Zombicide: Dark Side details the hours preceding the Xenos invasion on the distant planet PK-L7, right before the events of Zombicide: Invader. In this standalone game, players are members of the Green Squad, the sole military unit to survive in the underground tunnels of PK-L7. The Xenos, an alien species, suddenly went mad and attacked from below, killing everyone on sight. The Green Squad fights to survive and warn the surface dwellers of the invasion. The forerunners of the oncoming horde are the Driller Xenos, a subspecies digging galleries for Xenium, a mysterious fuel and PK-L7’s main treasure. Watch your step in the dark, as the lights are fading out!
Zombicide: Dark Side retains the core Zombicide mechanics and introduces new ones, with special rules for holes and dark Zones, futuristic weapons, and new combat rules. The Green Squad also comes with war machines, in the form of a Vindicator Bot and a Maul Sentry Gun (with different designs and rules than those found in Zombicide: Invader).