Doom 3 Walkthrough Mars City

September 12, 2016 (Last Updated: ) | Reading Time: 7 minutes

This Doom 3 walkthrough is divided into 27 total pages.

You can jump to nearby pages of the game using the links above.

Mars City

Doom 3 Walkthrough - Doom 3 106
Doom 3 Walkthrough - Doom 3 106

Sergeant Kelly updates your objectives as you step off the elevator. Defeat this Z-Sector lurking behind the crates.

Doom 3 Walkthrough - Doom 3 107
Doom 3 Walkthrough - Doom 3 107

Head left and a voice summons you from above. This ladder lowers.

Doom 3 Walkthrough - Doom 3 108
Doom 3 Walkthrough - Doom 3 108

Climb the ladder to find Roland. He asks you to go for help and insists on staying put.

Doom 3 Walkthrough - Doom 3 109
Doom 3 Walkthrough - Doom 3 109

Crawl into these shafts. Grab the armor on the left then head right.

Doom 3 Walkthrough - Doom 3 110
Doom 3 Walkthrough - Doom 3 110

Drop into the room below.

Doom 3 Walkthrough - Doom 3 111
Doom 3 Walkthrough - Doom 3 111

As you advance into the room, this zombie emerges behind you.

Doom 3 Walkthrough - Doom 3 112
Doom 3 Walkthrough - Doom 3 112

A second zombie comes at you from the front. Once both are defeated, grab some armor from where the first zombie emerged.

Doom 3 Walkthrough - Doom 3 113
Doom 3 Walkthrough - Doom 3 113

Grab Marcus Stanton's PDA here for some background. You'll learn that a shipment of jackhammers has mistakenly been replaced with a shipment of...chainsaws!

Doom 3 Walkthrough - Doom 3 114
Doom 3 Walkthrough - Doom 3 114

Armor can be found to the left. Grab the medkit seen here on the right before heading through that door ahead. Ready your shotgun.

Doom 3 Walkthrough - Doom 3 115
Doom 3 Walkthrough - Doom 3 115

Two Z-Sectors charge through this door. Defeat them and recover the machine gun in case you misssed it in the last level.

Doom 3 Walkthrough - Doom 3 116
Doom 3 Walkthrough - Doom 3 116

Try to access this door on the left and receive a new objective.

Doom 3 Walkthrough - Doom 3 117
Doom 3 Walkthrough - Doom 3 117

Bam! Pass into the next hallway and this Imp pounces onto the window.

Doom 3 Walkthrough - Doom 3 118
Doom 3 Walkthrough - Doom 3 118

There's the keycard you need, along with two clips.

Doom 3 Walkthrough - Doom 3 119
Doom 3 Walkthrough - Doom 3 119

Return to this door and ready your machine gun. Open the door and battle two Z-Sectors waiting on the other side.

Doom 3 Walkthrough - Doom 3 120
Doom 3 Walkthrough - Doom 3 120

Advance to this window for a medkit and to witness a bot taking out these two Z-Sectors.

Doom 3 Walkthrough - Doom 3 121
Doom 3 Walkthrough - Doom 3 121

Pass through a pair of doors on the left and be greeted by this pair of zombies.

Doom 3 Walkthrough - Doom 3 122
Doom 3 Walkthrough - Doom 3 122

Search the area for armor and ammo - and another pair of zombies.

Doom 3 Walkthrough - Doom 3 123
Doom 3 Walkthrough - Doom 3 123

Pass through a set of double-doors and battle your first flaming zombie. Listen to a man radio for help on the other side of this wall -- only to hear him fall victim to one of "them." Creep factor on max for this one. Grab the medkit seen on the left.

Doom 3 Walkthrough - Doom 3 124
Doom 3 Walkthrough - Doom 3 124

Ready your machine gun before passing through the door on the right, where you'll find a trio of Z-Sectors.

Doom 3 Walkthrough - Doom 3 125
Doom 3 Walkthrough - Doom 3 125

Behind you emerges the famous wrench-wielding fat zombie. You'll find armor in the alcove behind him.

Doom 3 Walkthrough - Doom 3 126
Doom 3 Walkthrough - Doom 3 126

Say, "cheese!" Grab the armor from where the Z-Sectors were positioned and this Imp will pop out at you.

Doom 3 Walkthrough - Doom 3 127
Doom 3 Walkthrough - Doom 3 127

Advance farther down the hall and battle two Imps. One emerges from the ceiling, and the other from the room on the right. Dodge their fireballs then rush up for a close blast from your shotgun. Grab a clip from the room on the right then head into the infirmary on the left.

Doom 3 Walkthrough - Doom 3 128
Doom 3 Walkthrough - Doom 3 128

Pick up the PDA of Dr. Mark Caseon. Listen to his audio log, "Patient Attack" to learn the code 347 for storage cabinet 017 seen here on the right. Inside you'll find a clip, armor, a medkit and shells. Note the health terminal on the left wall.

Doom 3 Walkthrough - Doom 3 129
Doom 3 Walkthrough - Doom 3 129

Enter the next room and awaken the crazed patient mentioned in Dr. Caseon's audio log.

Doom 3 Walkthrough - Doom 3 130
Doom 3 Walkthrough - Doom 3 130

Pull back and battle a pair of Z-Sectors.

