A group of struggling performers in a New York theater troupe is desperately trying to prepare for their big break. Their efforts are complicated by financial troubles and the fact that one of the performers, Harpo, inadvertently gets mixed up with stolen jewels. The jewels were originally hidden in a can of sardines that Harpo stumbles upon, unwittingly becoming the target of a gang of thieves determined to recover their loot. Led by the intimidating Madame Egilichi, the thieves relentlessly pursue Harpo, making life increasingly complicated for the theater troupe.

As the chaos ensues, Harpo's fellow performers, including the wisecracking Groucho and the resourceful Chico, mobilize to protect him and keep the show on track. Their misadventures lead to a series of comedic escapades involving mistaken identities, narrow escapes, and slapstick humor typical of their style. Meanwhile, the troop prepares for their climactic performance, hoping to impress a visiting Broadway producer who could change their fates. With mounting pressures and escalating antics, the performers must navigate through a wild mix of high-stakes chases and hilarious misunderstandings to save both their friend and their dream.