Imperial Sentry Droids were utilized by the Galactic Empire aboard its Imperial Cargo Ships. Should one of the activated sentry droids fall under attack, the remaining deactivated droids would power on.
It is unknown when the Imperial Sentry Droids went into service, though AP-5 was aware of their existence prior to joining the Rebellion. The Ghost Crew, Hondo Ohnaka, Azmorigan, and Melch later encountered several Sentry Droids aboard a cargo ship abandoned over planet Wynkahthu. One droid took Azmorigan and Zeb captive, and its compatriots were activated when Azmorigan foolishly attacked it with a blaster. The Sentry Droids attempted to eliminate the thieves as they were fleeing the ship, but failed and were lost with the vessel when it fell into Wynkahthu's storms.
- The Imperial Sentry Droids were inspired by the Dark Troopers seen in the Star Wars Legends video game Star Wars: Dark Forces.