An Enterprise security guard who accompanied Kirk and Christine Chapel into the caverns of Exo III in 2266 and was thrown into a bottomless chasm by the android Ruk.
Matthews is a security crewman in the episode What Are Little Girls Made Of?. When Dr Roger Korby's assistant fails to meet the landing party at the cavern entrance on Exo III, Kirk calls down two guards, Matthews and Rayburn, as a precaution.
Rayburn is left at the entrance while Matthews follows Kirk, Chapel and Dr Brown along a narrow ledge beside a deep pit. He falls behind, and a cry is heard as he plunges into the chasm. Brown calls it an accident, but the towering android Ruk is glimpsed withdrawing from the spot.
His death is one of the first signs that Korby's underground refuge is not what it seems. He was played by the stuntman Vince Deadrick.