name some of the cast from it?
Arnold Schwarzenegger, Linda Hamilton and Michael Biehn.
The Terminator
 It stars Arnold Schwarzenegger as the Terminator, a cyborg assassin sent back in time from 2029 to 1984 to kill Sarah Connor (Linda Hamilton), whose son will one day become a savior against machines in a post-apocalyptic future.
where did the idea for terminator come from Inspired by director John Carpenter, who had made the slasher film "Halloween" (1978) on a low budget, Cameron used the dream as a "launching pad" to write a slasher-style film.
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The Terminator [SEP] Introduction
The Terminator is a 1984 American science fiction film directed by James Cameron. It stars Arnold Schwarzenegger as the Terminator, a cyborg assassin sent back in time from 2029 to 1984 to kill Sarah Connor (Linda Hamilton), whose son will one day become a savior against machines in a post-apocalyptic future. Michael Biehn plays Kyle Reese, a soldier sent back in time to protect Sarah. The screenplay is credited to Cameron and producer Gale Anne Hurd, while co-writer William Wisher Jr. received a credit for additional dialogue. Executive producers John Daly and Derek Gibson of Hemdale Film Corporation were instrumental in financing and production.