2105
The Time Train soon came out of another portal once they had completed the temporal displacement of time travel. Marty gasped as he looked around him.
"Doc, where are we? When are we?"
"The 22nd century, my boy! We are in Hill Valley, California, at exactly 8:04 AM on October 29th, 2105!"
"2105?! You mean this is 90 years in the future?"
"Precisely!" the old scientist said.
The Time Train soon touched down on the outskirts of the futuristic Hill Valley. Before they left the vehicle, Doc explained the situation to Marty Jr.
"You're great-grandson, Martin Seamus McFly V, is going to be arrested for participating in a robbery with Ace Tannen…if we don't prevent it. You are going to pose as him at the Millennium Cafe and refuse the offer Ace gives you!"
Marty Jr. nodded. The pair proceeded to the Millennium Cafe. Marty Jr. posed as his great-grandson successfully, after switching places with him when Ace knocked the latter out for being indecisive about the offer. "Stay down and shut up!" Marty Jr. told the disoriented Marty the V. Marty Jr. refused Ace's offer, but when challenged, Marty used the new-found courage he had found in 1925 to try and fight Ace and his gang. This did not go well and he was forced to flee, with Ace and his friends giving chase. Marty stole what he read was a Skaverboard, a hybrid between a skateboard and hoverboard. He clumsily operated it and flew around Hill Valley Square, alternating between wheels on the ground and an instant hover conversion at will. When he found himself suddenly cornered by the gang as they appeared out of mini-portals, Marty pressed a button on the Skaverboard with his foot. Instantly, a portal appeared just in front of him and he was sucked into it. Pressing the button again, he came out of another portal on the other side of the square. Teleportation! He watched as Ace and his gang, who he had inadvertently faked out, crashed into each other and then into the Hill Valley Technology Center. This building now was where the Hill Valley Museum had stood nine decades before. Accused of trying to steal developing technology, Ace and the others were arrested, but now Marty the V was spared!
Storm clouds had gathered when Marty Jr. returned to the outskirts of Hill Valley. He watched as a news-headset that Doc had acquired in this time suddenly change its automated vocal wording of the headlines. "Marty McFly V convicted…..Marty McFly the V awarded medal." The Time Train was floating lazily in the air above. "Alright, Jr. I'll bring her down and let you on!" Doc called. Suddenly, a flash of lightning hit the Time Train, activating the Flux Capacitor and subsequently the Portal Button that Doc had equipped to the vehicle after a teleportation conversion. In a flash of electricity, flame and portal, the Time Train disappeared!
"DOC!" Marty Jr. screamed into the empty night. Just then, he heard a voice behind him.
"Are you Marty McFly Jr.?" Marty Jr. turned. A man in a trench coat with an electronic umbrella was behind him. He held out an envelope. Marty took it, and opened it. Upon reading its contents, he cheered.
"The Doc's alive!" he cheered.
"Wait, son! Who's alive?" the man in the trench coat asked.
"No time to explain!" Marty Jr. hollered as he ran off into the misty night.
It turns out that Doc had been sent back to the year 1715 when the Time Train was struck by lightning. He had written a letter to Marty Jr., to be delivered by Western Union just minutes after he saw the train struck by lightning, detailing where the train had been buried in an abandoned mine near Hill Valley for nearly four centuries. Using detailed instructions left in the damaged train, Marty repaired the time machine. A few days later, Marty Jr. steered the Time Train into the air and gunned it up to 88 MPH. In a flash of electricity and flame, the machine disappeared into the portal and was gone - headed for 1715…