Dr. Colosso is a former supervillain who was turned into a pet bunny by his archenemy Hank Thunderman using Animalizer that Colosso made against himself. He lives with the Thundermans Max's basement and is Max's sarcastic pet bunny and best friend. His son is Balfour Colosso aka The Gamer, Octopusgirl was his prom date, Grapple Girl was his date to evil prom and he currently has a small crush on Barb Thunderman. He used to be part of the villain leauge before being turned into a Bunny.