Hikaru Sulu was a Human Starfleet officer in the 23rd century. He served as the physicist and helmsman aboard the USS Enterprise under Captain James T. Kirk during its historic five-year mission and later as helmsman aboard theUSS Enterprise-A. He was later promoted to captain and served as the commanding officer of the USS Excelsior. He was widely regarded as a tactical genius, and an expert on Klingon culture and society