The wave reaches into a old Martian portal (probably, the original one who brought the demons on Mars centuries ago) and activates it. The Marine, upon touching the Artifact, awakens it and unleashes a blast energy wave, killing his team. The search team breaks into the chamber, finding a strange artifact - which the Martians sealed away millenia ago.

On Friday March 17, 2147, the Marine and his team were sent by the archeologist scientist Viktor Kharkov to investigate a hidden chamber deep within Mars, beneath the Erebus Labs complex, with the supervision of McNeil. The player now takes control of a combat engineer marine, he is older than the original Doom 3's protagonist. Once more, strange occurrences haunt the facility. McNeil's main objective was to continue the experiments on Mars and discover what Betruger unleashed. Elizabeth McNeil, a ex-colleague of Betruger, who had transferred off Mars days before the outbreak and was the original one who requested Councilor Swann's presence on Mars. Months later, on Monday August 8, 2146, the UAC board of directors announced the renewal of the Mars program, now led by Dr. On Sunday May 1, 2146, an orbital probe recorded a faint unidentified signal broadcast from the abandoned Mars Site 1 complex. Malcolm Betruger, the chief scientist of Delta Labs who - unknown to them - had become a demon named Maledict.

The marine team had no information regarding the fate of Dr. Master Sergeant Thomas Kelly and other Delta Labs scientists were also found dead. Important UAC personnel such the company's lawyer and counselor Elliot Swann and his bodyguard Jack Campbell, who arrived hours before the outbreak to make an assessment of the whole Mars operation and enact damage control if necessary, were found dead. Five days later, on Saturday November 20, 2145, the Recon Zulu marine team found only one survivor, a Marine Corporal.

The invasion led to the total destruction of the facility, with all personnel killed. On Monday November 15, 2145, the UAC Mars Research Base was invaded by the forces of Hell after an experiment with the teleportation technology went wrong.

1.1 ' Interpretations towards the ending.

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