Jack the Pumpkin and Boogey Woogey: Here are two new monsters with their set of eight Evolution cards, just like in Power Up! the 1st expansion, each monster can mutate into an even more nightmarish version!

King of Tokyo: Halloween also includes six orange and black engraved dice (to stick to the Halloween theme, of course) and twelve new Power cards that can be shuffled into the base pack. These cards are Costumes: a new type of card that gives a powerful effect, but beware, they can be stolen!