id Software's terrifying battle with the forces of Hell. A massive demonic invasion has overwhelmed the UAC's Mars Research Facility leaving only chaos and horror in its wake. As one of only a few survivors, players must struggle with shock, fear, and an all-out assault on their senses as they fight their way to Hell and back, in an epic clash against pure evil. Built on id's revolutionary new 3D technology, DOOM 3 is a terrifying battle with the forces of Hell. In DOOM 3, your recent assignment to the Union Aerospace Corporation's Mars research facility seemed simple enough, until their discoveries and experiments unlocked the gates to Hell itself. Now, in an epic clash against pure evil you must fight to understand who is with you, who is against you, and what must be done to stop this nightmare from reaching earth.