It's hard to grow up in a superhero family when you haven't got your superpower yet! Emily Wilson can't wait to see what her superpower might be. Then she won't be like her little brother, with his imaginary bat and no special powers at all. But when a game of hide-and-seek sends her on an adventure INSIDE a dog (hurray! superpower engaged!), she finds herself on the run from monsters. As she fights to get back home, can she save the day like a superhero should? Can she save the dog? And can she escape that strange tall man who's lurking everywhere? With the combination of her new superpower and Dr. Green's preventive medicine, Emily hopes she can save the dog and save the day. But first, she has to find out how to defeat those monsters ...