Ōban Star-Racers - Season 1 Episode 24 Canaletto's Revenge
Overview: The final race has arrived and the stakes couldn't be higher. Kross, having learned the Ultimate Prize's true nature, goes on a rampage taking down all racers in his path. In the end, all that stands in his way is Molly. When the smoke clears and the race is concluded, a fateful decision by the victor unleashes an evil that should have never been set free.