Terminator 2Leading Edge Games -- now defunct I believe -- released a series of excellent role playing games based on popular movies. Terminator 2 was adapted into miniatures wargaming rules¸ allowing you to sling it out: Humans versus Terminators and Hunter-Killers.
Strictly speaking¸ this isnt an RPG¸ but it would provide an excellent basis for one. Use the rules set from Traveller: The New Era for a science-based campaign true to the movies. (Ironically¸ the official TNE campaign is based on the appearance of a homicidal computer virus that destroys interstellar civilization!)