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- "Okay I did it! The McFlys 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 sabotaged Marta McFly's solar sail ship, the MSC Marty, in 2091 but was foiled when Jules and Verne Brown intervened. Trying to escape via jet-pack, Ziff flew off-course and crashed into the prison where his grandfather was incarcerated and, much to Griff's disgust, 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 McFlys 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.