Is Undertale Sans from Deltarune's World? | Deltarune Theory Discussion 

**Vague MOTHER 3 SPOILERS** from 9:25 - 10:20. Work on the big Alphys analysis is still underway! For now, enjoy a short vid discussing a popular Undertale and Deltarune theory that's been around since 2018. If you want to see how work is going and help support me, my patreon is at patreon.com/dorked. Feel free to comment to suggest other video topics and/or Inverted Fate tracks! You can read IF at invertedfate.com/chapters and also support me on Ko-Fi at ko-fi.com/invertedfate. Also, let me know how often is cool for OST uploads because I Don't wanna alienate the folks here for video essays. Maybe one a week? Check out my other Analysis vids here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-4VfHhBh1c8c.html Read Inverted Fate at: invertedfate.com/chapters Inverted Fate OST: soundcloud.com/megaflamehedge/sets/inverted-fate-ost Sewer Fundraiser: gofund.me/6989ad02 Read my Kingdom Hearts fic, Antipode at: archiveofourown.org/series/18376

It's really worth talking about the fact that not once so far in Deltarune has Sans said "Papyrus". Only "my brother".

"Sans is Sans" truly an Undertale Theory 4 years in the making

I dig the idea that while getting isekai'd sent Sans on an existential depression, Papyrus thought of it as great escapism. Maybe he saw the underground as a chance to start over, a real magical world where he could become a great and popular hero! It fits given how, in Undertale, Papyrus is one of the few monsters that couldn't really care less about the surface.

I have a bit of an issue with Sans being from Deltarune, and that's Papyrus. You already went over Papyrus meeting a human in Undertale, but another thing is that he doesn't know what the sun looks like in Undertale until the pacifist ending. If the skeletons are from Deltarune, then how does Papyrus not know what the sun looks like? It makes him seem like a total idiot that doesn't know what basic fundamental objects look like. I guess amnesia could be a possibility but that feels unsatisfying

Honestly, whilst there is Papyrus not knowing things he should if he came from a surface world, it could just boil down to the sole factor of losing his memory. Hell, we could also say Sans lost his memory as well, but managed to regain bits over time.

I can't believe you managed to go the whole video without saying "But hey, THAT'S just a theory!" I guess something else that'd be interesting to bring up is Sans' Ice-E crossword; Ice-E is practically nonexistent outside of Sans' crossword puzzle in Undertale (His only appearance is specifically through Sans), but he's much more prevalent in DeltaRune, being the mascot of a pizza place (This point might be a bit iffy, but the Ice-E puzzle appealing to kids does line up pretty well with the whole pizza place thing) Pretty great video overall, this topic's definitely an oldie, but I still enjoyed its analysis

An interesting thing to note about Toby’s different rules statement is that sans can bleed supposedly, with Susie’s statement “everyone bleeds” this could be a better connection to this theory.

An obvious solution that im seeing pointed out in both the comments and on some tumblr blogs for the papyrus flaws in the otherworld sans theory, is that only sans is from another world, and Papyrus is indeed the papyrus from undertale, this not only solves the previously mentioned flaws, but also solves the whole Sans bleeding thing, where Papyrus does not bleed. Besides, river person said beware the man from another world, not "men", its singular

I like to believe papyrus took the opportunity to start a new life in undertale since it seems he didn't really have any friends in deltarune

When ever sans says “I’ve never seen you before” or whatever. He winks.

I'm really curious to know how Papyrus will be like in Deltarune because if your really think about it, the majority of what makes Papyrus' character revolves around the Underground. Sure maybe this core cheerful personality would be present as well as his funny quirks and insecurities but I wonder how he'll be like in the context of Deltarune. Like the only reason he wants to be in the Royal Guard is because he wants to be popular and make many friends, but there is no Royal Guard in Deltarune. The only reason he makes spaghetti (and other pasta dishes) is because Undyne didn't want him to join the guard because she thought his kindness would get him killed but she still wanted to help him and inspire him to do something else, but with no Royal Guard there is no making pasta for Papyrus. His battle body was made for a costume party and Papyrus uses it as his main "armor" to join the Guard, but with no Royal Guard there may not be no battle boy so Papyrus would be wearing normal clothes (or his cool dude outfit). Not to mention that with no Mettaton in deltarune (at least not the Mettaton we are familiar with) that means no MTT products that Papyrus uses. I'm just saying that Papyrus will not be the same Papyrus we all know and admire and love, either he'll probably be younger or, and let's pray it don't happen, he ends up like his concept design were he is a fedora wearing neckbeard with zero redeeming qualities (We all know Toby be reusing his old concept art like how Sans got his visor for the concept art when running the game spot from the Xbox version of undertale).

