Homicidal is a 1961 thriller film produced and directed by the self-proclaimed "King of Showmanship", William Castle. Written by Robb White, the film stars Glenn Corbett, Patricia Breslin, Eugenie Leontovich, Alan Bunce, Richard Rust, and Joan Marshall (billed as Jean Arless). It was released with a "fright break" that allowed patrons to receive a refund if they were too scared to stay for the climax of the film.