This actress played the role of John Connor's step-mother in Terminator 2: Judgement Day. This actress was loaned out by James Cameron to his future wife, Kathryn Bigelow, for Bigelow's first feature film as a solo director, 1987's Near Dark. According to some stories, this actress dressed as a Latina street punk when showing up to audition for her first film role, which she thought was about Mexican immigrants. which in turn prompted a comedic line from John Paxton in that film. Name this actress who played a science officer on the U.S.S. Enterprise (NCC-1701-B) in the film Star Trek: Generations and won a Saturn Award for her big screen debut as Private Vazquez in Aliens.