Doom 3 Walkthrough - Doom 3 131
Doom 3 Walkthrough - Doom 3 131

Enter the room beyond and this flaming zombie will attack as you approach the opposite window. A medkit and an adrenalin hypo are available here. Exit through the door visible behind the zombie and head left. I love the droning music through here.

Doom 3 Walkthrough - Doom 3 132
Doom 3 Walkthrough - Doom 3 132

Duck under the flame and grab the bullets, medkit and shells.

Doom 3 Walkthrough - Doom 3 133
Doom 3 Walkthrough - Doom 3 133

Follow the corridor to this position to find Bill Tyson's PDA and learn the code 584 for the storage locker in Marine Command.

Doom 3 Walkthrough - Doom 3 134
Doom 3 Walkthrough - Doom 3 134

Backtrack past the infirmary and witness this zombie attack.

Doom 3 Walkthrough - Doom 3 135
Doom 3 Walkthrough - Doom 3 135

Advance to the Marine Comm Center for a video linkup with Sergeant Kelly. He updates your security clearance and gives you a new objective: head to Alpha Labs Administration.

Doom 3 Walkthrough - Doom 3 136
Doom 3 Walkthrough - Doom 3 136

Ready your shotgun and head through here.

Doom 3 Walkthrough - Doom 3 137
Doom 3 Walkthrough - Doom 3 137

Blast this Z-Sector guarding the storage locker.

Doom 3 Walkthrough - Doom 3 138
Doom 3 Walkthrough - Doom 3 138

Unlock the door with the code 584.

Doom 3 Walkthrough - Doom 3 139
Doom 3 Walkthrough - Doom 3 139

Backtrack down the hall, battling this Z-Sector and turning left here.

Doom 3 Walkthrough - Doom 3 140
Doom 3 Walkthrough - Doom 3 140

Your updated security clearance gets you through this door.

Doom 3 Walkthrough - Doom 3 141
Doom 3 Walkthrough - Doom 3 141

Battle more Z-Sectors inside. Step toward operations to find a medkit in the far corner. Return and approach the kitchen door just visible here on the left.

Doom 3 Walkthrough - Doom 3 142
Doom 3 Walkthrough - Doom 3 142

More Z-Sectors are through the kitchen door now seen here on the right, and this Zombie attacks from the alcove visible straight ahead. There's also a medkit at the rear of the alcove.

Doom 3 Walkthrough - Doom 3 143
Doom 3 Walkthrough - Doom 3 143

Enter the kitchen. This zombie is waiting for you by the Super Turkey Turbo Puncher. You can just see the green light of a medkit behind him. Sarge urges you to avail yourself of any sentry bots you find.

Doom 3 Walkthrough - Doom 3 144
Doom 3 Walkthrough - Doom 3 144

More Z-Sectors attack. You'll find armor and ammo to the left.

Doom 3 Walkthrough - Doom 3 145
Doom 3 Walkthrough - Doom 3 145

Exit the kitchen and head left into the restroom.

Doom 3 Walkthrough - Doom 3 146
Doom 3 Walkthrough - Doom 3 146

Brace yourself and take a look in the mirror.

Doom 3 Walkthrough - Doom 3 147
Doom 3 Walkthrough - Doom 3 147

Show the Imp your Marine hospitality. Check the toilets for grossness, if you're so inclined. (Sorry, no screenies.)

Doom 3 Walkthrough - Doom 3 148
Doom 3 Walkthrough - Doom 3 148

Battle another Z-Sector up the hallway to the left, then witness this sentry bot taking out another Z-Sector.

Doom 3 Walkthrough - Doom 3 149
Doom 3 Walkthrough - Doom 3 149

Don't follow the bot just yet. Instead, head right and he'll follow you, taking out this fat zombie.

Doom 3 Walkthrough - Doom 3 150
Doom 3 Walkthrough - Doom 3 150

Hop through this broken window to your left for armor and health. Sarge urges you to hurry.

Doom 3 Walkthrough - Doom 3 151
Doom 3 Walkthrough - Doom 3 151

Now it's time to follow the bot. Don't be in a rush to keep up with him, though. He'll clear out the area ahead of you and return if you stray. Plus, there's plenty of supplies to be had along the way, including a medkit in this room.

Doom 3 Walkthrough - Doom 3 152
Doom 3 Walkthrough - Doom 3 152

Follow the bot to this large battle. Note the airborne barrel just thrown by the Imp on the balcony.

Doom 3 Walkthrough - Doom 3 153
Doom 3 Walkthrough - Doom 3 153

Check your six as more Imps come charging in behind you.

Doom 3 Walkthrough - Doom 3 154
Doom 3 Walkthrough - Doom 3 154

The bot shuts down -- you've arrived at the Administration elevator. Don't head into the lift just yet, though. Instead, crawl into that shaft ahead and climb the ladder beyond.

Doom 3 Walkthrough - Doom 3 155
Doom 3 Walkthrough - Doom 3 155

You'll find armor and shells to the right as you emerge. Pick up Duncan Mathews' PDA and update your security clearance. Return below and enter the Administration elevator visible here.

Doom 3 Walkthrough - Doom 3 156
Doom 3 Walkthrough - Doom 3 156

Activate this panel to end the level.

More Doom 3 Walkthroughs

This Doom 3 walkthrough is divided into 27 total pages.

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