Hell on Earth (Doom Series #2)

They were creatures seemingly spawned straight from the pits of Hell—demons, zombies, fire-breathing imps—all too horrifically close to the stuff of nightmare to be real. But they were. And on the inhospitable moons of Mars, Corporal Flynn "Fly" Taggart, Earth's last line of defense against a seemingly inexhaustible supply of alien warriors, beat them back almost single-handedly.

But Taggart discovers that the war had barely begun...for while he was fighting them on Mars, the hellish creat...