They knew the asteroid was coming, but no one expected this. After it was confirmed that the asteroid would collide with Earth, the leaders of humanity secured a deep, underground bunker. Its sole purpose was to house the future of the human race, leaders that would eventually rebuild the planet after the cataclysmic explosion.
The asteroid hit, destroying a large chunk of the planet, presumably wiping out all life on the surface. They were supposed to open the doors of the bunker to a ruined planet, and begin reshaping society on a new Earth. When they finally set foot on the surface, they quickly discovered they were not alone. Mutants stalked the desert wasteland, looking for their next victim, filled with rancor and hostility and what could only be described as… Rage.