Jack, a little boy with the uncanny ability to turn into any animal he wants, isn't doing so well these days. He's worried about his parents and their money problems, and he's been feeling sick. Then...

Jack is a typical grade school kid... except that he never speaks a word, is followed everywhere he goes by a flying bug, and can turn into any animal he wants, usually to come to the rescue of his family...

When monkeys and apes all over the world start gathering and behaving in increasingly alarming ways, Jack and his friends must embark on a whirlwind trip around the world to get to the bottom of it all....