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[[image:doom3shot00011.png|thumb|right|256px|Hell is near]]
The protagonist is once again a nameless space marine who holds the rank of Corporal. As it just so happens, he gets shipped to the [[UAC]] Mars research facility with [[Counselor Swann]] and his bodyguard [[Jack Campbell]] on the same day all Hell breaks loose. Within minutes of the invasion, the main military units are zombified by evil souls, and the remaining staff are killed off by the attacking Demons. Only a few scattered squads remain; , mainly Bravo Team being the main one, in which with whom the player trys tries to regroup with for a large part of the game. It is once again upon the player to stop the forces of Hell from reaching Earth.
The first cut scene displays Swann saying how fed up he is to Campbell about being sent to Mars to check security. Swann says to Campbell he is “…tired of doing damage control every time he makes a mess.” Swann is later seen arguing with the head research scientist in Delta Labs, [[Dr. Betruger]], saying there are too many incidents happening throughout the base, along with frightened employees and rumors of what is happening in Delta Labs.
The player's first mission, assigned to him by Master [[Sergeant Kelly]], aka “Sarge”, is to find a missing scientist named [[Jonathan Ishii]] that was said to be seen at the old communications facility. When found, he babbles about sending out a warning - “The Devil is ''real''. I know. I built his cage.” With those words, Hell erupts from the main experimental gateway, sending a shock wave through the complex, along with glowing pentagrams and scores of evil ghost skulls that transform nearly every human into zombies, including Ishii.
=== Later storyline and ending ===
