James Cameron says that Arnold Schwarzenegger will play the human basis for the T-800 in Terminator 6.
The scene cast Arnold as Sgt. William Candy, the man selected to be the physical basis for the T-800.
The idea of Schwarzenegger serving as the human basis for the T-800’s appearance was actually first toyed with in a scene originally intended to be part of Terminator 3, albeit in a joking way.
In fact, it was arguably Arnold’s portrayal of the titular villain in Cameron’s original 1984 Terminator film that cemented his rise to the A-list of Hollywood.