James Cameron Schwarzenegger also returned in his role as The Terminator, but this time as a protector. Unlike Schwarzenegger's character—the T-800 Terminator which is made of a metal endoskeleton—the new villain of the sequel, called the T-1000, is a more advanced Terminator made of liquid metal, and with polymorphic abilities. The T-1000 would also be much less bulky than the T-800. For the role, Cameron cast Robert Patrick, a sharp contrast to Schwarzenegger. Cameron explained, "I wanted someone who was extremely fast and agile. If the T-800 is a human Panzer tank, then the T-1000 is a Porsche." Cameron had originally wanted
T-1000 also not specifically designed to encounter other Terminators and has little knowledge of their diagnostics. This allows the T-800 to take it by surprise. The T-1000 had previously shut the T-800 down, but did not know of the older model's emergency reboot power mode. It is stated in Terminator 3, the T-X was designed with the knowledge necessary to destroy other Terminators and thus diagnostic files of other Terminators was in its internal database. The Special Edition DVD release of "T:2" contains additional scenes in the steel foundry showing that the damaging effects of being frozen, shattered and thawed caused