3 DooM - Forbidden Secrets of the UAC » This is a full novelization of DooM 1 & 2 written as a sequel to Doom 3. It explores origins of portal technology, how Dr. Kronos becomes a villain, the portal accident and how Hell reaches Earth & Mars. Many unknown factors of the Phobos incident are explored, mysteries of Hell uncovered, and Earth forces overcoming demons featuring Sarge from Quake 3.

3 DooM - The Ultimate Experiment » *I have a different vision for a book 5, this shouldn't be any longer considered cannon for the rest of the books* The marine has arrived on Earth to find it has been invaded by the mysterious alien force. The marine fights to survive and performs a daring rescue, while the UAC continue to operate from a new strategic location, engaging in their most dangerous experiments yet.