In the Resurrection of Evil expansion, however, they are sometimes overwhelmed and destroyed by large groups of revenants and require the player's backup in order to survive. Sentry bots make excellent allies their standing is on par with the more elite demons such as the revenant and chaingun commando, and they can easily mow through hordes of Z-Sec soldiers and imps. If you find one still active, it will help you fight the demons. When the demons invade the base, many sentry bots are destroyed. One sentry bot will lead the player to the Mars City Underground elevator. Though utilizing sophisticated artificial intelligence, records of several adverse incidents with the bots can be found in several employees' PDAs, detailing accidental discharge of their weapons, or unexplained rejection of new employees' identification credentials.Īt the beginning of the game they can be seen in the Marine HQ. They were constructed by Mixom Corporation for the UAC. Each sentry bot is equipped with a powerful machine gun and a flashlight. It is employed in all sectors of Mars City in Doom 3. The sentry bot is a small, dog-sized security robot with a prominent head and four highly articulated spider-like legs.

Doom 3 sentry bot