Well, my current interpretation is that Gaster is actually a Deltarune character that was foreshadowed in Undertale, and with his implied connection to the skelebros, maybe…

I've always had issues with this theory just because of how.. retcon-y it feels, and how many details don't line up with that in Undertale, like you pointed out. Obviously there's a ton of meta jokes around him in Deltarune, but it just didn't feel right to me. Not to mention, the narrator's meta jokes feel like a narrator, I'm a firm believer that Deltarune has no in-world narrator like Chara in Undertale. One theory is do think could hold fruition though, is that perhaps both Sanses made a connection with each other. Think about it, the theme for Gaster - the goner maker guy who I'm 99% sure is Gaster - is called _ANOTHER_ HIM, while Gaster's theme in Undertale is called "him" in the files. If there's two Gasters, why not two Sanses? Maybe they saw each other once, for how long and if they even spoke we don't know, but that machine in Sans's lab still has a very unknown purpose. Perhaps that had something to do with it? Hell, maybe Gaster is the only one who actually figured out anything about Deltarune, and simply relayed some info from Sans! But this is all just speculation at this point, I do think we'd need more evidence to reach a sound conclusion.

I'm gonna write this speculation ramble here before I forget, but basically I'm on board with the Deltarune timeloop theory, despite how tragic that theory might be, it holds some water mostly because of the talk of "fate" and our actions not mattering. Anyways, I think that at some point towards the end, some characters will catch on to the time loop and will try to make their escape to another world (Undertale) by building the machine we see in Sans's lab. However, only Sans and Papyrus make their escape at the last minute before the loop happens and they don't get out unscathed, their memories are mostly wiped. The only reason why they remember anything at all is because of the objects they brought over with them. I honestly think Sans's is the one who remembers the most, not because of any power, but because he seems to have more deep bonds and fond memories of his time in Deltarune while Papyrus was mostly a shut-in who will likely only meet Kris once or very few times. Sans's has already seen Kris twice, and it's not a stretch to say they'll meet again in the next chapters, so that could explain why he knows what a human looks like. It's also possible that Sans's really did forget Toriel's name, but knows's how she looks like (photo album perhaps?) and vaguely remembers her voice, hence why he connects with her so quickly and makes that promise with little hesitance. It's also possible, but a little dumb, that jumping worlds works similar to resetting in regards to how much memory a character can retain, and maybe they made the jump too soon without seeing the end fate of DR. That would probably prompt Sans (and Paps if he's the second one) to find a way to fix the machine and ultimately give up when proven impossible. Papyrus is the one that feels like an odd piece to the puzzle, especially since I'm claiming that he remembers the least, but I don't think this infantilizes him. The thing is, he DOES remember, he just doesn't have many important ties to Deltarune that makes him miss his old home. In fact, I think he sees Undertale as a fresh start, somewhere he can finally go out and be friends with everyone, a magical place! I also think both brothers are keeping these memories to themselves, since there is a slight disconnect between the bros in the game (King Papyrus ending for ref). He also admitted to having nightmares (possibly the DR ending?) in the game and hints to being aware of resets, at least Frisk having "a power" to undo their actions. I know that some people suggest that Sans is the only one who jumped worlds and Papyrus is from Undertale, but the Snowdin Shopkeeper literally confirms that BOTH of them showed up so, that theory doesn't make sense (unless y'all wanna argure that her memories got altered somehow asldkfjlakdjf). The only hole I see with this ramble is that, if they made this jump, then what happened to the original UT Sans and Paps? Did they literally just get replaced or swapped? Spoof out of existance?? Did they ever even exist XD I could ramble more but I think this is long enough- thoughts anyone?

