Evil is, if nothing else, opportunistic. The zombie hordes that are overrunning the living on the surface have been noticed by the Darkness. It`s sent out a call, and now the zombies have been bent to its nefarious purposes. The Survivors will have to follow them down into the caves and caverns if they want to make sure the undead menace is eradicated once and for all! Better bring a torch, its going to be dark down there. With the Massive Darkness Crossover expansion for Zombicide: Green Horde, players can use all the characters and enemies from Green Horde in their games of Massive Darkness. It contains 64 cards, comprised of 17 Heroes, five Mobs, two Agents, seven Roaming Monsters, and three Familiars.