Houdini's Magic Movie Ticket

Future Biff travels from 2015 to 1955, giving young Biff knowledge of the next half-century's sports wins. Future Biff returns to Hell-2015. Assumes the life of a very rich man.

Meanwhile, back in 1955, Young Biff gets rich. Hell-1985 is born.

Doc and Marty leave former-2015 and return to Hell-1985.

Doc and Marty leave Hell-1985 and return to normal-1955.

They fix things.

Return to normal-1985.

What of Old Man Biff? He left 1955 for 2015 a little before Doc and Marty arrived.

Time travel seems like a computer program. It's like there's an If-Then statement in between Biff's leaving 1955 and arriving at 2015.

If {Old Man Biff's efforts in 1955 paid off}
Then {Old Man Biff returns to Hell-2015, and is widely acknowledged as the richest man on earth}
Else If {Doc and Marty undo the damage in 1955 }
Then {Old Man Biff returns to his old, boring 2015 where kids fly around on hover boards }

I'll bet as soon as he got back to 2015, he wondered what in the world went wrong. He may have even made another trip...

But in the movie, they showed him returning to normal-2015. So does that mean that the 2015 Doc and Marty visited had already taken into account the trip they were about to make to fix things in 1955??

Whoa...complex...

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