Monsters: Attack of the Baby Koalas (4-6p expansion) [18 cards]

Mini-expansion for the first two sets of Monsters and the Things That Destroy Them expands the game up to 6 players by adding four "size-zero" monsters (baby koalas) that grant a powerful ability... but it is unlikely you would save these for final resolution. Also included is a size-13 monster, Invaders from Mars, and a new Tactical card called Duplicator. (In 4-player games, the expansion is optional, but allows players to get 1 extra turn each.)

• 18 cards (6 with backs for The Dark; 6 with backs for The Deep, 6 with backs for The Dead).