Mars City

"Another Newbie. Welcome to the worst assignment you'll ever have."

- Marak

Mars City is the first level of Doom 3 and consists of a short tutorial on the basic features of the game. The player also picks up the first assignment from Sergeant Kelly ("Sarge"). It is the only level in the game to not include any enemies or weapons. Not to be confused with a later level also based in Mars City after the invasion, Mars City: Union Aerospace Corporate Division.

Summary
The game begins with a short video introducing the Union Aerospace Corporation (UAC), an interplanetary company that operates above and beyond all legal and moral obligations in the development of the most advanced technology known to man.

Following the UAC presentation, the game cuts to a display showing the approach of a transport coming in for a landing on Mars. The shuttle contains Counselor Elliot Swann and his bodyguard, Jack Campbell, who have come to Mars to check up on Dr. Malcolm Betruger. According to Swann, Betruger has overstepped his authority in some way, and Swann and Campbell are there to bring him back into line. The player character, the marine, is also on the transport. His first duty is to report to Marine Command and receive his orders. As soon as the opening cutscene ends, security guard R. Cooper tells him that all new arrivals must check in at Mars City Reception.

The marine follows the walkway to the Security Checkpoint's doorway. He passes M. Caseon, who sits on a bench. This disturbing fellow says he needs to get out of here, and he encourages the marine to do the same. He advises the marine not to trust anyone. The marine proceed through the door to the Security Checkpoint, where a technician tells him to stand on one of the red squares on the floor so that he can begin the marine's bio-scan. After the technician successfully performs the scan, the marine goes through the door to the reception.

The marine will be brought to the reception desk in a cutscene, and given his PDA. The receptionist will also direct him to Sergeant Kelly and say he needs to head directly to the Marine HQ by simply following the signs. The marine proceeds through the passage on the right, and sees Swann and Betruger arguing about the working conditions on Mars. He continues down the corridors and proceeds to Marine HQ.

Upon arriving to the HQ, Sergeant Kelly orders the marine to find a missing scientist named Jonathan Ishii. Then the marine will be ordered to follow a sentry bot to the elevator to Mars City Underground, where the scientist was last seen. The marine follows the sentry bot and enter the elevator to Mars City Underground.

Objectives

 * Report to Marine Command: Speak with Sergeant Kelly in Marine Command HQ.
 * Locate Maintenance Entrance: Follow the Sentry Bot to the Elevator that leads to the Lower Maintenance Levels.

PDAs

 * Personal: Retrieved from Reception.
 * Adam Berneche: Found in Kitchen (right branch past the bathroom).
 * Note: If you spawn a weapon using cheats and kill a character who possesses a PDA, the PDA will appear in your PDA display under the name "Duncan Mathews." If you do this before receiving your personal PDA, it will take your PDA's place.

Video disks

 * Marine Command Briefing. Found from the start in Personal PDA.
 * Welcome to Mars Research Facility One: Found in Mars City Reception, behind the receptionist.
 * Series 3 Plasma Gun Briefing: Found in Combat Preparation (across from Marine HQ).

Emails

 * Welcome Message
 * Report to Marine HQ
 * Safety Awareness Month
 * Code-Black: Missing Staff
 * New High Score!
 * Volunteer to earn extra credits

Characters

 * Doom's protagonist
 * Sergeant Kelly
 * Elliot Swann
 * Jack Campbell
 * Malcolm Betruger
 * Marcus Caseon
 * R. Cooper
 * UAC announcer
 * Miller and Marak
 * Sentry Bot
 * T. Washington
 * A. Chang
 * Slang and Kim
 * E. Grafton
 * S. Holmes
 * V. King
 * H. Feiner
 * R. Kasal
 * K. Lee-Creel
 * J. Yezback
 * K. Tang
 * S.L. Medley
 * D. Morton
 * Joe

Weapons/Items
The only items the player can get on the level are the two bullet clips in the storage cabinet 001. However, other items can be seen, but not obtained, in the armory, the security checkpoint, and in some offices.

The armory contains: The security checkpoint has 4 shotguns and 2 small shell boxes. One of the two offices near the reception contains the ACO keycard, which the player will have to acquire when revisiting the area after the invasion, and the other office contains a large med kit. Another large med kit can be seen in the infirmary.

Storage Cabinets
For the sources of the codes, see Doom 3 locker codes.
 * Storage Cabinet #001 - Supplies: 396. Contains: Bullets (small) x2.