In the future, man-made technology will evolve into unstoppable killing machines capable of traveling back in time to murder the unborn. Makes you eyeball your Roomba a little differently, no? Director and co-writer James Cameron's sci-fi opus is so much more than a dark '80s action flick; it holds up as a tense, relentless journey into what could be. So when the internet becomes self-aware and sends Arnold Schwarzenegger to kill us all, well... we can't say we didn't see it coming.