Commander Beach was a 23rd century operations division Starfleet officer who served aboard the USS Reliant as one of Captain Clark Terrell's bridge officers.
During the early-2280s, Mr. Beach served aboard the starship during Reliant's search for a test planet for Project Genesis, a terraforming experiment which was under the jurisdiction of Dr. Carol Marcus.
In 2285, when the Reliant first entered orbit of what was mistakenly thought to be Ceti Alpha VI, Beach reported from the science station the initial scans of the planet's surface.
Beach would later serve as the duty officer while Captain Terrell and Commander Pavel Chekov were on the surface of what was later determined to be Ceti Alpha V.
He and the remaining crew of the Reliant were stranded on the surface of Ceti Alpha V when Khan Noonien Singh commandeered the vessel. The crew was later saved by the USS Enterprise, following the starship's escape from the Mutara Nebula. (Star Trek II: The Wrath of Khan)
Commander Beach was played by actor Paul Kent.
According to the novelization of the film
, Beach (nicknamed "Stoney") was the ship's helmsman
, a function consistent with his yellow ochre colored uniform seen in the movie.