T. Brooks

"Welcome to the dungeon, Marine; most unexciting place on Mars."

- T. Brooks, upon meeting the Marine

T. Brooks is a minor character in Doom 3. He is a Mars-Sec Admin stationed at a security entrance of Mars City Underground.

When the Marine meets him, he asks him to equip himself with a pistol, armor, and a flashlight at a nearby locker. He then tests the radio connection before granting the Marine further access to the area, and warns him not to get trigger-happy as civilians are working around the area. He will also send a quick email to a fellow Mars-Sec personnel, Mark Ryan through PDA to help guide the player to their intended destination.

During the demonic invasion, when the Marine returns to his office, Brooks appears as a Shotgunner Z-Sec, forcing the Marine to kill him. His office can be used to unlock the outside locker containing a Machine Gun and a Shotgun.

Trivia

 * If you discharge your pistol when you first receive it, Brooks will flinch and yell at you to be careful.
 * Brooks seems to be very well known in the Mars City Underground, as he emails almost all the UAC employees in that area through their PDA. This is most likely because he's the only one who can permit entry into the Underground.
 * The Z-Sec of Brooks is actually another Z-Sec already positioned in his office, before the demonic invasion. This can be seen by using the noclip cheat to enter through Brook's office, after he grants the player further access to the level.