Professor Leonard discovers an object approaching their house. Later, it turns out that Oscar was sent a message by an old friend from his home planet, who asks him to come to him. When they arrive on the planet, they find out that all the notes on the planet have disappeared and even not a single note comes from any musical instrument. Tommy and his gang will have to find out who is behind the theft of the sheet music.

Professor Leonard invented a device for exchanging feelings. Tommy falls in love with an unknown girl, but Oscar cannot understand what he sees in her. Uncle Leonard calls Tommy and Oscar downstairs to test the invention, but something goes wrong. To his surprise, Leonard discovers that Tommy and Oscar have swapped bodies.