One fine evening at Topangadakota, a giant piranha attacks Ms. Marsu, and Marsu naturally wants revenge on him. Hector immediately sends a radio message to send an environmental expert to them. Benno rickshaw is quickly on the spot and Johnny G. Winner also comes, but unfortunately also prey. Prudently, they all form a team to go in search of the fish. After some trouble, they find the piranha, but they are gradually swallowed up by it. Aunt Diana, who doesn't really understand what's happening, sits down by the river with a ukulele and plays. To their great delight, the big fish appears and starts dancing in the water. In its interior, the swallowed are whirled around quite a bit.