The T-X, nicknamed the "Terminatrix", is a fictional gynoid assassin. It is the main antagonist in the movie Terminator 3: Rise of the Machines. It was primarily portrayed by Kristanna Loken. The fictional T-X has the ability to assume the appearance of other characters. The T-X's power to take on disguises is related to the shape-shifting T-1000; therefore, several other cast members occasionally portrayed the T-X throughout the film. It draws many parallels with the first female terminator, the I-950 from the novel T2: Infiltrator.