Mitchell's dad is planning a special Halloween show on radio station WERD, a spooky story about invaders from Mars. Then Mitchell and Stanley find some terrific costumes at a local shop, and offer to help the proprietor organize a Halloween parade in return for letting them use the costumes for Halloween. Little do they know that they're about to get caught up in the weirdest adventure of all. Because some of the people in Eerie aren't really people...