Farnsworth and Dr. Schlenna, two producers who are planning a benefit extravaganza, want Dinah Shore, a singer on Eddie Cantor's radio show, to appear in their benefit, but they must first make a deal with Cantor, who holds her contract.  Farnsworth fears that Cantor will want to interfere in the production in exchange for Dinah's participation.

Meanwhile, outside the Hollywood studio, aspiring actor Joe Simpson gathers a group of tourists for a tour of stars' homes.  Although a talented dramatic actor, Joe is unable to find work because he so closely resembles Cantor that people start to laugh as soon as they see him.  While Joe waits for one last customer, songwriter Pat Dixon demands her money back from Barney Jackson, a talent agent who had promised to sell her song.

When Jackson makes his escape in a taxi, Pat jumps on Joe's bus, mistaking it for another taxi, and realizes the truth too late to get off.  After Joe learns of Pat's problems, he offers her a place to stay in the Gower Gulch studio area where his friends, all aspiring entertainers, have built houses out of old movie sets.  Among the group are Spike Jones and his City Slickers, a goofy, energetic band, and Tommy Randolph, a singer.  Tommy, an unknowing victim of Jackson's trickery, believes that he has a contract to sing with Cantor.

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The following day, Tommy arrives at Cantor's home, where Farnsworth and Schlenna are doggedly trying to obtain Dinah's services.  After some confusion, Cantor has Tommy thrown out of his house, and the producers agree to make Cantor chairman of the benefit committee in return for Dinah's appearance in the show.  Despite his promise not to interfere, Cantor makes changes in all the production numbers until Farnsworth, pretending to be a reporter, calls Cantor on the telephone and encourages him to tell his life's story.  When Pat learns about the benefit, she suggests that Tommy crash the performance and sing in front of a professional audience.

With Pat's help, Tommy sneaks backstage, but is once again kicked out by Cantor.  Pat is not defeated, however, and proposes that Joe impersonate Cantor.  A few members of the Gower Gulch gang kidnap Cantor, to the delight of Farnsworth and Schlenna.  They are nonplussed when Joe appears, but as his only demand is that Tommy be allowed to sing, they continue with rehearsals before the man they think is Cantor changes his mind.

After all the stars who have assembled for the show perform, Tommy sings and is such a hit that movie mogul Jack Warner offers to sign him to a contract.  Before the end of the show, Cantor escapes from his captors and returns to the theater, but Joe continues his masquerade and joins the company for the grand finale.