The Tenarek was a D7 class battle cruiser that saw service with the Romulan Star Empire during the 23rd century. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era) In 2268, the Tenarek and two other Romulan vessels captured the USS Enterprise. However, the Enterprise was able to escape after James T. Kirk stole the ship's cloaking device and installed it on the Enterprise. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era; TOS: "The Enterprise Incident") In the episode this vessel is unnamed.