- "Okay I did it! The Mcfly's have been kicking Tannens around for centuries, and now we have the ultimate revenge! It's too bad grandpa Griff's not here to see it.."
- —Ziff Tannen Ziff Tannen was the grandson of Griff Tannen. His favorite magazine was Saboteur's Weekly. He sabotaged Marta McFly's spaceship in 2091 but was foiled when Jules and Verne Brown intervened. Trying to escape via jetpack, Ziff flew off course and crashed into the prison of which his grandfather was in, and much to Griff's disgust, Ziff was put in the cell next to the 95-year-old career felon.
Ziff was shown to have a persecution complex, as he cited that the McFly's were always kicking around the Tannens as his motivation.
Ziff's mixed metaphor was "I'm going to make like a banana and skedaddle" which is supposed to be "I'm going to make like a banana and split".
So far no other Tannen is portrayed or presented past Ziff's timeline in the year 2091.