When his teacher brings a hamster to school for the class to take care of, Monster Boy gets teased by the other kids about being different and he needs to control his desire to eat the pet.

Marty, a child who has monsters as parents, has difficulty dealing with his differences and the fact he never has enough food to eat for lunch.

Marty Onster's parents want him to be the best monster he can be for Halloween, but Marty does not want to be scary.

When Bart Ully and his friends dare Marty to sled over the jump at the bottom of Breakneck Hill, Marty plays it safe.

The game is on when Miss Steps tells the class it's time for dodge ball during gym class.