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"You are a marine, one of Earth's toughest, hardened in combat and trained for action.[1] Shortly after reporting for duty at the Union Aerospace Corporation's Mars research facility, a massive demonic invasion overwhelms the base, leaving chaos, horror and uncertainty in its wake.

As one of only a few survivors, you must use overwhelming firepower and all of your combat skill to battle through the demon hordes, find out what went wrong and prevent the evil from spreading. Only you stand between Hell and Earth.[2]"

― The Doom Marine description.  [src]

The Marine (aka Doom Marine or the Marine Transfer) is the alternate version of Doom Slayer. He is a marine soldier in the Marine corps, serving as a member of Thomas Kelly platoon before hell broke loose on earth.

A hardened and trained soldier, he serves as the main protagonist of Doom 3 and it BFG edition.



You are a marine, one of Earth's toughest, hardened in combat and trained for action. At one point, you become a member of Thomas Kelly platoon, eventually gaining respect from your commander. However, your service in the marine corps will soon take a major turn with the arrival of Demons in hell.

Doom 3[]

As a Marine in the service of the Union Aerospace Corporation (UAC), you have been assigned to the UAC Mars Base to relieve soldiers whose tours of duty have expired. At least, that's what they told you when they shipped you out.

Arriving on Mars, you start hearing rumors of strange voices echoing throughout the facility. Seemingly impossible mechanical failures have claimed limbs and lives with alarming regularity. And morale is lower than you've seen in war zones, with schizophrenia and other mental illnesses spontaneously manifesting themselves among the Mars Base personnel at a staggeringly high rate.

Could the teleportation experiments being conducted in the bowels of the Delta Labs have something to do with the problems plaguing the base? And what about the rumors of an archaeological dig that has uncovered evidence of an ancient Martian civilization, long lost to an unknown cataclysmic event?

From the conversations you've overheard between your fellow shuttle passengers, Counselor Elliot Swann and his bodyguard Jack Campbell, it seems that the UAC is growing concerned about the reports that are filtering back to Earth. Swann and Campbell have been sent to Mars by the UAC board to confront the research director, Dr. Malcom Betruger, and to get to the bottom of the troubles.

But surely none of that is your concern, right? You're just a grunt. What possible affect could Dr. Betruger's experiments have on you ...?[3]

Recently transferred to Mars, this soldier got more than he asked for when Dr. Betruger betrayed the UAC.[4]

Forced to fend off attacks from zombified former personnel and demons from Hell, the Marine returns to the city of Mars, where Kelly gives him orders to link up with another squad of marines and get a transmission card containing a distress call to the main communications facility to call for reinforcements. Through out this entire progress, he learned that two other member Campbell and Swann have actually survived and are on their way to the communication facility to prevent any messages to be send in order to contain the situation on Mars.

On their way trying to stop the two, the Marine entire squad is wiped out by the demons in the EnPro Plant, despite he managed to retrive the transmission card, he is far long gone to prevent the bulk of equipment at the communications facility being destroyed by Campbell. However, Kelly gives the marine a guide to the backup system, where depending on his choices whether to obey Kelly's orders to send for reinforcements, or accept Swann's argument to keep Mars isolated in order to stop the demons from spreading into further more.

He is told to go for the Delta Labs either by Kelly or Swann, depending on wathever if the message is sent or not.

When he is on his way to the labotary, the marine is contacted by a traitor, Betruger. He wishes to use the reinforcement in order to transport the creatures to earth, if the marine did not send the reinforcement call, Betruger will be the one to do it. Betruger then unsuccessfully attempts to kill the Marine using the toxic gases in the base's recycling facilities. As he arrives in the lab, he learns about the true meaning and nature of the entire teleportation experiment, it was a foil made by Betruger to retrieve specimens with his increasing obsession with the tests, as well as of a xenoarchaeological dig under the surface of Mars.

Inside the labotary, a scientist tells the marine that the invasion began when Betruger took the Soul Cube into the portal at the beginning of the game, depositing it in Hell. The Marine went after and pursuit Betruger through out the maps, but the teleportation pulled him inside of it as he falls to Betruger traps.

