| Groucho Marx | Dr. Hugo Z. Hackenbush |
| Chico Marx | Tony |
| Harpo Marx | Stuffy |
| Allan Jones | Gil Stewart |
| Maureen O'Sullivan | Judy Standish |
| Margaret Dumont | Emily Upjohn |
| Douglas Dumbrille | J.D. Morgan |
| Sig Ruman | Dr. Leopold X. Steinberg |
Doctor Hugo Hackenbush, Tony, and Stuffy upset a sanitorium, orchestra pit, water carnival and steeplechase.
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