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However, Skynet, the malevolent artificial intelligence from a post-apocalyptic future, is not finished. It sends back a new, nearly unstoppable killing machine—the T-1000 (Robert Patrick)—to assassinate John Connor. The T-1000 is a prototype made of "mimetic polyalloy," allowing it to shapeshift into any person or object it touches and reform itself after sustaining damage. In response, the human resistance sends back their own protector: a reprogrammed T-800 Terminator (Arnold Schwarzenegger), the same model that was sent to kill Sarah Connor in the first film.