Arriving in hell, the marine fight his way through a large number of demons to the Soul Cube, defeating its demonic guardian. He then reinstalled the teleporter equipment left past resreachs experiments and returns to the Delta Labs. However, Betruger reveals that although the main teleporter entrance is destroyed, Hell has already opening a hellmouth that is capable of bringing a millions of demons to Mars. The Marine later find a injured Swann, who tells him that Kelly has possible been working with the demons for the entire time and could've transformated into something worse that they thought to be.

The Marine is given a PDA by Swann, who informs him that Campbell has went after him and the latter will try to escape the facility alone. However, when the Marine catches up with Campbell in the central computer processing sector of the base, Campbell is mortally wounded; before expiring, he says that Kelly has taken Campbell's BFG 9000 weapon.

Sending the Demons back to hell

The Marine CoS.

Being taunted by Kelly demonic voice, the Marine face off with him at the computer center core, revealing Kelly truest form as a cybernetic human grafted onto a tank-like base. With his personal experiences, the marine is able to kill off Kelly and take back the BFG 9000 as proceeding deeper under the Martian surface to Site 3, the archaeological dig site where the Soul Cube was unearthed.

In the end of the line, the Doom Marine confronted the Cyberdemon and defeated it once and for all. After the gruesome fight, he collapsed in a hallway in UAC Mars Base where he was found and rescued.[5]


  • In some versions he is a 'retelling' of the original Doom Marine's story, but set on Mars instead of Phobos.
  • The title "Doom Marine" or "DOOM Marine" first appears as a title for the main player character appears in various material including the Doom RPG website, and the introduction to the Doom 3: BFG Edition manual. Depending on the source the Marine of Resurrection of Evil is a separate character, or the same character (they are both Marine Security but have different ID numbers in their respective campaigns, and generally different appearances, however).
  • Step into the boots of DOOM Marine and experience his adventures for the first time, or all over again. Featuring enhanced versions of DOOM 3, DOOM 3: Resurrection of Evil and the all-new DOOM 3: The Lost Mission, plus the classics DOOM and DOOM II, DOOM 3 BFG Edition is the consummate DOOM experience.[6]Doom RPG is a first-person turn-based role-playing game set in the Doom universe. Developed specifically for your mobile device, you reprise the role of the Doom Marine made famous in the groundbreaking id Software titles Doom, Doom II, and Doom 3. Say goodbye to humdrum mobile gaming and prepare yourself for the return to Mars in a showdown with the legions of Hell![7]
  • Helmet: The standard issue space marine helmet is airtight and durable, while still allowing a wide view area.
  • Flashlight: Pierce the darkness using this high-powered flashlight. Unfortunately, it is quite large and is almost impossible to use while firing.
  • Spare Mags: Keep ammo close at hand. You're going to need it.
  • Air Tanks: Doesn't offer additional protection but allows demons to see their death in your eyes.
  • PDA: Given to you on your first day on Mars. Allows you to read other people's email and hear their personal recordings.



Doom Marine wielding the Chainsaw

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Doom Marine in promotional art for Doom 3

Doom 3 Screenshot 2024-06-26 11.09
Doom 3 Screenshot 2024-06-26 11.11

The Doom Marine in third-person

Doom Marine Doom 3 Screenshot 2024-06-26 1.15


  1. This line mirrors that of the Doom I manual: Doom: The Story So Far: "You're a marine, one of Earth's toughest, hardened in combat and trained for action."
  2. This part mirrors the backstory form Doom II 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. But that's all behind you now. You've quit the military, and are heading home. Your drop pod lands with a crunch.
  3. Doom 3 Strategy Guide, pg
  4. Quake Champions "Doom Marine" suit.
  5. Resurrection of Evil Introduction: The UAC's Mars Research Base suffers a cataclysmic failure during a classified research experiment, resulting in total desctruction of the facility. Only one survivor is located." This is reflected in the Doom II manual when it describes the hero as the 'only survivor': "What they don't talk about so much is that you were the only survivor."
  6. Doom 3:BFG edition manual