Jerry, tired of Tom's repeated attempts to harm him, gets mad and leaves the house to join a space program. Tom tries to convince Jerry to stay, but to no avail. While Jerry is tested for the space program, Tom becomes so distraught that he becomes an old alcoholic. However, he falls asleep in a large hose that then gets used to fill a rocket Jerry is in with rocket fuel. Miraculously, he survives, and climbs the outside of the rocket to find Jerry in the nose capsule. He proceeds to torment Jerry by spinning him in his sphere-shaped cockpit, but his success is short-lived when he accidentally steps on a button that ejects him into outer space. After brief encounters with a Soviet rocket with a bulldog inside and an asteroid field, Tom returns to Earth, soon followed by Jerry.

The two then return to the house where the cartoon began, with Jerry now wearing a rocket-shaped badge. Tom places a lighter to the rocket badge, and it takes flight. Jerry then uses the rocket-shaped badge as a jet pack to chase after Tom. Tom then packs his belongings and leaves while Jerry waves good-bye to him, as the camera closes into Jerry's face, showing the episode's opening template, closing the cartoon.