«You're a Space marine…
Disease. An incurable though tangible threat. The demons prowl among the scorched barrens of Mars. Fleets of cacodemons infest every region. Spectres and imps swarming from every crevice. Deep down under Mars' subterra lies UAC's immense labyrinth of superhuman technology. The underground top secret lair of their most horrific experiments, buried in distress.
This is UAC Ultra.» — ReadMe.txt