Back to the Future
Griff Tannen, Grandson of Biff Tannen, is a etched-out bully, and a minor antagonist in Back to the Future Part II. He has the ability to grow taller and increase his strength due to technological, cybernetic implants. A newspaper from 2015 implied these implants were illegal, although proposals were around to legalize them. The circumstances of his acquiring the implants remain unknown. He also has his own, customized hoverboard, who he is an expert at with using. Griff was violent and unpredictable, and seemed to have a bit of a comedic and over the top personality. Griff was usually accompanied by his gang of three, Rafe "Data" Unger, Leslie "Spike" O'Malley and Chester "Whitey" Nogura, and was the first Tannen to allow a female into his gang. Not many people stood up to Griff, and he was surprised when Marty McFly, pretending to be his son Marty McFly, Jr., did so.
Griff is portrayed by Thomas F. Wilson who also portrayed Mad Dog Tannen in Back to the Future III.