Hubert Cornfield Director, Screenwriter Sidney Poitier Doctor Actor Bobby Darin Patient Actor Peter Falk Young Psychiatrist Actor Carl Benton Reid Chief Medical Officer Actor Mary Munday Bar Hostess Actor Barry Gordon Boy Patient Actor Howard Caine Tavern Owner Actor Anne Barton Mother Actor James Anderson Father Actor Yvette Vickers Drunken Woman Actor Clegg Hoyt Pete Actor Richard Bakalyan Jimmy Actor Patrick Lilly Imaginary Playmate Actor Stanley Kramer Producer S. Lee Pogostin Screenwriter Ernest Haller Cinematographer Frederic Knudtson Film Editing Ernest Gold Original Music Rudolph Sternad Production Design George Milo Set Decoration Lynn Stalmaster Casting