King of Tokyo expansions

Power Up! vs Cthulhu Monster Pack

Short answer: buy Power Up! first. Community pick for first expansion. Halloween's extras include Evolution cards that only work with Power Up!.

Pick Cthulhu Monster Pack first instead if this sounds more like your table: A fun extra monster once you own Power Up!. One reviewer's group dropped the Madness card because it made turns worse for everyone else.

QuestionPower Up!Cthulhu Monster Pack
Our labelBuy this firstDepends on your group
Buy order#1 for King of Tokyo#4 for King of Tokyo
What it addsEvolution cards: a set of special powers for each monster.A new monster (Cthulhu) with Evolution cards, Cultist tiles and Madness tokens; also works with King of New York.
What it fixes——
TypeExpansionMini expansion
Players——
Rules load——
Best for——
You need firstJust the base gameJust the base game
Price guide——
MorePower Up! detailsCthulhu Monster Pack details

See the full King of Tokyo buy order