"So remind me again what we are hoping to find here, Doc?" Marty asked scratching his head.

It had been only a short ride to the storage warehouse where the three of them were now searching for shed number 67 which Emmett seemed to have leased in his name. So far they had reached 49.

"You will know when you see it Marty. It's just important that you find it".

"It's this one, I found it!" Jennifer had run ahead and reached the steel doors of the storage shed before either of them. Running to catch up Emmett was almost exploding with his usual excitement when he withdrew a three pronged device from his pocket.

"Special key for my unique lock", he held it up for the pair to see it. "What I have contained herein is too important for a regular lock to contain. So I designed my own".

He held it out further to Jennifer and motioned for her to take it.

"You can have the honors, my dear", He smiled broadly as he passed the key to her and stepped back just behind Marty.

Approaching the lock apprehensively she tried to insert the key gently at first and then a little harder.

"Something wrong, doc?" Marty noticed the puzzled look on his friend's face.

"Oh. Of course", Emmett slapped his head with his palm and motioned to Jennifer again, "It's upside down!"

"Right, so like this then?" she asked timidly as the key entered the lock flawlessly. Without doing anything else the mechanisms in the lock began to click and turn and as it did the sound not only echoed from the lock but from behind the door itself.

"Doc?" Marty asked again, a little more nervous.

"It's fine, all normal. I think. It will just take a minute". Doc sounded calm but his expression didn't ease the tension that both Marty and Jennifer were feeling. After all he hadn't really told them anything yet, he had just asked for the help and rushed madly to this place. Between whispers and shrugs when they thought the Doc wasn't listening all they had was speculation.

"Here it is. My Locomotive", Doc Brown stood back and raised his arms with all the pride only an inventor could fathom.

Jennifer and Marty were even more shocked then when they had been confronted with the returned Emmett Brown. Sure enough, contained in this tiny shed there was sitting the very large locomotive they had seen only moments earlier. Yet still there was room to move around inside.

"Impossible!" Jennifer exclaimed through the hand covering her mouth.

"Its bigger on the inside, care to explain this Doc?" Came the unavoidable question from Marty.

"Glad you asked", Emmett grinned and turned back to his invention,

"This extraordinary phenomenon is a result of a device I constructed with some collaboration with my sons. I came up with the idea when I was tinkering with the flux capacitor. In much the same way the flux capacitor facilitates for the temporal shift and movement around a vector through two fixed moments in time, this Spatial Flux Inhibitor is able to create something of a demi-universe in amongst our own. Like when a black hole rips a hole in the space time continuum and focuses it into one narrow singularity, the Spatial Flux Inhibitor is able to open a hole in the continuum and widen it or narrow it to my specifications while keeping the universe outside perfectly stable".

"Just agree with him and look astonished when he shows it off to you", Marty had muttered into Jennifer's ear. Like Marty, she had not been able to grasp most of what Doc Brown had said and so was left trying her best to appear like she had.

Entering the Driver's cabin and exiting soon after, Doc Brown revealed what appeared to be a tiny black cube.

"Amazing isn't it, a pity we don't have any time to waste. Well, we have plenty but I would prefer that we got this over with quickly". He closed his hand around the cube and carried it back onboard the locomotive, "Hurry now"

The pair scrambled after him and after Marty helped Jennifer into the remarkably clean and decorated cabin he followed close after her.

"Hold on to your hats, there, this bucket can really fly". Shoveling another two loads of coal into what appeared to be an already burning fire, Doc Brown pulled various levers and programmed in his destination in time.

Jennifer held Marty and Marty held the side of the cabin to remain stable, the swaying of the Locomotive as it took off and exited the Storage shed was almost enough to knock them over. As the engine approached 88 and sparks began to fly the pair did fall down and when they stood again all they saw was a clear starry night sky in the distance.

"Now that we are here, Doctor Brown, you think you can give us some sort of explanation", It wasn't Marty this time but Jennifer that had stepped up to confront the Doc.

"Yeah, where are Clara and the kids?" Marty picked up her lead right away.

He hung his head and motioned to a long red chair towards the back of the cabin, "Sit down children, this might be a bit much for you to handle. I know it was for me".