Special Halloween edition! Gather around the campfire for the monster mayhem as "Grandpa" Harkes Warlock tells the tale of his first spine-tingling adventure and how the legend of Halloween truly began! Learn how he managed to face the Headless Horseman without losing his head! Then enjoy a bonus "IHM mini" adventure as Will and the gang take you trick-or-treating with a pack of mischievous space gremlins!