All the Kings Horses is a 1935 American comedy musical film adapted from the 1934 Broadway musical of the same name by Frederick Herendeen (musical book and lyricist) and Edward A. Horan (music composer) which was in turn based on the play Carlo Rocco by Lawrence Clarke and Max Giersberg. The film was directed by Frank Tuttle and starring Carl Brisson and Mary Ellis. The film tells the story of a film actor who changes places with a Ruritanian prince. The screenplay is based on a play by Lawrence Clark, Max Giersberg, Frederik Herendeen and Edward Horan.