When Lex and Presley have to head to Shady Pete's Carnival to replace a toy Lex destroyed, they get more than they bargained for when they have to beat him at his own game.

It's Halloween and the kids open a haunted house. They recruit Mad Scientist Fisher to use unorthodox technology to bring a stuffed bear to life. When the evil creature escapes the kids must work together to stop it before it's too late.