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 & Walkthrough
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. Malcom Betruger. According to Swann, Betruger has overstepped his authority in some way, and Swann and Campbell are there to bring him back into line. You are also on the transport. As a Marine who's been called up to active duty on Mars, your first duty is to report to Marine Command and receive your orders. As soon as the opening cutscene ends, security guard R. Cooper tells you that all new arrivals must be processed at reception.

Follow the walkway to the Security Checkpoint's doorway. You pass M. Caseon, seated on a bench. This disturbing fellow says he needs to get out of here, and he encourages you to do the same. He advises you not to trust anyone. Proceed through the door to the Security Checkpoint, where a technician tells you to stand on one of the red squares on the floor so that he can begin your bio-scan. After the technician successfully performs the scan, the door to the north opens into the Departure Lounge. Go through the door.

You will be brought to the reception desk in a cutscene, and given your PDA. The receptionist will also direct you to Sergeant Kelly and say you need to head directly to the Marine HQ - simply follow the signs. Here in the reception you can also pick up a videodisc containing welcome message. Proceed through the passage on the right, and you will see Swann and Betruger arguing about the working conditions on Mars. Continue down the corridor to the left, going past the bathrooms. On the right are the kitchens, where you can get Adam Berneche's PDA, and/or play Super Turbo Turkey Puncher 3. Past the doors next to the kitchen, you can proceed to Marine HQ. The doors are on the right, and the marine will point you towards Marine HQ. On your way to the HQ you can visit the armory and pick up a videodisc about Plasma Gun.

Upon arriving to the HQ, Segeant Kelly orders you to find a missing scientist named Jonathan Ishii. Then you will be directed to follow the Sentry Bot to the elevator to Mars City Underground, where he was last seen. Follow the Sentry Bot. Near the exit elevator there is a supply cabinet next to the elevator, which you can open by entering the number found in Berneche's PDA's audio log. Enter the elevator to proceed to Mars City Underground: Union Aerospace Subsystems.

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
 * Welcome to Mars Research Facility One: Found behind receptionist
 * Series 3 Plasma Gun Briefing: Found in Combat Prep (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.