S.T.A.R.

S.T.A.R. (also known as Special Troops/Arms Regiment) was the prototype and captain of the Sentry Robots who appeared in The Black Hole

Background
According to B.O.B. he was Hans Reinhardt's number one until he built Maximilian and now commands the Sentry Robots.

V.I.N.CENT first meets S.T.A.R. with other robots playing shooting range. He was known to be a sharpshooter, B.O.B. once went against him in a game and beat him. He got so upset that he blew a fuse but also had his revenge by doing terrible harsh things to B.O.B.

He went against B.O.B. again only this time he cheated by bumping him allowing him to win. V.I.N.CENT then stepped forward to challenge him and won. At the same time he shot S.T.A.R. in the chest. S.T.A.R. became so furious over losing he once again blew a few as V.I.N.CENT mentioned he cannot stand a Sore Loser.