Newspaper reporter Tim O’Hara finds a crashed alien spaceship that contains one live alien. Not wanting to be discovered by the authorities, the Martian assumes the identity of Tim’s Uncle Martin and begins to repair his spaceship so that he can return to Mars.

Two sailors, Joe (Kelly) and Clarence (Sinatra) have four days shore leave in spend their shore leave trying to get a girl for Clarence. Clarence has his eye on a girl with musical aspirations, and before Joe can stop him, promises to get her an audition with José Iturbi. But the trouble really starts when Joe realizes he’s falling for his buddy’s girl.