I think that one of the big plot twists of Deltarune will be that the Papyrus of Deltarune will not travel with Sans to Undertale(Or maybe die), that would be the reason that sans bleeds and papyrus doesn't, and would justify the dialogs of Sans during the end of the pacifist route saying that he can't save him. Also I don't think that Papyrus is the knight, I think he's the man behind the tree, being foreshadowed if i'm not mistaken in a piece of Undertale merchandice.

Just a reminder despite the fan interpretation papyrus makes several references to other timeliness for example in a pacifist ending post content papyrus says "I'm still not in the royal gaurd this truly is the worst possible timeline"

what comes to mind for me is sans' line "Don't tell that to the other sans's" during his fight, it could just mean the sans's from other timelines, but it could also mean an entirely other sans.

Some of the inconsistencies with Papyrus could be explained as Papyrus and Sans lying.

Great video! This theory has been in the back of my mind for a while, and I'm glad to see more videos covering it. My best guess is that the sans we see in Undertale IS from Deltarune's world somehow. It's the only thing that really makes sense to me, since sans says numerous times that he wants to go back somewhere, but that it isn't the surface either. I just can't think of any other places that aren't located in the underground or the surface in Undertale, which leads me to believe it has to be a different universe like Deltarune. Just my guess though, and we'll see more with more information. As for Papyrus fitting into all this? Who knows LOL

I don’t think you should be so quick to dismiss the possibility that Sans is a Darkner. After all, Sans displays numerous characteristics that set him apart from the rest of the monsters in the Underground. He bleeds. His death doesn’t make the kill counter increase. He lacks an overhead health bar. He looks nothing like his brother. Sans being a Darkner can account for all of these facts. While we have yet to learn how a Darkner could manage to persist outside of a Dark World and beyond the range of a Dark Fountain, that doesn’t make it completely impossible. After all, one of UT’s general rules was that only humans can achieve high levels of determination, yet Undyne the Undying eventually comes along as an exception to that rule.

Halfbreadchaos is awesome!

If we go by the Roaring Knight Papyrus theory, it's possible Papyrus will only meet Kris within the Dark World, and consequently not recognize them as a human but simply as another lightner. Or, as trope-y as it is, Papyrus having forgotten about Deltarune via some amnesia could genuinely be a way of using the "Forgettable" line in a different way. Alternatively, Undertale's Papyrus is just _really_ good at acting like he doesn't know things. He does seem allude to knowing about "endings" and that we can reset a couple times.

wow, there were a lot more point for the theory then i initially thought i am kind of confused about papyrus though. if sans originated in deltarune and came to undertale, that would explain how he "showed up one day", but that also implies that papyrus came at the same time. and the gap between personalities in games is very weird. one thing we know for sure about papyrus's character is that he looks up to undyne very much and will do anything to capture a human to impress her. whats strange is he doesn't seem to be like that at all in deltarune. in deltarune, hes a shut in who doesn't see people often. i would accept something along the lines of he had a change in heart after he went to undertale and met undyne, and aspired to be like her, but in deltarune undyne is a very similar person. she still has the same personality and ideals, with the police instead of the royal guard. surely, he had heard or even met her before. which would either mean he had no clue of undynes existence in deltarune which means he even more of a shut in then we thought, something else is going on that is completely different then this theory, or, most horrifically, he never looked up to undyne. he wanted to enter the royal guard for his own reasons, and was putting up an act. this seems so impossible, so out of character for him, and saying that he just acts the way he is in all of undertale is crazy. but, remember who his brother is. his brother, who has knowledge of different worlds, the power to kill a human hundreds of times, who had perhaps know about a man who was scattered across time and space, and came off as a goof who knew nothing put pranks. perhaps, the biggest deception that he could possibly put up, the one he has been for all of undertale, was his brother. what if they were both like that, and papyrus has some other goals. and that concludes my stupid theory with a million plot holes that i came up with on the spot! thanks you, thank you. wow at first that was a question to myself and it evolved into an entire theory

