Enter, Fistrick! Megawhatts, playful but havoc-wreaking aliens from Ben's past, lead the teen superhero and his new partner, Rook, on a wild chase through downtown Bellwood. But catching them is only the beginning of their challenge as the two plumber agents soon find themselves facing a brand-new dangerous enemy who has anything but fun on his mind. Based on the hit Cartoon Network series Ben 10: Omniverse.