That’s when Marty realizes inPart IIthat he’s definitely not in a normal timeline.

Gotta keep these things consistent, apparently.

He also later sees his alternate-reality mother (which sort of counts).

Custom image of Marty McFly against a lightning background

Custom Image by Zanda Rice

It’s fun to see Seamus, Marty’s future self, and Marty Jr. all played byMichael J.

Likewise, all the Lorraines and Maggie are played byLea Thompson.

Finally, the third movie shows Doc still in disbelief about the whole thing.

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Luckily, he’s got that letter from 1885 to help.

There’s a lot going on.

Oddly, we never meet Biff’s son, but that just makes this universe all the more fascinating.

George and Lorraine dancing in Back to the Future

Image via Universal Pictures

In the first movie, he trips Biff in a diner.

and punching Biff in the face.

Then he pushes the bully’s friends out of the way and runs off.

Marty playing guitar on stage in Back to the Future

Image via Universal Pictures

When Biff starts to come to, he stares up at Marty and exclaims, “You!”

So Marty easily knocks him out and then steals his almanac.

Marty gets shot in his duel with Mad Dog Tannen, and everyone thinks he’s dead.

Lorraine Baines (Lea Thompson) with Marty McFly (Michael J. Fox) in ‘Back to the Future’

Image via Universal Pictures

The car runs into a truck full of manure, and the bullies get buried in it.

So they do it again inPart II.

“InPart III, Marty punches Buford face-first into a wooden wheelbarrow of green manure.

Michael J. Fox plays both an older Marty McFly and Marty Jr. in ‘Back to the Future Part II’

Image via Universal Pictures

These amusing spins on the formula help make each part of the trilogy amongthe funniest time-travel moviesever made.

Then we get to the third installment, which takes things all the way back to 1885.

The letter that Marty receives from 1885 is cool, too, helping to make this trilogyMichael J.

Doc holds a controller next to Marty, both with shocked expressions, in ‘Back to the Future’.

Image via Universal Pictures

Fox’s most legendary contribution to cinema.

NEXT:‘The 10 Best Musical Numbers in Non-Musical Movies, Ranked’

Younger and older Biff Tannen (Thomas F. Wilson) talk in a car in ‘Back to the Future Part II’

Image via Universal Pictures

Biff talkign to Marty in Back to the Future

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A car buried under a pile of menure in Back to the Future

Image via Universal Pictures

A photo of Marty and his siblings in Back to the Future

Image via Universal Pictures

Marty McFly (Michael J. Fox) finds his unconscious son, Marty Jr., in ‘Back to the Future Part II’

Image via Universal Pictures

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Christopher Lloyd

Michael J. Fox