Ethan Mathews

Crewman Ethan Matthews was a Starfleet security officer assigned to the USS Enterprise in 2266.

Before signing aboard the Enterprise, the real Matthews was killed and replaced by a Klingon agent, that was supposed to spy on Captain James T. Kirk and the Enterprise in the build-up to war. Working alongside with Matthews was Edward Rayburn, who was also replaced by an agent. (TOS novel: The Edge of the Sword).

In 2266, Matthews and Rayburn accompanied Captain Kirk and Christine Chapel to the surface of Exo III to ascertain the location of Doctor Roger Korby's archaeological expedition. Both security officers were killed by the android Ruk. (TOS episode: "What Are Little Girls Made Of?").