That is a good question- but Biff knew it was a time machine after overhearing Doc tell Marty it was not invented for personal gain.
He could have done that- but there needed to be another adventure so there could be a third movie.
Biff Tannen is the bully in Back to the Future. He is played by Thomas F Wilson.
His first known ancestor was Buford "Mad Dog" Tannen from 1885, who was a corrupt bully himself, and it just passed down to the next generations to Biff's grandson, Griff Tannen.
Thomas F. Wilson. Better known as "Biff Tannen" from "Back to the Future."
marty goes back to 1885 to save doc from getting shot by biffs grandfather mad dog tannen
He could have done that- but there needed to be another adventure so there could be a third movie.
Back to the Future The Game - Episode 2 Get Tannen - 2011 VG was released on: USA: 17 February 2011
Biff Tannen is the bully in Back to the Future. He is played by Thomas F Wilson.
His first known ancestor was Buford "Mad Dog" Tannen from 1885, who was a corrupt bully himself, and it just passed down to the next generations to Biff's grandson, Griff Tannen.
While it is not ever mentioned in the movies- the original script for "Back to the Future 2" supposedly said he had a son named Biff Tannen, Jr.
Biff does not have a nickname, but his ancestor is Buford "Mad Dog" Tannen.
Thomas F. Wilson. Better known as "Biff Tannen" from "Back to the Future."
Charles Tannen's birth name is Charles David Tannen.
Steve Tannen was born in 1968.
Biff Tannen was created in 1985.
Deborah Tannen was born in 1945, in USA.
Sam Tannen goes by Sam Saturday.