DOOM immerses players in a fierce battle between legions of demons, controlled by one invader player, and a cooperative team of up to four marines. The game guides players through two cohesive operations, during which the marines strive to achieve objectives like restoring power to the Union Aerospace Corporation’s facilities or manning expeditions right down into the pits of Hell. Meanwhile, the invader commands their demons to slaughter the soldiers time and time again in an attempt to protect their fiery domain and destroy all of humanity.