Tom & Jerry (Gene Deitch era) S01E05 - Mouse into Space

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.