Sergeant Bryce and Corporal Smith take to the air vents in a bid to avoid the monsters roaming the halls. It seems they're almost home free, until a huge, mutated creature arrives and brings a bloodbath! Meanwhile, Bryce and Smith battle the "things" lurking in the vents, until they find themselves in the reactor room. Only problem is Dr. Eisler arrives as well and launches Operation Lazarus! In the action packed climax we discover the full scale of the mad doctor's plans, and which of our heroes will survive their terrifying ordeal.