who played it eventually?
Arnold Schwarzenegger
The Terminator
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.
who did the studio orion originally want to play the t800 in the terminator Sylvester Stallone and Mel Gibson
wiki:19647283
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.