In the office of Mr. Lee, a talent agent, Zeppo bursts through the door, proclaiming to be a great musical actor. He gives a terrible impression of Maurice Chevallier. Chico arrives, also proclaiming to be a great musical talent, and gives an even worse impression of the same musical act. This is followed by Groucho and finally Harpo, all adding to the growing confusion in the office.

Four stowaways get mixed up with gangsters while running riot on an ocean liner.

In post-war Casablanca, Ronald Kornblow is hired to run a hotel whose previous managers have all wound up being murdered. French soldier Pierre suspects the involvement of ex-Nazis, specifically Count Pfefferman (in reality, the notorious Heinrich Stubel). Pierre is accused of collaborating with the enemy and attempts to clear his name with the help of his girlfriend Annette and cagey buddy Corbaccio. They enlist the aid of Pfefferman's beleaguered mute valet, Rusty, and discover a hoard of war booty the Nazis have stashed in the hotel.

A detective is hired to protect the life of a singer, who has recently inherited a department store, from the store's crooked manager.