 | Groucho Marx als Rufus T. Firefly |
 | Harpo Marx als Pinky |
 | Chico Marx als Chicolini |
 | Zeppo Marx als Bob Roland |
 | Margaret Dumont als Gloria Teasdale |
 | Raquel Torres als Vera Marcal |
 | Louis Calhern als Ambassador Trentino |
 | Edmund Breese als Zander |
 | Leonid Kinskey als Sylvanian Agitator |
 | Charles Middleton als Prosecutor |
 | Edgar Kennedy als Street Vendor |
 | Edward Arnold als Politician (uncredited) |
 | Wade Boteler als Officer at Battle Headquarters (uncredited) |
 | Sidney Bracey als Mrs. Teasdale's Butler (uncredited) |
 | E.H. Calvert als Officer in Battle Sequence (uncredited) |
 | Davison Clark als Minister of Finance #2 (uncredited) |
 | Louise Closser Hale als Reception Guest (uncredited) |
 | Carrie Daumery als Reception Guest (uncredited) |
 | Maude Turner Gordon als Reception Guest (uncredited) |
 | Florence Wix als Reception Guest (uncredited) |
 | Joseph Crehan als Dignitary at Reception (uncredited) |
 | Mario Dominici als Minister (uncredited) |
| Edmund Mortimer als Minister (uncredited) |
 | Charles West als Minister (uncredited) |
 | Verna Hillie als Trentino's Blonde Secretary (uncredited) |
 | Edward LeSaint als Secretary of Labor (uncredited) |
 | George MacQuarrie als First Judge (uncredited) |
 | Frederick Sullivan als Second Judge (uncredited) |
 | Eric Mayne als Third Judge (uncredited) |
 | Edwin Maxwell als Freedonia's Secretary of War #1 (uncredited) |
 | Dennis O'Keefe als Bridegroom at Firefly's Reception (uncredited) |
| Leo Sulky als Agitator (uncredited) |
 | Dale Van Sickel als A Palace Guard (uncredited) |
 | William Worthington als First Minister of Finance (uncredited) |
| Bert Kalmar | Music |
| LeRoy Stone | Editor |
| Herman J. Mankiewicz | Producer |
| Henry Sharp | Director of Photography |
| Leo McCarey | Director |
| Harry Ruby | Music |
| Wiard B. Ihnen | Art Direction |
| Harry Lindgren | Sound Engineer |
| Hans Dreier | Art Direction |
| Edward Dmytryk | Assistant Editor |
| Arthur Johnston | Music |
| Cliff Shirpser | First Assistant Camera |
| John Leipold | Original Music Composer |
| Dale Van Sickel | Stunts |
| Harry Ruby | Story |
| Arthur Sheekman | Additional Dialogue |
| Bert Kalmar | Story |
| Nat Perrin | Additional Dialogue |
| Harry Ruby | Lyricist |
| Bert Kalmar | Lyricist |
| Bert Kalmar | Writer |
| Harry Ruby | Writer |
| Arthur Sheekman | Writer |
| Nat Perrin | Writer |