Honestly, this is a theory I really do like, despite the couple of gaps. For a while I’ve been entertaining the idea of, as a bit of fan service (not that kind), that there’s going to be something of a subplot where Toby delves into Sans/the skele-bros’ origins, even if it doesn’t directly connect to the main Dark World plot. It certainly _seems_ like what he’s getting at, after adding the “Don’t Forget” note to Sans’ secret room. As for Paps, maybe _only_ Delta Sans was brought over, while Delta Papyrus wasn’t? Certainly dark, but… considering Undertale Sans’ outlook on his situation, I wouldn’t rule something like it out, personally. I can definitely agree that Deltarune being revealed as a traditional prequel would be a bit iffy by contrast, considering Deltarune is Toby’s longtime passion project, and how he wants people to view it separately from Undertale. And, yeah: Paps plain not showing up, or having amnesia in Undertale would both kind of be a cop-out, in my honest opinion (plus, the latter might raise unfortunate implications if his amnesiac personality is different from his “original” one). Sidenote: The Papyrus Knight theory is actually another one I really like! Especially since it’s always come across to me that Papyrus was Toby’s favorite of the two bros, I feel like everyone’s favorite Fox has got something special planned for ol’ Paps. At this point, I might be buying Chapter 3-5 solely to see what the heck Paps turns out to be like! (Okay that’s a joke but still ;D) -As for whether or not I’m hoping he has a fedora… that’s another story.-

YEEEEEEEAAAAAAHHH This is something I've been convinced of ever since chapter 2 dropped, and while there are definitely some set backs (Papyrus as a whole is the biggest detriment to the theory), I still feel it would explain so much of Sans' character, his dialog and actions, and I'm glad I got a video I can share with people that lays down the evidence in an organized manner, thank you very much!!

Maybe Sans is Sans, but Papyrus isn't from Deltarune. I can see Sans forming a bond with the AU version of his brother. Especially if he's the reason AU Sans is gone. This is a lot less contrived than any of the other explanations. And given that Sans went and got himself stranded, it make sense that he'd want to leave his original brother out of whatever experiment or gamble landed him in Undertale.

i think sans's dialogues in undertale pretty much confirm that he and papyrus came from a parallel universe. That this universe is deltarune doesn't seem very feasible to me, like you have pointed out in your video. I think this is to introduce the concept of alternative universes and that people don't get confused thinking that deltarune was the same world as undertale (although there was a lot of confusion even so) anyway, i'm a big fan of the theory of two gasters, one from undertale and one from deltarune, and it seems to me that this could be a more logical connection between both games than 'oh look the skelebros come from deltarune but they have amnesia lol'

don't have much to say about the theory, but it's also notable that papyrus's text barks are also in deltarune's sound files!

i love sands from nutdealer great video

My biggest fear with DR is it having an unfulfilling ending. Only one ending, the mother 3 connections, it scares me greatly

for a long time, i have had a theory that gaster accidentally found the deltarune world (why he isn’t in undertale when we play it) and brought in the player that controlled frisk into kris to seal the dark worlds. what are your thoughts? it has evidence, it just makes sense in my eyes, but feel free to point out loopholes.

I think that maybe if the Deltarune theory is true, then both brothers are from Deltarune BUT due to some misunderstandings, they assume the other is originally from Undertale. They both still see eachother and brothers, but they both might try to keep a facade of being originally from Undertale. We've already seen Papyrus do a facade for when people are around vs when he's alone

I think it would be funny if sans in the dark world just looks the exact same because he's too lazy to think of a alternative outfit

There’s like only one hole in this theory and it’s the fact that we still don’t know if monsters bleed in DT or if they “fall down”

the feeling of watching my favorite undertale au creator repeatedly reference my favorite undertale/deltarune theorist is a great one indeed. in all honesty, somehow wasn't expecting dorked to know halfbreadchaos, and it makes me happy that dorked does know them

I kinda do wonder, it does seem that so far everything is leading to Sans being the same we meet in Undertale but the most that breaks this theory is Papyrus. But what if, Papyrus was the same and the reason he seems to not remember anything is that is his way to, as they say, keep a low profile? In his own way of course, which leads to him not sounding very smart at times but also contradicting himself other times because he probably too excited about something or he a bit too honest for his own good.

3:50 I would’ve said the $?$! Squad.

