Terminator 2: Judgment Day (1991)
Arnold returns in the 2nd (and best) installment of the Terminator franchise, but rather than being the baddy, Arnold is the protector of John Conner.
When: 2029 & 1991
Best part: Robert Patrick is perfect as the T-1000. He is creepy, cold, and seemingly unstoppable.
Worst part: T3
Trailer of T2