Who's Afraid Of Mordros The Annihilator? Gretel Grant-Gomez and her pet hamster, “Hamster,” are given superpowers by aliens and the big responsibility of being “Heroes on Earth!” Gretel’s teen brother, Kevin, on the other hand, was overlooked by the aliens, and is stuck being “superhero adjacent.” However, he is often the brains behind each mission! Now, Hamster & Gretel must save the world from one supervillain after another, all while keeping their identities a secret!