Nine-year-old Kelly Donovan helped save the world from aliens, but now she has an even bigger problem-someone's trying to ruin Halloween.Life is difficult for the world's tiniest superhero. Her genius plan to save her parents from supervillainy in one easy step proved impossible... at least not without destroying the Earth. Superpowers, good or bad, aren't going away any time soon. Mom's as likely to hug her as trick her into a ridiculous trap, but...