T-1000

The T-1000, also known as a Prototype Series 1000 Terminator, is a fictional shapeshifting android assassin, serving as the primary antagonist in Terminator 2: Judgment Day, as well as a minor antagonist in Terminator 2: 3-D Battle Across Time and Terminator Genisys. A similar T-1000 Terminator appears in the 2007/08 FOX television series, Terminator: The Sarah Connor Chronicles, where it is referred to as a "T-1001".

Created by the franchise's long-running antagonist, Skynet, the T-1000 is described in Terminator 2 as being composed of a mimetic polyalloy (nanorobotics), whose body is composed of liquid metal that allows it to assume the form of other objects (commonly knives and stabbing weapons) or people, typically terminated victims. Therefore, it is portrayed by multiple actors in the film. It is further explained in the prologue of the film's novelization, that the T-1000 was created through nanotechnology, and is a 'Nanomorph', able to scan the molecular structure of whatever it is touching and visually mimic it.