When Mike finds out that his best friend, Alex, is a Gris-Kwok and can turn into any animal he chooses, it's the start of some crazy adventures!
Alex's naughty little sister, Polly, is a Gris-Kwok, too, and she won't do as she's told. Mike and Alex are in for the worst babysitting job in the world as they try to keep up with her!
