Coma is a 1978 American mystery thriller film based on the 1977 novel of the same name by Robin Cook. The film rights were acquired by director Michael Crichton, who also wrote the screenplay, and the movie was produced by Martin Erlichmann for Metro-Goldwyn-Mayer. The cast includes Geneviève Bujold, Michael Douglas, Elizabeth Ashley, Richard Widmark, and Rip Torn. Among the actors in smaller roles are Tom Selleck, Lois Chiles, and Ed Harris.