Watch SpongeBob SquarePants: The Legend of Boo-Kini Bottom Full Movie Free Online 123Movies. Tricks and treats strike Bikini Bottom in this haunting stop-motion spectacular! Nothing gives SpongeBob a fright on Halloween night - not even when the Flying Dutchman traps all his friends! Can SpongeBob get some sense scared into him and save his buds from a ghostly fate? Plus, you’ll shake in your square pants with this spooked-out stop-motion special!