Designed as security forces, the Sentry Robots guard the Cygnus. When the crew tried to commit mutiny, Reinhardt had them capture them and be turned into humanoid robots.
They also spend time in a room where they practice their laser shooting. The prototype and captain of the Sentry Robots S.T.A.R. was the sharpest shooter on the ship.
Two Sentry Robots caught V.I.N.CENT and B.O.B. nosing around in the hospital and were destroyed. Their bodies were soon found and Reinhardt gave the order to destory the Palonimo Crew. Fortunately when the Cygnus started to tear apart inside the black hole, the Sentry Robots went with her.
- The appearance of the Sentry Robots seem to share the resemblance to the Stormtroopers armor and their heads share a fair similarity to Darth Vader's helmet. Another similarity to Stormtroopers is that the Sentries are fodder and they can barely hit anything - sans B.O.B..