T-X (Terminatrix) is a gynoid from the Terminator films and the main antagonist in Terminator 3: Rise of the Machines. She is portrayed by Kristanna Loken.
In 2032, the T-X was battle-tested by Skynet against several other Terminators and by Skynet itself. The T-1002 engaged the Terminatrix in hand to hand combat in the Skynet Central Core, using its mimetic polyally components to develop stabbing weapons all across its body. The T-X was able to gain the advantage through a combination attack utilizing her internal buzz saw to remove the spikes and later destroyed T-1002 with a direct impact from her plasma cannon.
The Terminatrix arrived on July 24, 2004, in a clothes shop with mannequins, melting them and a glass frame on arrival. After assuming the form of a nude woman, it walked out of the shop and approached a confused woman, admiring her car before killing her and taking her belongings. The Terminatrix then went on to killing any of John Connor's future lieutenants, including Kate Brewster and her father Robert Brewster. However, when she coincidentally found Connor, who had been formerly untraceable due to the "living off the grid", she made him her priority target.
At the Cyber Research Systems facility, the Terminatrix injected nanobots into the T-1s to have them protect Skynet the moment it got control of the entire U.S. defense grid. It then killed Robert before going after John and Kate. They managed to trap her in a particle accelerator before going to Crystal Peak, where they were told Skynet's central core was located.
The Terminatrix broke free of the accelerator and followed them, losing most of its polyalloy skin and half its lower body in the process. She grabbed John, determinated to complete her mission but a T-850 unit sent by Kate from the future destroyed them both with its remaining hydrogen fuel cell with a remark of "you are terminated." Despite the T-X's destruction, she has succeeded into helping Skynet become sentient to declare war on mankind, thus Judgement Day has finally occurred.