DOOM

DOOM puts you in the body armor of a space marine in the middle of an inter-dimensional war. Sent into combat at a base on the Martian moon of Phobos, you encounter a demonic horde of invaders pouring through a dimensional rift to challenge the universe. Wave after wave of hideous creatures spread through the base, attacking everything in sight. As you stand among the dead, your duty seems clear; you must eradicate the enemy and find out where they're coming from. When you find out the truth, your sense of reality may be shattered. If you succeed, you will be humanity's hero. Fail, and you will spell its DOOM...