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Biff Tannen was an old man (now in a wheelchair). He found Doctor Jules Brown, the son of Doc Brown, and got him to invent a time machine. Biff travelled foward in time to the end of the Universe, Biff's cyborg descendant, Griff Tannen VIII, had taken over Hill Valley after killing Mayor Goldie Wilson XII. Biff was accidentally killed by Griff VIII, meaning Griff never existed.