Einstein, Doc Emmett Brown, and Rick Sanchez. Whether they'd be a guinea pig of a dog, a time travel inventor, or the smartest one in the universe, there was still really a fun connection to them all.

Of course, having the likeness in name and the fuzzy-haired look that the legendary Albert Einstein is just the start of it.

Doc Brown is a characterization of the mad scientist trope with his works not being understood by everyone and he is alienated for it. Among the top of the list of geniuses in that category is Albert Einstein.

From naming his 1955 dog as Copernicus and 1985 dog as Einstein, Doc Emmett pays a tribute to all the geniuses that his character represents.

Thus, the connection of a man and dog with symbolism and idols is what makes the Doc Brown and Einstein duo quite humorous.

As for how Rick Sanchez becomes the third or fourth Einstein in that picture is the fact that Rick and Morty's Rick is an homage to Doc Brown itself.

R&M creators loved the character so they decided to adapt it by mixing a bit of F4's Reed Richards on the side.

Albert Einstein, Doc Brown, Einstein the dog, and supreme smartness Rick Sanchez. They are interconnected in a great weave of similarities and conjunctions.

Alexander could only shake his head in regret. With Lloyd still caught up in 'Doc Brown' acting, having him say Rick Sanchez's 'Wubba lubba dub dub' phrase, and having Einstein dog beside him, everything would have come full circle.

It was too bad that Tiger, the dog actor, wasn't present and it made the circle incomplete. However, Alexander didn't fret much thought as he could still recreate it some other time.

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After his meet with Tiger and Lloyd, Alexander moved on to the make-up and rest area where the rest of the Back to the Future actors are waiting in place.

Although the day's filming schedule was all about Marty, Doc, and Einstein, everyone who should be on a sanctioned leave seems to be present and accounted for.

The highlight of the production they are working for is the 88 MPH revving DeLorean that can time travel and leave flaming tracks behind after all.

Although the effect would only be achieved after post-production, that didn't stop the cast members from wanting to see how Director Zemeckis would achieve it.

Sci-fi and fantastical scenes were a novelty and how filmmakers would achieve it is something to novel at as well.

Alexander then saw the idle cast members huddle among groups. Most probably, they are gossiping about Hollywood matters, exchanging their ideas about the script, or discussing how Innovative Rob would film things.

Alexander had pretty much correlated things about most of these cast members from all of their recent interactions and what he has mostly known about them from the past-future.

From what he gathered and knew, there was no doubt that being cast with three films in one go is a shot that could not be missed by most of them

Along with the great script and a director like Zemeckis on board, they were naturally attracted to be a part of it.

Aside from the inadvertent retention of Christopher Lloyd, there had been a few others in the past timeline that had somehow gotten back to their integral or semi-integral roles once again.

Alexander considered them to be the 'returnees' that were from the original BttF and fatedly returned to their roles in Creed version BttF.

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An integral returnee was Lea Thompson who plays Lorraine Baines-McFly and was attracted to the film due to her character being versatile.

It was a test of her skills as an actress and it was even more so now with the fact that Lorraine shifts a lot as the trilogy progress.

She was amongst the ones with the most prosthetic make-up and change-up work due to this. After all, she would play a stout mother, pretty teen, prettied-up mother, elderly grandma, boobed-up gal, and farm wife from the Old West.

If that wasn't challenging and hard enough for her, then Alexander didn't know what else could be.

All that he knows is that she should ready herself for all of it as a mom being in love with his son is a hard burden to play.

Overall, her character is also among the most humorous premise in the first film because of that lovestruck but ignorant setting.

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Next up on the 'returnee's list was Claudia Wells... well she was Jennifer Parker and Marty McFly's love interest in a dreamy high school sweetheart setting that is popular in the 80s.

Her character is somewhat of a vase and all that Alexander knows now is that she could finally play Jennifer for the entire trilogy and not be replaced due to unfortunate family loss.

Claudia wouldn't have to be replaced and wouldn't distract much of the watching fanbase. At least her character had a much more flexible film schedule due to Jennifer Parker only being needed to few times.

After all, Jennifer might be an integral character but she doesn't really have that much screen time compared to everyone else.

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Last among the 'returnee' lady bunch present is the semi-integral actress who played Linda McFly.

Linda was a troubled teen that didn't have much dating experience in pre-time travel 1985. However, she became a frequent boyfriend changer in the cheatedly-tinkered 1985 and money-threatened in Biffed 1985.

Original Linda was played by Wendie Jo Sperber and she was still retained as did the previous actress

It would seem that the reason behind her 're'-casting is the fact that she had always been linked to Rob and Bob in their films.

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Aside from the returnee actresses and Lloyd, it would also seem that an integral male cast had 'returned' to 'reprise' his role as well.

Opposite the mega-supporting Emmett Brown, Marty also has a semi-mega antagonist to deal with.

In every period of time that Marty could time-travel into, there is always a Tannen to rough everything up.

Towering Thomas Wilson was probably cast again by the casting director for his build and the fact that he was okay with being multi-parted like how Lea Thompson would be.

The actor is probably among the heavily make-upped cast group that has to go through a lot due to the changes in the timelines and the change of identity.

After all, Wilson would be the personification of the many Biffs, Griff Tannen who is Biff's grandson, along with playing the Old West Tannen ancestor, Mad Dog Buford.

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Alexander had already noted that his butterfly flap has changed a lot of things but it was still interesting to note that some were still able to take what they would have had or what they would have missed.

For one reason or another set of coincidences, these 'returnees' were still able to find the casting calls of the new Back to the Future and inadvertently reprise what they had in the 'past-future'.

This realization served to note Alexander on a lot of things regarding his alteration of history and all the other effects he would have moving forward.

Whatever chaos he had unconsciously cooked up, he now more or less knew that some things could still be relatively stable.