Try to survive the original 3 episodes of the phenomenon USA Today called "...the most gripping computer game to date." You're a space Marine armed with a mere pistol. Your mission is to locate more substantial firepower, then blast your way through 27 level of the most explosive, demon-laden action ever! -Face off against Cyber-organic mongrels, stampeding demons and ruthless, undead Marines. -Take down the hell scum with an array of weapons, including chain guns, plasma guns and rocket launchers. -Blast to freedom through artistically rendered environments and totally immersive sound effects.