Rimworld Zombie Apocalypse is a mod that adds Zombies to the sci-fi colony sim "Rimworld". Zombies are mindless killers who attack anyone, whether friend or foe. They have an infectious bite which is fatal to anyone unlucky enough to let themselves get bitten, and anyone who dies to a zombie bite will be reanimated as a zombie themselves and add to the ranks of the zombie hoard. If that doesn't sound bad enough, in the Zombie Apocalypse incident the zombie virus goes airborne, infecting everybody. Once the virus goes airborne all corpses, regardless of their cause of death, will eventually be reanimated as zombies. These things add up to make zombies an interesting and unique challenge to face in the Rimworld universe.