Griffin "Griff" Thomas Tannen is the secondary antagonist of the Back to the Future franchise, serving as the secondary antagonist of Back to the Future Part II. He was the grandson of Biff Tannen in 2015, and was very similar to his grandfather at a younger age.

Griffin "Griff" Thomas Tannen is the secondary antagonist of Back to the Future: Part II, the second installment in the Back to the Future trilogy. He is Biff Tannen's future grandson and the bully of Marty McFly Jr. during the year 2015.

Griff Tannen (portrayed by Thomas F. Wilson in both Back to the Future Part II and in the animated series) is the only known grandson of Biff. He is part of a gang that also consists of Rafe "Data" Unger, Leslie "Spike" O'Malley and Chester "Whitey" Noguera.

Griffin "Griff" Thomas Tannen is the secondary antagonist of Back to the Future: Part II, the second installment in the Back to the Future trilogy. He is Biff Tannen's future grandson and the bully of Marty McFly Jr. during the year 2015.

Thomas Francis Wilson Jr. (born April 15, 1959) is an American actor, stand-up comedian, musician, podcaster, and YouTuber. He is best known for playing Biff Tannen, Griff Tannen, and Buford "Mad Dog" Tannen in the Back to the Future film trilogy (1985–1990).

When Marty McFly intervened, he said no and resisted Griff and the gang. This led to a hoverboard chase around Courthouse Square very familiar to old Biff Tannen . They trapped Marty over a manmade lake in front of the courthouse and hooked onto Griff's Pit Bull hoverboard.

Put on a Prison Bus: Griff and his Gang of Bullies are last seen being arrested after their chase against Marty ends with them crashing their hoverboards into the courthouse. The newspaper confirms their arrest.

Griffin Thomas Tannen is the secondary antagonist of Back to the Future: Part II. He is Biff Tannen's future grandson and the bully of Marty McFly Jr.. He was portrayed by Thomas F. Wilson, who also played Biff in the film.

Griff Tannen possessed one of these bats in 2015 and extended it for use during his exchange with Marty McFly, whom he believed was Marty McFly, Jr. Griff swung frantically at Marty, only to hit the video simulacrum screen in the Cafe 80's and also smash the taillight of his BMW 633CSi.

Griff Tannen, Grandson of Biff Tannen, is an 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.