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Biff Tannen is Hill Valley's bully, and his family travels through time tormenting the McFlys. He shows up as George's boss in 1985, as an arrogant teen in 1955, as a billionaire in a twisted timeline and as the ancestor Buford in the Old West. Thomas F. Wilson plays him.
In 1985, Biff is George McFly's supervisor and takes advantage of him. In 1955 he was already the school bully, goes after Marty, locks him in the band car's trunk and tries to force himself on Lorraine at the dance. George knocks him out with one punch. In 1985, Biff is waxing George's car.
In 2015, an old Biff overhears Marty and Doc, steals the DeLorean and hands his younger self, in 1955, an almanac of sports results. In the alternate timeline he becomes a millionaire, opens a casino, turns Hill Valley into chaos, kills George in 1973 and marries Lorraine. In 1955, young Biff crashes his car into a manure truck again.
In the Old West, Biff's great-grandfather, Buford "Mad Dog" Tannen, is the gunman who kills Doc in the original timeline. He goes after Marty over an insult and challenges him to a duel by calling him yellow. Marty beats him with help from a stove door and sends him into a manure wagon. Buford and his gang end up arrested for an earlier robbery.
The role went to Thomas F. Wilson in his first starring film part. Per Wikipedia, the name Tannen comes from Ned Tanen, a Universal executive who had been unpleasant to the writers. In Part III, Wilson did his own horse stunts.
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