King of Tokyo: Halloween е разширение за King of Tokyo, което добавя две нови чудовища към базоваа игра. Разширението е съвместимо с Power Up, защото пристига с карти с еволюции за новите чудовища. Освен това в Halloween получавате комплект оранжеви зарове и 12 нови карти с умения, които представляват костюми. Те имат силни ефекти, но могат да бъдат отмъкнати от останалите чудовища по всяко време!

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King of Tokyo: Halloween, which is subtitled "Collector Pack 1", includes two new monsters for use with the King of Tokyo base game: Pumpkin Jack and Boogie Woogie.

What's more, each monster comes with its own set of eight Evolution cards – first introduced in King of Tokyo: Power Up! – so that each monster can mutate into an even more nightmarish version of itself! King of Tokyo: Halloween also includes six orange-and-black engraved dice (to fit the Halloween theme, of course) and twelve new Power cards to be shuffled into the deck.

These cards are all Costumes, a new type of card that provides a powerful effect, but which can be stolen by any monster that rolls three claws and rips the costume off of you.