Plot summary
After finding Kramer in his apartment at all hours in unwelcome situations, Jerry confiscates his spare keys from Kramer. Jerry soon takes pity on Kramer, but Kramer refuses with false bravado, citing the "covenant of the keys". Kramer leaves for California to break into show business, vowing to free himself from Jerry's hospitality, but Newman divulges that Kramer really left out of resentment. Jerry, George, and Elaine all reshuffle custody of their spare keys, but Jerry ends up locked out of his apartment with Elaine and his spare keys nowhere to be found. Kramer has many hitchhiking misadventures on his journey to Los Angeles.
Credits
Adapted from Wikipedia contributors, Seinfeld season 3. HTML formatting and reference markers removed.