The DeLorean in BTTF, not just a time machine, but a space ship

[Skywalker]

The way I've always seen it was that it wasn't the same Doc from the same timeline. The Doc that left to go to the future wasn't the same one that came back for Marty. He goes to the future, but we don't really know what time he went to, do we? Meanwhile, Doc that came back for Marty in the Hovercar version of the DeLorean came from 2015, as an older version of himself, where all these things about it were common, so that's why nobody was suspicious, because when they go back to 2015, you see that the DeLorean isn't the only hovercar. I see it as Doc having upgraded it over time with updated technology available at that time. The one that left to go to the future is the one that will eventually become 2015 Doc. I see him having spent more than a few hours there. More like 20 years or so. That's why he knows so much about what's happening and why he needs Marty's help. It's more natural to think he'd know of these developments after having lived in that timeline for years rather than a few hours.

The Doc in 1985 was around 60 years old and would've been 90 in 2015. It's highly unlikely that the Doc who came back for Marty is the a naturally aged (and de-aged with surgery) Doc native to 2015. And we do know where the Doc at the end of BttF is going he out-right tells Marty he's going thirty years into the future.

I believe you misunderstood his point. I believe he meant that the Doc who traveled 30 years into the future then spent around 20 years (Doc's personal time/age) time traveling after that. Where he could see that that one mistake of Marty Jr.'s led the McFly family down the path of ruin (remember the newspaper that changed was from a few days father ahead from where Doc took Marty to fix it). He even says he traveled further ahead to see what happens. This is why he needed the rejuvenation surgery to make himself appear the same age as when he left 1985 and be recognizable to Marty. So it is obvious that he did more than a single jump forward and then back to 1985, even though he was only gone a couple of hours in real time.

So the Doc Brown that came back to get Marty in 1985 was quite possibly only one of an infinite potential of alternate time-line Doc's. In fact, the original Doc Brown from BTTF1 died! When Marty returned to 1985 at the end of the movie, he returned to an alternate time line. One where George McFly became an author, the Twin Pine Mall became the Lone Pine Mall, and Doc learned the fate of the original and took steps to avoid the fatality. But in that original time line, which actually still exists but is no longer the powered up Prime Reality, Marty disappeared forever that night, Doc Brown was found dead in the Twin Pine Mall parking lot, and the Libyans likely got away after their VW bus crashed into the Photomat.

This is heavy...

 

[the Dagman]

The Doc in 1985 was around 60 years old and would've been 90 in 2015. It's highly unlikely that the Doc who came back for Marty is the a naturally aged (and de-aged with surgery) Doc native to 2015. And we do know where the Doc at the end of BttF is going he out-right tells Marty he's going thirty years into the future.

I believe you misunderstood his point. I believe he meant that the Doc who traveled 30 years into the future then spent around 20 years (Doc's personal time/age) time traveling after that. Where he could see that that one mistake of Marty Jr.'s led the McFly family down the path of ruin (remember the newspaper that changed was from a few days father ahead from where Doc took Marty to fix it). He even says he traveled further ahead to see what happens. This is why he needed the rejuvenation surgery to make himself appear the same age as when he left 1985 and be recognizable to Marty. So it is obvious that he did more than a single jump forward and then back to 1985, even though he was only gone a couple of hours in real time.

So the Doc Brown that came back to get Marty in 1985 was quite possibly only one of an infinite potential of alternate time-line Doc's. In fact, the original Doc Brown from BTTF1 died! When Marty returned to 1985 at the end of the movie, he returned to an alternate time line. One where George McFly became an author, the Twin Pine Mall became the Lone Pine Mall, and Doc learned the fate of the original and took steps to avoid the fatality. But in that original time line, which actually still exists but is no longer the powered up Prime Reality, Marty disappeared forever that night, Doc Brown was found dead in the Twin Pine Mall parking lot, and the Libyans likely got away after their VW bus crashed into the Photomat.

This is heavy...

Is something wrong with the Earth's gravitational pull?

 

[EyalM]

. This is why he needed the rejuvenation surgery to make himself appear the same age as when he left 1985 and be recognizable to Marty.

I think you misunderstood that. The actor was wearing ageing makeup in the original movie's 1985 and was playing his own age (more or less...) in 1955. They probably didn't want to keep him in old age makeup for the two sequels, so they gave him the "rejuvenation treatment". When Doc travels back to 1985, he puts on old age makeup just so Marty will recognize him, and he takes it off a few scenes later.

 

[Harvey]

Doc laments before leaving 2015 that he regrets having never visited the Old West but considering he has 19th century money in the suitcase it seems possible he may have visited there and was just throwing Marty off his scent or something. (And, yes, it's possible Doc acquired the money by other means but I find it hard to believe Doc could easily acquire vintage dollar bills easily unless while in 2015 he discovered eBay. )

I don't think BACK TO THE FUTURE PART II suggest that Doc was busy time travelling before he re-appears at the end of the first movie. There are much easier ways of assembling currency than time travelling to each era. Doc obviously came from money (he had a family mansion until it went down in flames, after all) and it's not unreasonable to assume he just bought up historical currency (or purchased cheap reproductions).

 

[JarodRussell]

The Terminator seems to acknoledge it, too. Since none of the people and Terminators sent with the same time machine end up in the same place.

 

[Mr. Laser Beam]

. This is why he needed the rejuvenation surgery to make himself appear the same age as when he left 1985 and be recognizable to Marty.

I think you misunderstood that. The actor was wearing ageing makeup in the original movie's 1985 and was playing his own age (more or less...) in 1955. They probably didn't want to keep him in old age makeup for the two sequels, so they gave him the "rejuvenation treatment". When Doc travels back to 1985, he puts on old age makeup just so Marty will recognize him, and he takes it off a few scenes later.

I always just thought that was an in-joke. Doc basically looks the same when he pulls off the age makeup in BTTF II; I thought he was just wearing it to make himself feel important. Every time I saw that film in theater, the audience burst into laughter during that scene.

 

[Trekker4747]

No, the "rejuvenation" and the "disguise" was all part of the notion of not having to deal with the old-age makeup for the movies anymore. Lloyd was closer to the age of his 1955 character than the 1985 version (where old-age makeup was used.) The "rejuvenation" was so they could "deage" Lloyd and not have to mess with the makeup.

I don't think BACK TO THE FUTURE PART II suggest that Doc was busy time travelling before he re-appears at the end of the first movie. There are much easier ways of assembling currency than time travelling to each era. Doc obviously came from money (he had a family mansion until it went down in flames, after all) and it's not unreasonable to assume he just bought up historical currency (or purchased cheap reproductions).

Point and fact. Doc says he spent nearly his entire family fortune building the time machine, including celling his home and land to developers. So by the time the events of the first movie take place Doc has spent quite a bit of, nearly all, of his money. It's possible part of that included buying or acquiring vintage money. However, when he leaves Marty in 1985 it's obvious the time Doc spends in the future had to be a matter of days if not weeks to at the very least get the hover and fusion conversions done to the car.