Back to the Future is one of cinema''s most iconic trilogies, because its movies hang together so well. Here are 10 things ...

But in the sequel, Marty stumble upon a tombstone that read "Here lies Emmett Brown. Shot in the back by Buford Tannen over a matter of 80 dollars." ...

The other is the Doc from 1985, and he’s about 70. It’s the 70-year-old Doc that gets sent back to 1885, and there’s a time line where that Doc gets shot and killed by Buford Tannen.

It also gives some backstory to the troubled Tannen family through Buford, Biff’s great-grandfather, who was better known as “Mad Dog,” (a nickname he hates).

T here is a moment in Back to the Future Part III in which Marty McFly steps outside of the unfamiliar mores of the 19th-century American West and says of Buford Tannen, the man who has challenged ...

They of course end up doing just that, but while they're celebrating, the DeLorean gets hit by lightning, Doc goes back to 1885, Marty realizes 1885 Doc is eventually killed by Buford Tannen over ...

Incidentally, Thomas F. Wilson’s turn as the dumb-as-dirt Buford Tannen is some of his best work in the series. Thank goodness he’s out of the old man makeup in Part 3.

Starting with Griff Tannen and being repeated by frenemy Needles (Flea) and Buford “Mad Dog” Tannen, each instance has become a consistent reference in the overall story of Marty’s journey.

BACK TO THE FUTURE PART III has a plot hole in Doc Brown not knowing that Buford Tannen would try to kill him over a matter of $80 until Marty McFly told him.

But Buford actually made a brief "cameo" in Back to the Future Part II, when his picture could be seen in the Biff Tannen museum in the dystopian alternate version of 1985 that Marty travels to.