Skidoo is a 1968 American comedy film directed by Otto Preminger, starring Jackie Gleason, Carol Channing, Frankie Avalon, Fred Clark (who died on December 5, two weeks before the film's release), Michael Constantine, Frank Gorshin, John Phillip Law, Peter Lawford, Burgess Meredith, George Raft, Cesar Romero, Mickey Rooney, and Groucho Marx playing a top mobster named "God". It was written by Doran William Cannon and released by Paramount Pictures on December 19, 1968. The screenplay satirizes late-1960s counterculture lifestyle and its creature comforts, technology, anti-technology, hippies, free love and then-topical use of the drug LSD.

Singer-songwriter Nilsson, who wrote the score and receives credit as a member of the cast, appears in a few brief scenes with Fred Clark, as both portray prison tower guards swaying to Nilsson's music while under the influence of LSD.