Many Star Trek alumni have made appearances on Mission: Impossible, most notably Leonard Nimoy, who was a regular during the series' Season Four (1969-1970) and Season Five (1970-1971), playing "The Great Paris", a master of disguise (Nimoy's character replaced Martin Landau's Rollin Hand). After appearing in the TOS episode "A Piece of the Action", William Shatner incidentally appeared in the Mission: Impossible episode "Encore," in which he played an aged gangster who thinks he has been transferred back to the 1930s.
Mission: Impossible II, the sequel to the film that relaunched the franchise, was written by longtime Star Trek writers Brannon Braga and Ronald D. Moore. The set of the same film included autoclave ovens that were reused as silver wall panels with round, light blue lights in Enterprise's sickbay in Star Trek: Enterprise. ("Broken Bow" text commentary, ENT Season 1 DVD) Mission: Impossible III was directed and produced by Star Trek and Star Trek Into Darkness director J.J. Abrams, under the production of his company Bad Robot Productions, and the fourth movie in the franchise was also produced by Abrams and Bad Robot. Both franchises are owned by Paramount.
The following is a listing of the actors who have made appearances on both Star Trek and Mission: Impossible.