Back at Doc's lab, everything hadn't changed much. It had been cleaned up a little over the past six months and everything seemed to be in order. Even the model of Hillvalley that Doc had made in 1955 was sitting in the middle of the lab. Doc hadn't touched it since.

Einstein's food bowl sat untouched under Doc's dog feeder invention. It had been cleaned from the wet dog food that dried over the past six months. The giant speaker that Marty had allegedly destroyed before everything changed was still there and back to way it was before.

A sign hung on the front door that said, 'Estate Sale, May 14, 1986,' Marty and Ally burst through the door in a panic. "Dad, are we too late to stop the-" Marty began, "Sale?" The siblings saw that the sale was going normally. People were browsing around Doc's items that were for sale.

"I think we made it on time," Ally said, her eyes widened that they were looking at Doc's stuff. George turned towards the siblings and gave them a smile. "Better late than never. You two wouldn't believe how stuff is back here!" he said, walking towards them.

"That's Doc's stuff, Dad!" Marty exclaimed, sounding a bit irritable. "Yeah, dad, they can't do this!" Ally agreed. George walked over to them and explained, "Now, I know you two are upset, but your friend's been gone for months and the city really seems to be hellbent on using this land for this new parking garage and..." He kept on his explanation, his eyes caught sight of something else.

"Hey! Is that a first edition Jules Verne!" he said, his eyebrows raised in excitement. He walked over to said Jules Verne novel. Neither of the siblings didn't think that this was fair. Shouldn't they get a say in this? They knew Doc way longer than their own dad.

"At least things can't get any worse," Marty said. Just as he said this, there was a commotion coming from behind them. They looked behind them and see Biff wearing Doc's mind-reading device on his head. He was obviously going through Doc's stuff. "You had to say it, didn't you?" Ally said, rolling her eyes before walking away.

"I didn't know he was here," Marty whispered, walking with her. Biff started walking behind them. "Came to see if the old crackpot had any buried treasure?" he asked, drinking something out of a can.

They were looking at Doc's inventions that he had made over the years. Marty was looking at the self-dog feeder while Ally looked at the clocks that moved in sync, and the way Doc's bed was set up, finding it hard to hold back tears.

"Nah, we're just... remembering," Marty said distantly, looking down at Einstein's empty bowl. "You shouldn't even be digging through his stuff," Ally said, walking around the lab. However, Biff hadn't listened to her and kept messing around with Doc's stuff.

They had to look around the lab for things that Doc left behind; things that could be considered dangerous. Ally sees that Marty was standing by the model of Hill Valley. "What're you looking at, Marty?" she asked him, walking up to him on his right side.

"Remember when Doc built this model of downtown Hill Valley when we went to 1955?" he asked, halfway smirking at her for a moment. Ally smiled back at him and replied, "Hey, the clock tower in the courthouse works," She walked around the model and saw that the back was open partially.

"Huh? What is-?" she questioned, keeping both eyes focused on it. "What is it, Ally?" Marty asked, seeing the uncertain look on her face. He saw what she was looking at. Something was sticking out of the back of the model courthouse.

"Is that Doc's notebook in there?" he asked. "Yeah, I think so," Ally said. Marty was about to grab for it but Biff gets ahold of it before he could. "Hey, that looks like the courthouse! You gotta hand it to the old coot... he was good with his hands," he said, picking the model of the courthouse up.

They couldn't let Biff hang onto that model; they had to get that notebook. "Uh, Biff, can we see that a minute-?" Marty asked. However, Biff didn't hear Marty's sober question. All he did was look at the model of the Courthouse closely.

"This would look great in my fish tank! Give the ol' carp somethin' new to nibble on," Biff said, looking at the siblings.

"Well, can we take a look at that model courthouse for just a second? There's somethin' in it and we need to get it out," Marty clarified. "Like what, a 'not guilty' verdict?" Biff questioned, confused.

Ally rolled her eyes at that and Marty looked irritable. "That was a joke," Biff said. "Oh, yeah. It's very funny," Ally said sarcastically, "But, we seriously need that model courthouse. Can we have it?"

"No, I think I'll hold onto it," Biff denied, frustrating the siblings. They didn't time to argue with him. Why did he have to be so stubborn? Then again, all of the Tannen's were.

"Give it here, Biff!" Marty shouted, reaching for the model courthouse. He did manage to grab it, however, that caused the top of the model courthouse to open. Biff reached inside and pulled out the journal that the siblings were trying to get, turning his back to them.

He started to look through the journal, finding the page with the flux capacitor. "Looks like plans for something! What's a 'flu catheter?'" Biff asked, cocking an eyebrow.

Marty shook his head and said, "It's none of your business! Doc asked us to-" "Brown's wormfood, you two. But THIS looks like it might be worth something! Haw!" Biff guffawed. He then walks away from the annoyed teenagers.

"Asshat..." Ally muttered under her breath, "How're we gonna get the journal back from Biff?" Marty rubbed the back of his neck and he spotted his guitar sitting in a box that George had brought out from under a table. "Got an idea. C'mon," Marty said, moving his head to beckon Ally to follow him.

They walked over to the small, yellow guitar. Both noticed that the guitar had a price tag hanging from the neck of it. "Hey, Dad, why's my guitar got a price tag on it?" Marty asked.

George shook his head with a sigh. "Sorry, son. Must have been an overzealous clerk. Just pick it up," George apologized, "I'll iron things out with the bank,"

Marty picked the guitar up by the neck and walks over to the now-fixed amplifier. "Marty..." Ally started, knowing what he was planning. Marty turned around to face her. "Rock out," she said, clamping a hand on his shoulder.

