Tron is a 1982 American science fiction film written and directed by Steven Lisberger, and released by Walt Disney Pictures. It stars Jeff Bridges as the protagonist Kevin Flynn; Bruce Boxleitner in a dual role as security program Tron and Tron's "User", computer programmer Alan Bradley; Cindy Morgan in a dual role as program Yori and her "User", Dr. Lora Baines; Barnard Hughes in a dual role as the tower guardian Dumont and his "User", Dr. Walter Gibbs; Tony Stefano in a dual role as Ed Dillinger's secretary Peter and Sark's otherwise-nameless Lieutenant; and Dan Shor as Ram. David Warner plays all three main antagonists: the program Sark, his "User", Ed Dillinger, and the voice of the artificially intelligent Master Control Program. The film also features cameo roles by Jackson Bostwick and Michael Dudikoff (who makes his acting debut as a video game-conscript).