Harpo Marx - Himself

Chico Marx - Faustino the Great

Ilona Massey - Mme. Egilichi

Vera-Ellen - Maggie Phillips

Marion Hutton - Bunny Dolan

Raymond Burr - Alphonse Zoto

Bruce Gordon - Hannibal Zoto

Groucho Marx - Detective Sam Grunion

Melville Cooper - Throckmorton

Leon Belasco - Mr. Lyons

Paul Valentine - Mike Johnson

Eric Blore - Mackinaw

Marilyn Monroe - Grunion's Client

Director(s): David Miller

Writer(s): Frank Tashlin Mac Benoff - based on the story by Harpo Marx

Producer(s): Lester Cowan

Cinematography: William Mellor

Editing: Basil Wrangell Al Joseph

Music Director: Paul J. Smith

Art Direction: Gabriel Scognamillo

Special Effects: Howard Anderson

Choreography: Billy Daniel