Fourteen-year-old twins Phoebe and Max have everything in common: home, school, a birthday, and even the superpowers they inherited from their parents. But in the cosmic tournament of genetic roulette, it turns out that Phoebe was born good, while Max has been drawn to the side of evil since childhood. The rivalry between two superpowered teens, along with the usual mix of school and family problems that every kid faces, leads to a number of amusing situations.