The KIWI receive an invitation to a costume ball. Twiki shows a chest full of costumes. Twiki finds a knight armor that he puts on, which makes a terrible rattling noise when he gets moving. Twini dresses up as a fairy. Twiki mocks him but Twini stands up to him and decides to stay in his outfit. And up they go, to the prom. Twiki has trouble moving in his armor. The KIWIs arrive at a castle and knock on the door but nobody comes to open them. The KIWIs are disappointed and leave, bumping into a strange unicorn. It is actually the gorilla, disguised as unicorn, who received the same invitation. The KIWIs and the gorilla actually have fun and exchange their outfits. Twini as a knight, Twiki as a unicorn and the fairy gorilla look so funny that the KIWIs burst into laughter.