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 on Mars.

When the player meets him, he asks the player to equip himself with a pistol, armor, and a flashlight at a nearby locker. He then tests the radio connection before granting them access to the level, and warns the player not to get trigger-happy as civilians are working around the area.

During the demonic invasion, when the player returns to his office, Brooks appears to be dead but has actually been turned into a shotgun-wielding Z-Sec, and the player is forced to kill him. His office can be used to unlock the outside locker containing Machine Gun and a Shotgun.

He seems to be very well known in the Mars City Underground, as his email is found in almost every PDA of all the UAC employees in that area. This is most likely because he's the only one who can permit entry into the Underground.

Trivia

 * If you discharge your pistol when you first receive it, Brooks will flinch and yell at you to be careful.
 * 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.