Mars City

Mars City is the first level of Doom 3 and a 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. The name "Mars City" is also the name of the UAC scientific research colony on Mars, and refers to the base in its entirety.

Location
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.

Mars City Hangar


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 Councillor 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 cinemas end, walk forward and speak to R. Cooper, who 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. Behind Caseon is a control panel with a transfer manifest on it. When you approach it, your reticule changes to a cursor; inspect the items on the manifest: two bins of administrative supplies, several crates of sealed biological specimens, and three metaseal containers of classified material. You can delete any of the items from the manifest if you wish, except the classified metaseal containers. Doing so has no effect on the game. Proceed through the door to the Security Checkpoint. Note that the door has a green light on it indicating that it is unlocked. The door's display panel says "General Access," meaning that anyone can go through it.

Security Checkpoint


Walk into 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 ensures that you're not carrying any dangerous bacteria or pathogens into the facility, the door to the north opens into the Departure Lounge. Go through the door.

PDAs

 * Personal
 * Adam Berneche
 * 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.

Enemies
None

Characters

 * R. Cooper
 * UAC announcer
 * Miller and Marak
 * Joe
 * Sergeant Kelly
 * Councillor Elliot Swann
 * Jack Campbell
 * Malcolm Betruger
 * T. Washington
 * J. Kim
 * R. Slang
 * E. Grafton
 * S. Holmes
 * V. King
 * H. Feiner
 * K. Lee-Creel
 * J. Yezback
 * Marcus Caseon
 * Adam Berneche

Weapons/Items

 * Bullets
 * Sentry Bots
 * Shotgun (not reachable)
 * Machinegun (not reachable)
 * Grenades (not reachable)
 * Pistol (not reachable)
 * Plasma Cell (not reachable)
 * Shells (not reachable)
 * Clips (not reachable)
 * Medkit (not reachable)
 * Security Armor (not reachable)
 * Note: If you use the "noclip" cheat to reach these items, you may take the weapons to use later in the game, giving you an advantage up to Enpro Plant.

Storage Cabinets

 * Storage Cabinet #001: Supplies - 396
 * Mars City Armory: 584 (Note: This door cannot be opened even if the code is entered correctly)

Trivia
At several points in this level can be found soft-drinks vending machines, dispensing Thirsty Burst (whose logo resembles a past 7-Up logo. but the background is yellow rather than green) or Robo Cola (resembling a generic cola logo, with white graphics on a red background).