It seems that anything is possible once the Professor arrives in town with his colorful and ragged band of rail-riding wayfarers. When the Professor tells Tim about a legendary supernova with mysterious powers that is set to appear in the night sky any day now, Tim knows he'll finally get the dog he's always wanted. After making the wish, Tim realizes something went wrong: he has a fur coat, a wagging tail, a wet nose, and four paws!