Milo builds his own haunted house out of a decommissioned old truck and invites his friends to the fright fest, but Zack is not too amused because he's grown out of being scared on halloween, but thanks to Murphy's Law and the truck going on a wild ride throughout town, Zack slowly changes his mind. Meanwhile Dakota and Cavendish take in on the halloween fun while also investigating the mystery of the last halloween, which not surprisingly happens because of them, actually Dakota, and a wayward time grenade.