|For other uses, see Sentry Turret (disambiguation).|
|Vehicles and/or Gadgets||None|
|Residence||Aperture Science Enrichment Center|
Sentry Turrets are miniature tripod robots that appear in every game in the Portal series. They are seen as incapable of independent movement but can open each side of their chassis (their 'arms') horizontally in order to reveal two Gatling guns. The central part of the chassis holds their red-eye, which emits a targeting laser. Almost all of the space within the Turret is devoted to storing the ridiculously stacked ammo, explaining the nearly infinite supply of ammo when firing.
When test subjects are out of sight from the Turret's presence, they will maintain a standby state and will remain motionless with their guns retracted. Moving into their angle of sight, however, will cause Turrets to deploy their guns shortly after greeting the unlucky individual before opening fire. They will continue to fire until the target is dead or moves out of sight. If the latter occurs, Turrets will briefly search for the test subject (as indicated by the movement of the targeting laser), after which they will revert to a standby state.
Turrets can be avoided, disabled or destroyed in a number of ways. The most common method is knocking them over, causing them to flail and fire wildly before deactivating. This can be done by picking them up and dropping them or using any object to tip them over. Additionally, the Discouragement Beams or Emancipation Grills can be used to completely destroy them.
In Portal, Turrets will shoot the glass when the player is on the other side. In Portal 2, however, Turrets will only follow the player behind glass.
Sentry Turrets are placed around the Aperture Science Enrichment Center in various Test Chambers. They are defeated by Thermal Discouragement Beams, a giant coin, and a Locate Keystones involving a Dalek.
Following the defeat of the Tri, Batman, Gandalf, and Wyldstyle ask GLaDOS for help. After she denies and tries to kill them, Sentry Turrets are summoned to shoot them with lasers (confusing Gandalf) only for Wyldstyle to deactivate them.
- In the Portal series, the main Turrets are voiced by Ellen McLain who reprises her role in the game.
- Although the Sentry Turrets are enemies in Portal 2, the vehicle version is friendly. The same goes for the Crabmeat and the Dalek.