In Back to the Future II, Doc pulls out a money suitcase (see image below) in 1955 for Marty to use a time-appropriate currency. Simple question: where did Doc get all that money from in the first place?

One could speculate that he obtained this money, legally of course ahem, from time traveling between the end of the main events in BTTF I and when he returns from the future at the very end of BTTF I, but he did say to Marty he was going 30 years into the future just before that journey. I'm looking for a canon or at least authority-supported answer.

Doc's money suitcase in 1955

  • 12
    I'm not putting it past Doc to rob banks throughout history. In fact, I'd watch that movie so hard Jun 3, 2015 at 1:09
  • @JasonBaker I highly suspect that's what he did too. Considering his past with Libyan terrorists and God knows what else, it's well within character, not to mention for a good cause ;) Jun 3, 2015 at 1:13
  • 5
    Knowing what, when, and where disasters or ill fated journeys took place would allow Doc to collect funds that would never be missed. Or he could rob banks. Both sound like viable time travelers opportunities. Jun 3, 2015 at 1:41
  • 18
    @JasonBaker "Is this a hold up?" "It's a science experiment!" :)
    – Deepak
    Jun 3, 2015 at 3:05
  • 1
    Well, Doc Brown was alive in 1885, with advanced knowledge of future technology and future events. That leaves 100 years for a "mysterious ancestor" to collect notes of different vintage and start the accumulation of the Brown family fortune.....
    – PhasedOut
    Dec 1, 2016 at 21:44

7 Answers 7


I don't know of anything that specifically addresses the money collection--Bob Gale and Neil Canton don't talk about it in the DVD commentary for that scene, and the usually-pretty-complete Futurepedia doesn't give details about where Doc got it in the money entry--but since Doc was implied to be pretty well-off in 1985, he could have either just bought old bills from collectors without needing to do any extra time-traveling, or perhaps he bought something valuable in all times like gold and then jumped to different times to exchange it for cash.

Although thinking about this, it seems like there is some circumstantial evidence that he didn't actually time travel to each period to get the money--in part II when Doc was talking about destroying the time machine as they were about to leave 2015, he said "My only regret is that I will never get a chance to visit my favorite historical era--the Old West", indicating he hadn't yet visited that period despite having bills from 1861, 1863, 1864 and 1875.

I suppose he could have visited the 1800s in a different geographical region than the Old West, but you'd think if he was in the era he would have made a visit, not to mention the DeLorean always took you to the same place on Earth in a different time, and in all their onscreen adventures we saw them remain in the California area.

As for why I say Doc was well-off in 1985, and what the in-universe explanation for that is, writer Bob Gale suggests in this MTV interview that Doc got a bunch of money (presumably to fund his experiments, not to mention buying a DeLorean) by burning down the family mansion he had been living in in 1955 and getting the insurance money.

From the interview:

The opening shot, when the camera is going through Doc's laboratory, there's a newspaper on the wall that says the Brown mansion was destroyed in a fire. You can infer from that that maybe Doc set his house on fire to collect the insurance money.

And if you look at the newspaper clipping in the opening shot, there's also another one next to it saying "Brown Estate Sold To Developers: Bankrupt Inventor Sells Off 135 Prime Acres", so whether or not the insurance thing is true, there's evidence in the film he made a large sum by selling the land.

enter image description here

(people say online that this newspaper says the mansion burned in 1962, though it isn't visible in this screenshot)

  • I guess seeing as though the mansion burned down following his vision of the flux capacitator, it is likely that he realized the need for money from different times to purchased them legally. I'll see if any other less speculative answers arrive, but I suspect that you're on the money (so to speak) here ;) Jun 3, 2015 at 2:36
  • @N.Soong - BTW, I remembered a comment Doc made suggesting he hadn't actually been to the periods he had money from...see the edited first paragraph of my answer.
    – Hypnosifl
    Jun 3, 2015 at 16:39

As this is not a canon-supported answer, I originally started adding it as a comment, but I quickly realised it's too long for that format.

I always thought Doc acquired the currency legally. Even though Doc's done plenty of illegal stuff, I think robbing banks for money is a little beyond the pale. The criminal acts that Doc's performed have always been out of a more "noble" necessity. The train hijacking in BTTF3 was probably the most egregious, and that was done solely to return Marty to his own time.

Plus Doc's got this whole thing about not altering the continuum, can you imagine what a whole string of bank robberies through time might cause? Even discounting the financial ramifications of the robberies, if even a single serious injury or fatality were to result from a historical robbery, that would have dire consequences for the future. I simply don't think Doc would have risked getting the currency through dishonest means, especially using the threat of lethal force.

So how might he have acquired all that currency legally? Here's how I might've done it if I had been in Doc's place. Doc would've had to start off being quite well-off, as has already been mentioned. I imagine he would've taken a large amount of gold (which has pretty much always had value to humanity) into the earliest time period he wanted to get currency from and traded some (or all) of his gold for it. Then he could make relatively small jumps forward in time (say 20 or so years) so that he could easily exchange some of the older currency for the newer.

Alternatively, he could use his gold stockpile to purchase the newer currency, and this would be more viable if the price of gold in that era was higher. By keeping the time jumps small, he makes it easier to trade older currency for newer and also keeps the attention factor (from having large amounts of vintage currency) low.

