After days of fighting in space, you've returned to Earth only to find the situation is no better than it was on Mars. In fact, it's worse. The hell-spawned hordes are everywhere.
Billions are dead.
You have to go back in action. Otherwise, humanity is history. Doom 1.17 patch - This patch upgrades Doom2 from version 1.666 to 1.7a. FilePlanet - DOOM 2 section on FilePlanet. Levels, sounds, and more.