Cast
- Groucho Marx as Detective Sam Grunion - Narrator of the Story
- Harpo Marx as Harpo
- Chico Marx as Faustino the Great
- Ilona Massey as Madame Egelichi
- Vera-Ellen as Maggie Phillips
- Marion Hutton as Bunny Dolan
- Raymond Burr as Alphonse Zoto
- Melville Cooper as Throckmorton
- Bruce Gordon as Hannibal Zoto
- Leon Belasco as Mr. Lyons
Crew
- David Miller · Director
- Frank Tashlin · Writer
- Mac Benoff · Writer
- Harpo Marx · Writer
- Lester Cowan · Producer
- Ann Ronell · Composer
- William C. Mellor · Cinematographer
- Albrecht Joseph · Editor
- Basil Wrangell · Editor