Hamster and Gretel The series features siblings the perky Gretel and overprotective older brother Kevin, and Gretel's pet hamster named Hamster. The siblings are to be bestowed super powers by space aliens on their birthdays, but Kevin's powers accidentally go into Hamster instead, and they form the duo of "Hamster and Gretel". Now Kevin must figure out how to work with both Gretel and Hamster to protect their city from mysterious dangers.