You're a space marine armed with a mere pistol. Your mission is to locate more substantial firepower, blow your way through an onslaught of undead marines and mutant demons from hell, and navigate yourself off a radioactive moon base. In order to survive, not only do you have to make it through the first 27 blood-splattered levels of Doom, you also have to get through nine more incredibly tough expert levels in the all-new episode "Thy Flesh Consumed."