But Back to the Future screenwriter Bob Gale would eventually peel the curtain back on Doc's life, revealing that he worked on the Manhattan Project — which added a very dark element to the ...

Gale looked at the kid and said, ‘Doc Brown does not drive a f***ing Mustang.’" The Tiny Tweak to Back to the Future's Ending That Made the Film's Final Twist Work Perfectly Back to the Future's ...