Nice video! (also, I loved your Sans voice lol) 2:57

I know the man who speaks in hands was assigned to gaster by the fandom but it seems just as likely it's about sans too: his face never changes, which leaves body language to decipher his emotions. He also uses his hands to direct bone attacks, unlike papyrus who stays still during battle.

Always been a fan of this theory, so it’s nice to see a video about it!

I've always found it interesting how Sans just suddenly appears/moves into the town as soon as all the dark world stuff starts, it seems like he has to have some kind of ties to it. he just kinda appeared in Undertale one day too, maybe this is just something he does? hop between worlds to make his new home?

Decent analysis video! Thanks for uploading!

i think that everybody is overthinking it and sans just has a portal to another universe casually in his house

im sad that i got to know this voice because of von dohj ;-; now ill just imagine her talking in these type of videos like its her hobby XD

Also, Sans is the only monster who bleeds in Undertale, and Susie and Lancer in Chapter 1 mention that everyone has blood (in the part where Lancer brings a bucket so that when they fight the blood falls there).

something else is that papyrus doesnt recognize the sun at the end of true pacifist but sans seemingly does. this could be explained by sans having an interest in astronomy but the fact that he has that interest despite living underground is something to note in itself. sans' abilities all seem to be related to space as well (teleportation, gravity control) which makes him the perfect foil to our time powers. he pranks us across time AND space after all. it would make a lot of sense thematically if he was the man from another world

I'm glad to see more people discussing this theory, I think it's pretty underrated for so much sense it makes and I'd really love if turn out real, I think it's likely. Anyway, I don't think him not calling tori by name is good evidence against the theory, let's be honest, it would be really weird for you to walk up to someone who doesn't know you and just call her by name I think. sans is just really good at keeping up appearances. I don't think sans coming from deltarune means that deltarune itself is going to have a bittersweet ending, It is possible that deltarune has a happy ending but sans left deltarune before seeing the ending because the situation was REALLY bad, so he doesn't know if everything turned out well or not and that can be really interesting but this is just an idea

great video! really got me thinking

Something that sticks out big for me is that we still haven’t seen muffet in the light world at all. Haven’t seen anyone talk about it

Well, that's actually quite an interesting theory, and I really love how you explained it! (If it doesn't work out, at least there's the IF!Sans Backstory...)

Hi Dorked! Really quick comment but I must say that I wished you put a spoiler notification for Mother 3 at 9:46. [MOTHER 3 SPOILERS] The roaring and what happens at the end of Mother 3 are huge mirrors of each other, I feel. It seems that making a simple statement of "DR might be like the ending of Mother 3" can allude to the entirety of Mother 3's ending for someone who hasn't played. I'm so sorry for being a concerned nerd about this but I know that there are a few people out there who haven't played Mother 3 and it is honestly one of my favorite games out there. It certainly has played as inspiration for Toby's games. Thank you for reading and I really enjoyed this look into this matter. I always just thought of it as "well it has to be the same sans, certainly?". It might go deeper than that for sure.

Intrtesting detail to support the fact that characters from undertale might have originated in deltarune is the fact that so far, some of the characters from deltarune appear as gaster followers in undertale. While every character hasnt been introduced yet, its still a possible connection. This would also explain why characters such as monster kid and donut man appears as regular people too, because the gaster followers they resemble are not from the same universe. This also connects to the flower bird thing that resides in the library in Deltarune, but not in undertale. Its an intresting connection...

6:58 In Ch1 he does say that he befriended Toriel LAST NIGHT, so this probably means that they didn not really know each other properly until that night.

I mean, Deltarune was conceptualized before Undertale, and Toby never stopped wanting to make it, so it’s totally possible that he planned for characters to be directly connect to Deltarune all along.

Amazing video as always! Toby really did raise a lot of speculations making Sans in deltarune look identical to his Undertale counterpart. Is this only to troll us? Or is there something more to this? Can't wait for next chapters to learn more about this and see how right or wrong all the theories will turn out to be. Keep up the great work!

ngl i think at minimum sans came from deltarune somehow. he's the *only* person to share an exact theme song with everyone else. Toriel and her house have completely remade themes, meanwhile when you go to Sans's in chapter 2 sans. is the exact same as it was in undertale.