Marty hooked his guitar to the massive amplifier before picking the guitar up. "Here's an oldie but a goodie," he said, holding onto his guitar pick. Before he could play, Biff walked by the siblings with the model courthouse, laughing at Marty's attempts to play guitar.

They saw that Biff had set the model courthouse a few yards from them. It was their opportunity to get the notebook. Biff suddenly grabbed the neck of Marty's guitar and snatched it from his hands.

Ally groaned in agitation and walked over to Marty and Biff. "What the hell are you doing with Marty's guitar, Biff?" she asked, her tone showing that she was annoyed that Biff took Mart's guitar like that.

"Lemme show you how it's done!" Biff exclaimed. Thankfully George saw what was going on and stepped up to intervene. "Now Biff, I believe that's Marty's guitar," he said.

Biff glanced over at George, remembering what he had just done. "Oh? Gosh, ha ha-you're right, Mr. McFly!" Biff stammered, giving Marty his guitar back to him, "Here ya go, Marty! Let's hear a few licks!"

A small smirk formed on Ally's face when she watched this exchange. It was always satisfying to see Biff be the subordinate of George. Biff would get corrected whenever he stepped out of line.

Marty played a little bit on his guitar before he set it against the amplifier. "That was pretty good, Marty," Ally commented, patting him on the shoulder. "Yeah, that was sizzling hot! Like a melting ice cube," Biff said, cracking a smile.

The siblings heave a sigh before walking over to their father more about the situation at hand. "Hey, dad," Marty said. "We get that you're trying to help but I think we can handle ourselves," Ally added, defending her brother.

George smiled at the duo and said, "He may talk big game, but he's not as tough as you two think. I've been dealing with him a long time... believe me, I can handle him,"

"So can we," Marty said, glancing down at Ally for a moment. Ally glanced back at him, remembering how much they put up a fight against Biff and his relatives. George only nodded at what Marty said. "Alright, I'll stay out of your way. If you two need me, then you know where to find me," George said to them, willing to give them some space to figure things out.

"Who's running the sale anyway?" Marty asked with a smirk. "Oh, that'd be me, son," George answered smoothly. Ally cocked her eyebrow and wondered, "How come?"

"Well, once it became apparent that the bank was going through with the sale. I volunteered to oversee it in order to make sure Doc's stuff would be treated with a modicum of respect," George said, turning to look at Biff, keeping his voice firm, "Isn't that right, Biff?"

Biff peeks around the corner of a pillar and looks at George with a submissive expression on his face. "You got it, Mr. McFly!" he exclaimed. Ally rolled her eyes because they all knew that Biff wouldn't listen.

"We're gonna keep looking around. Thanks, dad," Ally said, giving her dad a smile. They walk from their dad and walk over to the amplifier again. Ally glanced down at Marty's guitar and gently nudged him to get his attention.

"Hey, Marty. I'm feeling up to another guitar lesson," she said with a smile. Marty had been teaching Ally how to play the guitar as a way to help her with her music. It was something that they could bond over also.

"Sure thing, Ally. Quality's good, but it needs more bass. And treble. And volume," he said before going to pick it up. He handed it to Ally, putting her hands in the correct positions.

"Okay, put your left hand here," he instructed, placing her hand towards the end of the neck of the guitar. "Alright, now this is one I know the kids are gonna like," she said, lifting up the pick up, getting ready to play.

Just then, Biff came over and snatched the guitar from Ally's grasp. "Thanks for warmin' 'em up for me, buttheads!" he laughed, holding the guitar. "Really?" Ally said with exasperation. She was irritated that Biff disrupted her guitar lesson.

After Biff played his piece, he sets the guitar down by the amplifier before walking off with the courthouse. They couldn't give up just yet; they had to get that notebook from Biff before they left Doc's lab.

"Hey, Biff. That notebook wouldn't mean anything to you. You wouldn't understand what's in it," Marty said, his voice firm. Biff looked at him closely, raising his brow. "No, it's not just that. That notebook reminds Marty and me of Doc. It's got sentimental value," Ally told him. That wasn't at all a lie; that notebook was still a piece of Doc and they wanted it as a keepsake.

"Doc's dead! It's time to get over it and move on," Biff exclaimed. Ally shook her head and walked off, feeling slightly angry that Biff would even say that. Unlike him, they had the closest relationship with Doc.

They made their way to the amplifier, knowing what they had to do. They were gonna do to Biff what Marty did six months ago when Doc had been gone for that week. The week that Doc had invented the time machine.

Marty turned the knobs on the amplifier about halfway. When Biff grabbed the guitar again, Ally turned the knobs up all the way discreetly. "Watch me blow the roof off this joint!" Biff exclaimed.

"Whatever you say," Marty said, shrugging his shoulders. "Y-Yeah, break a leg," Ally sarcastically said. Biff grinned sheepishly at their answers and lifted the guitar pick.

When Biff strummed the guitar, the frequency caused him to fly back into the living chair that was sitting in front of a bookshelf, knocking its contents off and onto Biff's head. The impact caused Biff to become dazed.

"Rock on, Biff," Marty said with a smile. With Biff out of the way, they were able to get the notebook. "Finally," Ally said with a smile. Marty opened the notebook to Doc's to-do list that read,

October 25th, 1985- To-Do

-Bulletproof Vest

-Take Einstein on Pre-Experimental Walk

-Check Time circuits re: stickiness

-Remind Marty and Ally to bring camera

"Aw, Doc... where are you?" Marty wondered. Suddenly, the familiar three sonic booms came from outside, the light shining through the windows of the garage. Their eyes widened in surprise. "Um... I think we have our answer," Ally said in complete awe. "Cmon, let's check it out," Marty said, pulling her towards the door.