A sad Tom tries to convince him to stay putting a hammer, a revolver, and even a bomb on his head, but Jerry ruthlessly ignores him and leaves home, saddening Tom. Jerry enlists as an astro-mouse, and after passing the test he proceeds to the rocket ship.
A disheartened Tom tries to persuade Jerry to stay, but Jerry brutally dismisses him and leaves home, leaving Tom heartbroken. Jerry then enlists in the space program as an astro-mouse and after passing the test, he blasts off into space.