Griff Tannen

"I WAS FRAAAMMMEEDDDD!!!!!"

- Griff's final words.

Griff Tannen is the first villain in the live action movie Back to the Future Part II. He's Biff Tannen's future grandson.

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 arrest 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 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 joined 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 call Marty a "Chicken," and tried to hit him with a retractable bat.

The Hoverboard Chase
Marty managed to escape both Griff and the bullies. He 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 to crash into the courthouse. This cause Griff and the bullies to get arrested, altering the future timeline, preventing from Marty Jr. from getting arrested.