An spaceship lands on Earth carrying an alien disguised as a mailbox! Popeye is about to go out to mail Olive a birthday card when he hears a radio announcement that a flying saucer has been sighted over the city. Popeye continues with his task to mail the card, but he does not realize that the mailbox he has just posted Olive's card in is really the flying saucer. The extraterrestrial then tries to kidnap Popeye and Olive Oyl!