Valeris

Valeris is a Vulcan lieutenant and protégée of Spock, the first Vulcan to graduate at the top of her class at Starfleet Academy. In Star Trek VI: The Undiscovered Country she serves as helmsman of the USS Enterprise on its final mission before decommissioning. She is secretly part of the conspiracy of Starfleet, Klingon and Romulan officers seeking to sabotage peace with the Klingon Empire. Unmasked, she undergoes a forced mind meld with Spock that reveals the plotters' names, and is placed under arrest.