The story begins when Irma (Marie Wilson) and her friends head westward on the incorrect assumption that Steve Laird (Dean Martin) has landed a movie contract. During the train trip to California, Steve's goonish pal Seymour (Jerry Lewis) is entrusted with a pet monkey, owned by movie star Yvonne Yvonne (Corinne Calvet). There's a contretemps with gangsters and a kidnapping before a happy ending can be realized.