Ned's Declassified School Survival Guide — Guide to: Halloween & Vampires, Ghosts, Werewolves, and Zombies
The kids set up a Halloween party at Polk, and Principal Pal is thought to be dead after he enters the haunted hall.
Polk becomes a Halloween nightmare, where Ned is a vampire, Cookie is a werewolf, Moze is a ghost, and Gordy is a zombie.