Doc Brown is offering a special anniversary tour that will take us back to witness the historic events of 1955, one of the most important dates for time travel.
After visiting some of his assistants for a briefing in Doc Brown’s office, we board his family’s time train, now equipped with extra passenger seating for this special occasion.
After a reminder of the events that happened in 1955, (both times,) where Doc successfully brought Marty back to the future, we’re sent back in time ourselves.
But upon arrival it becomes clear that we’ve gotten a hitchhiker—older Biff climbs off the train, and he immediately teams up with young Biff back in the past (along with his goons) to try and steal our train for their own gain.
We travel around Hill Valley’s iconic clock tower square on the stormy night of the events of the climatic conclusion of the first film, trying to escape the Biffs, while also attempting to go undetected by Doc and Marty from the past, as those iconic events unfold around us.
Just as we defeat the Biffs and shake them off our tail into a manure truck to our right. We stop just in time to see the DeLorean speed down the road on our left, triggering the wire just as lightning strikes the tower, sending Marty back.
We feel the heat of the flames from the tires just as we ourselves speed back up into the sky, traveling back to present day, and back to where we started.