Arnold Schwarzenegger from The Terminator...
Arnold is a robot from the future, created by Skynet, for one purpose, and that is to go back in time and kill the person who would start a human revolution against the robots and the robot utopia that Skynet plans to build.
Skynet was created to become something of a deterrent for any terrorist attacks and is supposed to be a network for the military, until it became self-aware and decided it hates humans.
So, the Terminator is created to terminate the people who would give them trouble in the future, thus ending any chances of humans ever living to thwart their attempts of taking the world for themselves.
Image Credit » http://pixabay.com/en/robots-terminator-mechanical-cyborg-454474/