Sentry Bot/Doom 3

"Marine, if you run across any operational Sentry Bots, use them. Those guys pack a lot of firepower."

- Sergeant Kelly



The Sentry Bot is a small, dog-sized security robot, constructed by Mixom Corporation for the UAC. It is used in all places of Mars City in Doom 3, primarily used to escort UAC personnel to a designated location. However, there were many issues with them, as one Sentry Bot suffered from a a system failure, causing it to unintentionally fire at one of the UAC employees. Fortunately, a nearby marine managed to disable it.

A Sentry Bot consists of a robotic "head" walking on four spider-like legs, and equipped with a small, but powerful machine gun and a flashlight. Most Sentry Bots end up being destroyed and dis-repaired after the invasion, save for only a small handful of operational ones scattered throughout Mars City. They are primarily used to escort the player to their intended location, while neutralizing any possible threats to keep them at bay.

Sentry Bots make excellent allies; their standing is about on par with the more elite demons such as the Revenant or Chaingun Commando, and they can easily mow through groups of Z-Sec soldiers or Imps. In Resurrection of Evil, however, they can be overwhelmed and destroyed by multiple Revenants, or by Hell Knights in The Lost Mission. However, in some levels, you can access another Sentry Bot if the current one becomes disabled in combat.

Sentry Bots can harm the player with friendly fire if caught between their line of fire against an enemy. Conversely, Sentry Bots are more prone to being quickly disabled by the player if they carelessly engage fire on them while attacking. As a result, it is advisable not to engage in close combat with enemies when escorted by a Sentry.

Sentry Bots can be found in Mars City, the Enpro Plant, and the Communications Tower. In Resurrection of Evil, they can be found in the Erebus Monorail Station and the Phobos Complex.

Combat details

 * Health: 300
 * Attack Damage: 5 (machine gun)
 * Locations: Mars City, Mars City (Revisited), Enpro Plant: Energy Processing and Storage, Communications, Erebus Level 6, Phobos Lab Sector 3
 * Cheat spawn: "spawn char_sentry" (does not work) / "spawn comm1_Sentry" (working)
 * Flashlight: "spawn comm1_sentry flashlight 1" (Sentry has flashlight on!)