaccine, sacrificing their own to do so.[7][8] Later, the assassination of a chess grandmaster leads Mulder and Scully into an investigation that they soon discover strikes at the heart of the X-Files; they learn that the real target was a telepathic boy named Gibson Praise (Jeff Gulka)