Terminator 1 was the breakthrough role for Arnie, playing an evil human-like robot - with big muscles and a dodgy Austrian accent, obviously - which has been sent back in time to kill the mother of a future resistance leader in the war between humans and computers. A top film which led to a spate of childish incidents at RMAS after its release, involving RMAS Cadets wondering up to their colleagues and saying 'Sarah Connor?' enquiringly in an Austrian accent, and then twatting them. Ah! Little things please little minds.
Terminators 2 and 3 were less good. Arnie's earning power was now such that he could insist on being a 'good' robot sent back in time to protect the resistance leader, etc etc.