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(TXF: "Little Green Men", "Colony", "Paper Hearts") Fox and his sister are seen playing Stratego before Samantha's abduction in the episodes "Little Green Men" and "Paper Hearts", but those sequences may not be historically accurate.
When Samantha is supposedly returned in the episode "Colony," she asks Mulder if it's too late for a game of Stratego, supporting the theory that they used to play it as children.
(TXF: "Colony") For information on Mulder's efforts to recover his sister, see the Relationships - Samantha Mulder section.
(TXF: "Home") Fox played right-field in baseball and owned a New York Nets replica basketball jersey.
(TXF: "Vienen", "The Truth") In 2008, he complied with a request from the FBI to assist, in an unofficial capacity, with the investigation of a single case.
(The X-Files: I Want to Believe) In 2016, he returned to the FBI and along with Scully they reopened the X-files and resumed their investigations into them. (TXF: "Demons", "Talitha Cumi") The Mulders had a rope swing out in their backyard, but didn't have a modem, fax machine or a cell phone.
During his time at Oxford University, Mulder watched a documentary about an insane asylum.
In one section of the program, a patient named Creighton Jones claimed to have been abducted by "fire demons." The documentary gave Mulder nightmares.