Anchorhead said:
...I've always dug the Back To The Future handling of it - he goes back and does start to erase himself.....[etc.]
And then they did something weird in BTTF II.
"2015 Biff" steals the car, and takes the book to 1955....changes the timeline....and then returns to the original 2015.
...
If Doc and Marty couldn't go back to the original 2015 to stop Biff from stealing the book, how come Biff could return himself to 2015?