Griff Tannen

"What's wrong, McFly? Chicken?"

- Griff to "Marty McFly Jr."

Griff Tannen is the secondary antagonist of Back to the Future: Part II. He is Biff Tannen's future grandson.

He is portrayed by Thomas F. Wilson, who also played Biff.

Back to the Future: Part II
When Marty, Doc Brown, and Jennifer were head to the year 2015, Doc Brown told Marty that his future son; Marty McFly, Jr. was going to be arrested thanks to Griff. Marty disguised himself as his own son to prevent his son from going to jail.

The Cafe 80's
When Marty goes to the Cafe 80's, he encountered both old Biff and Griff, who turned out to be Biff's grandson. When Marty, Jr. went inside the Cafe 80's, Griff mistakenly thought that Marty, Jr. had left the Cafe. Griff and his gang of bullies tried to convince Marty, Jr. to join them to a robbery. Not taking "No" for an answer, Griff both abuses and tosses Marty, Jr. around. With Marty, Jr. knocked out, Marty took his place. Marty said "No" to Griff and tries to walk away. Since Griff doesn't take "No" for an answer, he called Marty a "Chicken," and tried to hit him with a retractable bat.

The Hoverboard Chase
Marty managed to escape both Griff and the bullies. Marty borrowed a little girl's hoverboard to escape the bullies. After a chase scene, Marty's borrowed hoverboard stopped because the boards don't work on water. Griff then took out the ultimate hoverboard; The Pit Bull. Griff used the Pit Bull and tries to hit Marty with his bat, but in the process, Marty dropped in the water, causing Griff to lose his balance, and he and his gang of bullies crashed into the courthouse. This caused Griff and the bullies to get arrested, altering the future timeline, preventing from Marty, Jr. from getting arrested.