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UAC Mars Base is a UAC facility located on Mars. It is mentioned in Doom and Doom 2.


Mars Base is the home of some of UAC's radioactive waste facilities. The Marine was stationed there for three years before being deployed to Phobos, where it is invaded by Demons.[1] The Mars base is soon fell under attack where every human being were killed except the Marine, who single-handedly stopped the invasion.[2]

Doom Snes

An image showing Mars shows that a large section of Mars has apparently been colonized.

Doom 3

See also UAC Mars Research Base

See also

Behind the scenes

The manual for Doom II tells of a completely different set of events than occur in both the endings of the original Doom or Ultimate Doom which took place on Phobos and Deimos instead, and lead to the Marine in those games teleporting to Earth through gateways.

Some Fanon believe this to mean that the marines in Doom 1 and Doom 2 are completely different individuals who reached Earth by different means (Mars hero by drop ship, and the Phobos/Deimos marine by teleportation). With one hero having battled on mars and the other battled through Phobos and Deimos instead.

To add to the confusion some of the later manuals and websites also suggest that the marines in Doom 1, 2, 3 (and sometimes those of Resurrection of Evil and Lost Episode) are the same character. At the very least most sources indicate that the marine from Doom and Doom 3 are the same.

It is possible that after arriving on Earth, the marine was sent back to Mars. This would likely mean that Thy flesh consumed took place after his return to Earth on the Dropship and before Doom 2 started, rather than right after Inferno. If the marine from Doom 3 is the same as well than it is possible that Doom 3 is actually telling the story of the marines return to Mars post inferno.

Who knows we but the differences in these characters might have inspired characters such as Doom (character) and Phobos (character), B.J. Blazkowicz III and Stan Blazkowicz as separate characters in Quake and Doom RPG respectively.


  1. Doom I Manual: You're a marine, one of Earth's toughest, hardened in combat and trained for action. Three years ago, you assaulted a superior officer for ordering his soldiers to fire upon civilians. He and his body cast were shipped to Pearl Harbor, while you were transferred to Mars, home of the Union Aerospace Corporation. The UAC is a multi-planetary conglomerate with radioactive waste facilities on Mars and its two moons, Phobos and Deimos. With no action for fifty million miles, your day consisted of suckin' dust and watchin' restricted flicks in the rec room....A few hours ago, Mars received a garbled message from Phobos. "We require immediate military support.
  2. Doom 2 Manual: Back at last. After days of hard fighting in space, you've returned home on well-earned leave. You're one of Earth's crack soldiers, hard-bitten, tough, and heavily-armed. When the alien invasion struck Mars, you were the first on the scene. By killing, killing, and killing, you won. You stopped the invasion, saved Mars base, and became a war hero. What they don't talk about so much is that you were the only survivor.