Randy travels to the forest to retrieve sap from a sacred tree in order to restock his Ninja gadgets, but McFist beats him there and snags the tree for his holiday party. Randy poses as a Ninja Santa to get in to the party and winds up defending himself against a robot snowman and his team of elves.

Randy and Howard join their school's "Wave Slayer" team but as jet ski waxers. When Randy accidently damages the jet ski belonging to the team captain, Buttermaker, moments before their biggest race, he and Howard must step up and find a way to save the race.