Originally, the robot movie was supposed to end with John Connor (Christian Bale) dying from his wounds. Connor’s wife, Kate (Bryce Dallas Howard) suggests that parts of Marcus and Connor be pieced tighter, and a cybernetic, Frankenstein human is created. Then things get hairy. “Connor” goes on a rampage and shoots everyone he loves. McG dives in deeper on what was supposed to happen: “Connor dies… and Marcus offers his physical body, so Connor’s exterior is put on top of his machine body.
It looks like Connor, but it’s really Marcus underneath. And all of the characters we care about (Kyle Reese, Connor’s wife Kate, etc.) are brought into the room to see him and they think it’s Connor,” explained McG. “Connor gets up and then there’s a small flicker of red in his eyes and he shoots Kate, he shoots Kyle, he shoots everybody in the room. Fade to black. End of movie. Skynet wins. F— you!”