Lieutenant Valeris was a Starfleet officer who served as helm officer aboard the USS Enterprise-A, during its mission to escort the Klingon Chancellor to Earth in 2293. In that capacity, she was a key participant in a conspiracy to sabotage peace talks between the Klingon Empire and the Federation.Prior to her assignment to the Enterprise, Valeris was mentored by Captain Spock at Starfleet Academy, and became the first Vulcan to graduate at the top of her class. So impressed was Spock that, upon being reunited with her aboard the Enterprise, he informed her of his intentions to retire subsequent to the completion of their mission, and of his desire that she should fulfill his role aboard the ship.