9:30 AM PST
"Wake up, honey," Lorraine said, as she walked into the bedroom. "Dr. Brown called several minutes ago, and he would like you to stop over by his place as soon as you can. Also, your dad and I will be going out for a little while - to play some tennis."
"All right, Grandma," Marty Jr replied. "I mean, Mom. I'm getting up now. So what do you have for breakfast. I need to grab a little something to eat, before I leave."
"I have some Eggo waffles," Lorraine replied, "and there is some apple syrup in the refrigerator. Have a good day, and watch out for Miff. I don't want you to get hurt."
"I really love you, Mom," Marty Jr said, as he threw his arms around Lorraine. "This is such lovely perfume that you're wearing. You really do smell nice and fresh."
"I love you, too, honey," Lorraine replied, as she kissed the top of Marty Jr's head.
"Good luck on the tennis match, Mom," Marty Jr said, smiling. "It looks like another really beautiful day today. I can see that the sun is shining really nice and bright."
"Yeah, it is a beautiful day for playing tennis," Lorraine commented. "Thank you for wishing me luck. I hope to be able to even the score a little, today. Your dad is just too good at this game, you know. Anyway, I guess having fun is what's important."
Marty Jr smiled, as Lorraine left the room. He was really amazed by how his paternal grandparents had so much in common with his own parents. It was nice to be able to see his grandparents at a younger age. This was the nice thing about time travel.
Marty Jr looked around his father's bedroom, and he was stunned by how he and his father both had a tendancy to keep their rooms messy. That was one more trait that he could add onto the extensive list of things that he had in common with his father.
He figured that it was not really a coincidence that he ended up sleeping in the same room that his father used to sleep in, but he still felt it was really amazing. He began to worry that his father may not want to return to 1986, which might put him in huge trouble. He decided that it might be better just to put the thought out of his mind.
He hoped Doc was able to repair the time circuits, as he was starting to miss his life back in 2016. He did still like the 1980s, but he realized how easier life was in 2016.
oooooooooo
"It's nice that you made it, Marty," Doc said, as Marty skated up towards the house.
"Have you made progress with the time circuits?" Marty Jr asked. "I need to pick up a few items for your older self. I forgot about that, yesterday. That was actually the very reason why you sent me back to this year. I got so distracted with the dance."
"I need to make several adjustments," Doc explained, "but I'm sure I will be able to send you back home at around eleven. So just try not to worry about it so much."
"That's a relief," Marty Jr replied. "I wonder how my father coped with spending that whole day in 2016. I hope I didn't get him into much trouble with Miff, but he had no right to be insulting to my father the way he was. My father is a wonderful person!"
"I can see that you really do take after your father," Doc said, smiling. "Anyway, be sure to come back here by eleven. Come to think of it, I wonder how my future self is doing. I wonder if he remembers the events of yesterday and today. There is this possibility, though, that he may actually undergo a condition of temporal amnesia."
"What is temporal amnesia?" Marty Jr asked. "What would bring on that condition?"
"It's a temporal kind of condition," Doc explained, "where you temporarily lose your memories of a certain period of time. Because you and your father switched eras, it has adjusted time in a certain way - where these two events are running concurrent with each other. This is what can cause my older self to undergo such a condition."
"Whoa, this is heavy," Marty Jr gasped. "Do you know what caused the time circuits to become fried? I wonder if this might have something to do with our switch."
"As a matter of fact, I believe that it does," Doc replied. "I have this theory that, as your father's DeLorean left this year, your DeLorean entered this year on the same trail as that of your father's DeLorean. Thus, this has fried up the time circuits."
"I'm really confused, Doc," Marty Jr said, sighing. "What are you saying about what happened? What do you mean I entered the same trail as that of my father?"
"Okay, you know how the DeLorean always leaves fire trails behind," Doc explained, "after the DeLorean breaks the time barrier? What happened was this. After you had entered this year, your DeLorean landed on this trail that your father's DeLorean left behind, after he left for the year 2016. Are you following what I'm saying, so far?"
"I think I get it now, Doc," Marty Jr replied. "I'm guessing that my DeLorean had also appeared at the same time that my father's DeLorean vanished. This is heavy."
"Anyway, I'm sure that my older self is trying to fix the problem, too," Doc added.
"Well, he is the one who needs to send my father back to this time," Marty Jr pointed out, "so that we don't have a paradox to deal with. I really do not want to know what it feels like to be erased from existence. I'm guessing that it must be very painful."
"According to your father," Doc replied, "it is very painful. Anyway, you'd better go pick up the items - and I'll be ready to send you back home at around eleven."
"See you later, Doc," Marty Jr replied, as he took off for Lone Pine Mall.
oooooooooo
Marty Jr breathed a sigh of relief, as soon as he returned to the Browns' house. He finally did manage to purchase the items that Doc of 2016 asked him to buy.
"Hello, Marty," Jennifer said, as she opened the door. "Doc is almost ready to send you back home. I wanted to say good bye to you, before you left."
"Thanks, Jennifer," Marty Jr replied, as he hugged his mother-to-be. "It will seem so strange to go back to seeing you as a middle-aged adult. Even if we were forced to kiss at the dance, it's been such a neat experience yesterday. I sure did have fun."
"I was laughing so hard," Jennifer commented, "by how you made Miff crash into a manure truck. It's sort of like a Tannen tradition, you know. Maybe Miff will learn to leave us alone, someday. I really see your father in you, Marty - and I am not just talking about yout physical appearances, either. I guess we really raised you well."
"All right, Marty," Doc said, as he stepped into the room. "I am ready to send you back to back to 2016. I'll send you precisely 24 hours later from the day that you came here. If I send you back any sooner, we could risk creating a paradox."
"Well, you're the doc, Doc," Marty Jr said, smiling. "I guess that's it, now. I'll see you again, in about thirty years. I have to admit that it will be nice to be back in 2016."
"Because both time periods ran concurrent with each other for the last day," Doc was quick to explain, "it will be important to not send you back any earlier."
"Got it, Doc," Marty Jr replied, as he hugged Doc and Jennifer. "Have a good future, you two. I hope my father gets back here safely, too."
"We'll keep our fingers crossed," Jennifer replied, as she smiled at Marty Jr.
Marty Jr smiled and waved to Doc and Jennifer once more, before he quickly stepped into the DeLorean. He decided to check the time circuits thoroughly, to be sure that everything was working properly. The flux capacitor was working, too. Marty Jr's heart was racing wildly, as he drove towards Hill Valley Park. As soon as he reached 88 miles per hour, the DeLorean broke the time barrier - with two minutes to spare.