For most of Terminator 2 (1991), the villain T-1000 is portrayed as nearly invincible, but a deleted subplot explains why he ultimately lost.
In Terminator (1984), the T-800 interpreted by Arnold schwarzenegger it is extremely tough and almost impossible to defeat. He cannot be negotiated or reasoned with and he is relentless. Furthermore, he is not willing to abandon his mission whatever happens. The T-800 is big, strong, an expert marksman, it can drive any vehicle and it doesn't care how much damage it takes on the way to kill its target. However, two humans, Sarah Connor and Kyle Reese, are able to defeat him. Therefore, for Terminator 2, director James Cameron he realized that the stakes had to be raised. That's where he came up with the new villain, the T-1000 (Robert Patrick).
Made of liquid metal, it was stronger, faster, and with the ability to mimic human behavior and blend in. It also had resistance to receiving damage much greater than that possessed by the T-800. In Terminator 2, Sarah and John have a T-800 on their side, but it's still not a fair fight.
There is a more specific reason why the T-1000 loses in the end. Since a series of deleted scenes made it clear how to end him. Unfortunately, they were cut from the final assembly.
Just before the last act of Terminator 2, in which Sarah, John, and the T-800 mount a final stand against the T-1000, the latter ends up covered in liquid nitrogen. To the clear surprise of the T-1000, it freezes and that is when the T-800 decides to break it into pieces. Unfortunately, the heat from a nearby vat of molten steel defrosts the T-1000, allowing it to reform. It is important to understand that each molecule in the T-1000 is essentially a nano-machine designed to function within the main machine. This is why any destroyed piece will seek out and reunite with its primary mass.
In the deleted scenes from Terminator 2, it is revealed that being frozen inflicted long-term damage on the T-1000 as it is starting to lose control of its transformation capabilities. As it proceeds through the factory in pursuit, the T-1000's hands and feet begin to unintentionally blend into the steel bars and gratings it touches on the road. In the original version of the scene where the T-1000 transforms into Sarah Connor, this flaw was actually what allowed John to identify his real mother, as the fake Sarah's feet had started to melt into the ground.
This is because, as the film's novel explains, the T-1000's main weakness is extreme temperatures.
So when the T-1000 lands on molten steel at the end of Terminator 2, its frenzied transformation is a desperate attempt to try to adapt to the high heat and settle into a form that it can become and escape. However, the temperature is too high, which leads to its eventual disintegration. Why did he seem so surprised by this weakness? It is important to remember that the T-1000 is an advanced and one-of-a-kind prototype, and was recently created by Skynet. It is possible that the machine was not even aware of this particular fault.
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