T-1000 debuted as the main antagonist in the 1991 film, Terminator 2: Judgment Day. The character was originally portrayed by Robert Patrick. The T-1000 Advanced Prototype, also known as the 1000 Series, is a line of android assassins produced by Skynet in 2029. The 1000 Series Terminator is fully autonomous and is made entirely out of a liquid metal called "mimetic polyalloy". This allows it to reform into any shape it touches of the approximate size, thus calling it a "shape-changer". In the future, Skynet is engaged in a war against humans, who are led by John Connor. In Terminator 2, the T-1000 is sent back in time to kill John while he is still a child. T-1000 makes its fighting game debut in 2025 as a DLC character in Mortal Kombat 1. Prior to T-1000's MK1 appearance, Terminator T-800 appeared in Mortal Kombat 11.