The Past...
Your fatigue was enormous, the price for encountering pure evil. Hell was a place no mortal was meant to experience. Stupid military doctors: their tests and treatments, were of little help. In the end, what did matter - it was classified and sealed. The nightmares continued. Demons, So many Demons; relentless, pouring through

Far Away...
The planetary policy was clear. An absolute quarantine was guaranteed by apocalyptic levels of radiation. The empty dark corridors stand motionless, abandoned. The installations sealed.

The Present
A long forgotten relay satellite barely executing, decayed by years of bombarding neutrons, activated and sends its final message to Earth. The satellite's message was horrific, from the planetary void there came energy signatures unlike anything sampled before.

The classified archives are opened. The military episodes code named "DOOM" were not actually complete. A single entity with vast rejuvenation powers, masked by extreme radiation levels, escaped detection. In it's crippled state, it systematically altered decaying dead carnage back into corrupted living tissue.

The mutations are devastating. The Demons have returned even stronger and more vicious than before. As the only experienced survivor of the DOOM episode, your commission is re-activated. You assignment is clear: MERCILESS EXTERMINATION.