Popeye makes Swee'Pea a small toy ship from a large piece of wood, but the boy promptly discards it as he takes a look at the Navy battleship Popeye is serving on, the USS Pennsyltucky. When Olive leaves the baby in Popeye's care to go shopping, the sailor soon discovers Swee'Pea has escaped from his stroller and has already climbed to the ship's mast. Popeye breaks Swee'Pea's ensuing fall with a lifeboat, but then the baby slides into a cannon's control board, inadvertently causing Popeye to suffer all sorts of punishments from the cannon and its gears. Next, the baby slips out of a porthole and onto the anchor's chain, leading Popeye to yank the huge anchor up - and on top of himself. More mishaps end with Popeye shot like a shell from a cannon, to be left unconscious after a rough fall.