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


Mars Base is the home of some of UAC's radioactive waste facilities.

This is were the Marine of Doom 1 was stationed after he was sent to Mars after attacking an officer on Earth. He spent some three years there before being deployed to Phobos to stop an invasion there.[1]

In Doom 2 the backstory is that the Marine or a Marine stopped an invasion of Mars Base before flying back home in a drop pod on shore leave. He was the only survivor. Only to discover Earth was invaded. This parallels the plot of Doom 3 (and Doom RPG).[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.

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.