When Leo finds a strange creature in his backyard, they immediately strike up a relationship However, this is no ordinary creature; he eats pizza with green peas and ketchup, munches on dirty socks, and appears to be from another planet Leo and his new friend have lots of fun together; they play games, ride bike, and go on picnics What will Mom and Dad say if they find out his new friend isn't who they think he is? Will Leo be able to keep him as his new pet?