The UAC discovers hidden caverns on the dark side of the Moon. Upon exploring through them they come into an ominous hall lined with violet rock and pulsating crystals as lava flows around. At the end of the hall is a beckoning portal. The UAC sends in a research team along with squads of marines. Days have passed since their entry and communications have been lost. The UAC then calls in the DOOM Marine to go in after the team. The DOOM Marine will discover Hells Shadow on the other end of the portal. This SHADOW HELL is powered by the fear of mortals lost in its ethereal grasp. The DOOM Marine will face familiar yet twisted versions of his demonic foes. Now he must find the fate of the research team and find a way out of this dark land. He must traverse treacherous mountains, freighting woods, dark caverns, and much more before the final show down at the Evil Cathedral.
