Charlie McGuffin tries to be an optimist, but in reality he's a bit of a worrier. Some of the things Charlie is worried about: his brother (who is in hospital); their very panicked parents; unwanted attention from the school bully; the fact that he's started turning into animals! Even though every kid wants a superhero power, Charlie isn't keen on turning into a pigeon in the middle of the school play. But what happens if he does?