Biff Tannen
Biff Tannen played by Thomas F. Wilson in the “Back to the Future” film franchise, was dumb as a post and an insane bully. He tried assaulting Marty’s mom in 1955. Then in the second film, he discovered the Delorean and went back in time to alter the future in his favor. And if that wasn’t bad enough, his ancestor in the Old West was just as bad in the third film.