Considered by many to be one of the best action/sci-fi films ever, Terminator, was really the break through movie for actor turned governor Arnold Schwarzenegger.
Sent back to the year 1984 to assassinate the yet to be mother of the leader of the human resistance, the Cyberdyne Systems model 101 has only one purpose: to umm... assassinate the yet to be mother of the human resistance.
In the year 2029, an army of hunter/killer robots created by the artificial intelligence SKYNET brings mankind to the brink of extinction. That is, until John Connor, the son of Sarah Connor (Linda Hamilton) leads the last remnants of humanity in an all out war for survival. SKYNET send a single terminator back through time to prevent Connor's birth. John Connor sends his lieutenant back through time as well to protect his mother and ensure his survival. Lieutenant Kyle Reese was played by Michael Beihn, who would later go on to die in just about every other film he was ever in, including Aliens and The Rock.
The epic battle of man against machine ensues on the streets of Los Angeles. Through the ordeal, Connor and Reese find time to have sex, which in turn leads to John Connor's birth; truly a paradoxical scenario of such proportions that it would make even a terminator's head feel like it was crushed in a hydraulic press, which happens to be exactly how the terminator is destroyed.
Terminator makes up a third of the trifecta of 80s sci-fi awesomeness, flanked by the films Aliens and Predator. If you've not seen it, and the sequel Terminator 2: Judgement Day, which is arguably even better, there is something severely wrong with you.