Lieutenant Lisa was a female Human Starfleet officer who lived during the mid-23rd century. She served in the operations division aboard the USS Enterprise under Captain James T. Kirk, during a historic five-year mission that the Enterprise was undertaking. She was assigned as one of the ship's communications officer in 2269. Lisa was played by Barbara Baldavin, who had previously played Angela Martine in "Balance of Terror" and "Shore Leave" . Though referred to as "Lt. Lisa" in dialogue, she was only credited as "communications officer."