The Lone Gunmen is a TV series that aired on Fox from March 4, 2001 to June 1, 2001 for one season. It is a spinoff of The X-Files.

Cast & Character Origins

Characters	From	Date	Episode
John Fitzgerald Byers, Melvin Frohike, Richard Langly	The X-Files	February 18, 1994	S01E17: “E.B.E.”

Guest Characters

Characters	From	Date	Episode	Crossover Type
Walter Skinner	The X-Files	May 17, 2001	S01E11: "The Lying Game”	A
Fox Mulder, Morris Fletcher	The X-Files	May 11, 2001	S01E13: “All About Yves”	A

Outgoing Crossovers

Characters	Guest On	Date	Episode	Crossover Type
John Fitzgerald Byers, Melvin Frohike, Richard Langly, Jimmy Bond, Yves Del Harlow, Kimmy Belmont	The X-Files	April 21, 2002	S09E15: “Jump the Shark”	A
John Fitzgerald Byers, Melvin Frohike, Richard Langly	The X-Files	February 15, 2016	S10E05: “Babylon”	A
Richard Langly	The X-Files	January 10, 2018	S11E02: “This”	A

(Note: While they originate from The X-Files, I am listing appearances of the three Lone Gunmen that take place chronologically after their own spinoff show as “crossovers”.

The Lone Gunmen appearing in “Babylon” are a hallucination.

Richard Langly in “This” is an AI simulation.)