The T-X is the primary antagonist in the 2003 science fiction action film "Terminator 3: Rise of the Machines", directed by Jonathan Mostow. The character is portrayed by American actress Kristanna Loken.

The T-X is an advanced and highly intelligent Terminator sent back in time by Skynet to eliminate key members of the human resistance before they can lead a successful uprising against the machines. The T-X is equipped with a variety of deadly weapons and abilities, including a plasma cannon, a flamethrower, and the ability to control other machines. It is also able to mimic human behavior, allowing it to blend in and avoid detection.

Throughout the film, the T-X relentlessly pursues John Connor (played by Nick Stahl) and his future wife, Kate Brewster (played by Claire Danes), who are the targets of the T-X's mission. Despite the efforts of a reprogrammed T-800 Terminator (played by Arnold Schwarzenegger) to protect them, the T-X proves to be a formidable foe and nearly succeeds in carrying out its mission.

The T-X is depicted as a highly skilled and ruthless killing machine, capable of adapting to any situation and overcoming obstacles in its path. Its ultimate goal is to ensure the success of Skynet's plans for domination over humanity.

The character of the T-X was praised by critics for its menacing presence and advanced technological capabilities. Kristanna Loken's performance as the T-X was also widely praised, with many critics noting her physicality and ability to convey a sense of danger and menace without speaking a word.