  • 1
    Seems tedious. I bet the future has some nifty 3d printers though
    – user16696
    Jun 3, 2015 at 6:18
  • 1
    @cde Point taken, and if Doc were to use "dishonest" means, I guess counterfeiting would be an easier option. However, counterfeits are almost never exact, although this is probably less of a concern for older currency with fewer security features. The other thing I wanted to mention is that since 3-D printers were not a "thing" back when the story is written, I don't think the authors would've anticipated their advent! :)
    – Deepak
    Jun 3, 2015 at 6:38
  • 1
    Well, really advanced xerox machines and fax machines. Plus doc had spending money, not millions. An extra hundred or two wouldn't affect the economy so I think that passes doc sniff test for time travel and criminal conduct
    – user16696
    Jun 3, 2015 at 14:01
  • 1
    This starts off with Doc already having a big sack of gold. A cheaper, maybe easier idea could be one that Sabrina's aunts said they used (from the Sabrina the Teenage Witch show - they were 600+): Collect real cheap things that will be very valuable in the future, then just sell them. Things like toys, lunchboxes (I think that was what they had in a Sabrina episode), anything small & relatively cheap to buy new.
    – Xen2050
    Dec 18, 2015 at 14:45
  • If Doc was robbing banks he would have need a team. That means he would have told them a secret information about the time machine, which would increase the risk of its stealing. May 27, 2017 at 17:21

The comic Back to the Future Vol. 1: Untold Tales and Alternate Timelines answers these kind of questions. As Bob Gale worked on it, it can be considered canon. When Doc travels to the future, he wins an old timer car competition, where the prize is pimping up the winner car at a reduced rate. (This is how the DeLorean got Mr. Fusion + the ability to fly.) To get the rest of the money, Doc travels to the past, buys a couple of Action Comics issue 1s, and then sells one off in the future. As it is in perfect condition, it is worth a LOT of money.


When I first saw this scene in the movie I wondered the same thing? At the time I simply assumed that Doc had prepared the case of money before his time machine even worked. Using in-movie clues we have:

1) The obvious well-to-do lifestyle of the Doc in 1985.
2) The news article of the mansion fire and selling of prime land.
3) The Doc's resistance to do crime or disrupt the timeline significantly.

All these would have allowed and motivated Doc to have the money collected in the modern (1985) time and using funds and means that were legitimate & passive, such as getting the money from present day collectors. (Realize that some of the money would be worthless or easy to get.)

Other clues in-movie:
4) The tape used to label all the slots is all ripped from the same roll and in sequence, tagged with the same pen, and consistently across all of the slots. This implies that the slots were tagged all at the same time.
5) The case perfectly fits the collective length of the accumulated bills meaning that Doc had all the bills prior to getting the case.
6) The sheer range of bills would either mean numerous time jumps or visiting a currency collector. Because that many time jumps would be MUCH more costly (even with Mr. Fusion) and risky, the relative ease to get the bills from a single (1985) source makes much more sense.

So - In my mind, this just fits Doc's character, the clues in the film, and is the simplest explanation to how one could easily get the money all in 1985 prior to any convoluted time jumping, robbing banks, or non-canon plot.

I may be wrong but I believe that case is visible briefly in the background of the parking lot (first test) scenes.


If he obtained all the bills in a single time period: the ones from earlier dates would be excessively aged and brittle. To buy enough mint or near mint bills to fill out his case as we see it, he would have to visit a LOT of collectors' shops, only buying one or two bills at a shop.

Its a process as tedious as: making multiple time jumps to do an elaborate series of trades in antique currencies and precious metals.

To quote Doc when he is briefing Marty in 2015: "I went further ahead in time to see what happens, and, traced it back to this point."

How far ahead is: "Further" ahead? He does not say. What he does say he has done: He spied on the McFly family for a while, had his blood overhauled, hover converted the DeLorian and installed the MR. Fusion. In Doc's personal lineage, he was gone for a quite a while. At any rate: If he got his hands on tech to make his car fly, and tech to turn banana peels and beer cans into nuclear energy, it's not hard to imagine he got something to accurately replicate currency from before when they had things like, watermarks and magnetic strips. Notice: the latest time period he has money for is 1985.

  • You don't need to trade in precious metals. You just buy some bills from each time period, then travel to that time period, walk into a bank and ask them to swap your bills for a nice neat new stack.
    – Valorum
    Sep 1, 2017 at 1:33

When I was a kid I remember seeing a scene that had Marty asking, "What'd you do rob a bank?" and Doc gave a pause and didn't say anything. That's when in the movie Marty gave him that funny look. I'm not sure if it later got edited out but I remember it from the older version on TV. Not sure if anyone else remembers that but I do.

  • 2
    Hi, welcome to Stack Exchange! Please could you edit this answer to make it a bit clearer what your actual answer is? If you think this suggests the Doc robbed a bank, that would be an answer to the question, but if you're just commenting on this scene you remember, then it would be better suited as a comment.
    – Rand al'Thor
    Dec 1, 2016 at 12:14

The currency from the past could have been purchased at a currency collector shop. But obviously money from their future would have to require time travel.

When I was a kid I remember seeing a scene that is now gone that shows a $50 bill from the future and it looks eerily similar to the design change that was actually done!

I do not know what happened to the scene where they show money from their future and yet you can buy a prop of the futureistic currency online that matches my memory of the missing scene. Anyone else notice that? Or maybe it's still there but I keep missing it because it flashes on screen too fast?

  • 1
    This seems very speculative.
    – Valorum
    May 4, 2020 at 7:19

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.