The T-101 - Terminator 2: Judgment Day (1991)

Perhaps the most unlikely swap from villain to hero occurs in Terminator 2: Judgment Day. This time, Schwarzenegger wears leather, cool shades, and rides a Harley Davidson to the rescue of John Connor. He protects John from the more advanced shape-shifting T-1000, which its parent artificial intelligence, Skynet, is more determined to eliminate.

While the T-1000 pursues the Connors, Arnold's T-101 conjures up a risky plan to destroy Skynet before its created. Unlike the original T-101, the newly programmed cyborg has the ability to learn and become more human by learning body language, curse words, and the meaning of life. In the end, he has his allies destroy him to satisfy the greater good, stopping Judgment Day.

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