Lieutenant Larry Matson was a male Human Starfleet officer in the 23rd century. He served in the command division aboard the USS Enterprise in 2266 under the command of Captain James T. Kirk, during an historic five-year mission that the starship undertook.
That same year, Matson answered a call in the recreation room from engineering by Kevin Riley, who was attempting to appease his loneliness. He assumed Riley must have done something bad to pull a solo assignment in the engineering room. Matson remained as Lieutenant Uhura sang "Beyond Antares" for Riley. (TOS: "The Conscience of the King")