I *REALLY* love the point about amnesia you've made. Many fan-theories fall into the pitfall of making "amnesia/memory loss" the knot that helps the theory not fall apart. "Because the amnesia just coincidentally took the memories that'd make my theory fit, while it coincidentally didn't take the memories that make up most of my theory" is how Ifear most of it. Meanwhile you seem aware of that, as you mentioned the possibility shortly but called it unsatisfying. YES, exactly, it's very convenient and seems like a duct-tape on something just to force it into fitting together. With there still being 5 (or more?) chapters of Deltarune coming, it's very possible we still miss puzzle pieces that'd make these fit together more rationally than just some contrived amnesia. And I really respect that you noticed that and didn't fall into this pitfall. Earned my subscription.

i needed a good ol' sans theory. been a while since a rly good one has popped out and damn this is fun

You mentioned Sans saying he's new in town and that 'new' can be relative, but I've also seen the point brought out that Sans could just be lying that he's new in town, as a way of testing if 'Kris' is the one talking with him, or someone else. That said, I've already been inclined to the 'UT!Sans is from Deltarune' theory. Also as for the Papyrus issue. Lately I've been going back to the 'Papyrus is Gaster, but Gaster himself forgot who he is' theory. I probably need to watch a let's play of DR again to check I'm not misremembering, but if I do recall correctly, Sans has not yet referred to Papyrus by name, and has ONLY referred to him as 'my little brother.' The biggest indication it IS Papyrus is being told you hear 'the distant trousling of bones' when you check the skelebros' door. So I wonder if being so weird about mentioning Papyrus' name, and no one else in Hometown seeming aware of Papyrus' existence, could be foreshadowing? That said! It speaks volumes that my biggest piece of evidence for this specific theory is an overwhelming lack of evidence about Papyrus overall. It also becomes extremely complicated when you try to make it co-exist with 'Gaster was originally from Undertale'. Not impossible, but there are almost certainly simpler explanations to both.

Maybe the reason there is a disconnect is because sans is the only one with the ability to remember besides flowey who we haven’t seen and the player. Even in undertale papyrus never once mentions anything about the past before they went to Snowdin. It’s very possible that the only thing papyrus knows is that sans is his brother and he knows this because it is consistent across all timelines. So the change in timeline may represent a younger papyrus or maybe one that’s the same age who just is rattled from the timeline shift

This video is amazing as usual

Maybe just Sans is from undertale, maybe at some point he decided to go to deltarune's timeline and that's why papyrus hasn't appeared yet, cuz sans is trying to get him to deltarune, idk just though about that

Just poppin in a little comment to please the higher powers of the youtube algorithm, I wish I had something good or inetesting to add but there's not much I have to say other than great vid as always and man, I miss papyrus. That "forgettable" description always hits me so different

If Sans really is from Deltarune, that would make the premise of Inverted Fate even funnier, because then he'd have been ripped from not just one world, but two!

FINALLY SOMEONE TALKED ABT PAPYRUS’ ABSENCE IN THE GAMEEES also if you knock again after ch.2 it says ( faintly, faintly, a trousle, growing further away.) which is worrying

If Sans is a fragment of Gaster or related to him, it could lead to a shared memory phenomenon. Sans could be different people in both games but recall some memories of each other. Wanting to go "home" in Undertale isn't quite explained by this though.

The go home line seems to me like Sans wants to go back to his old home in the Deltarune timeline with his found brother Papyrus in the Undertale timeline to finaly live in peace with no resets and no genocide.But the portal machine broke and now Sans is stuck inside the Undertale timeline with no way back to his original home.

Oh my fucking god I just got the eggs husband joke it’s been years since chapter 2 and I’m just getting it now I’m so dumb

Oh! I’m glad you watch HalfBreadChaos! He’s got a great channel! Gruffet the spider might also be a good one to watch.

Y’know, it’s entirely possible that Papyrus might just be a baby in Deltarune. And when Sans moved dimensions, Papyrus was still a baby. It would explain the discrepancy, without ruining Papyrus’ character in Undertale. Those are my thoughts on it.

I dunno, I can't unhear the phrase "I'm with you in the dark" sneaking into the Snowdin Town theme, which really sets off a red flag for me given how frequently the songs from Deltarune have bits of Don't Forget show up here and there. