Groucho Marx as Ronald Kornblow

Harpo Marx as Rusty

Chico Marx as Corbaccio

Charles Drake as Lt. Pierre Delmar

Lois Collier as Annette

Sig Ruman as Count Pfefferman / Heinrich Stubel

Lisette Verea as Beatrice Rheiner

Lewis L. Russell as Governor

Dan Seymour as Prefect of Police

Frederick Giermann as Kurt

Harro Meller as Emile

David Hoffman as Spy

Paul Harvey as Mr. Smythe

Ruth Roman as Harem Girl (uncredited)

Arthur Tovey as Military Man in Restaurant (uncredited)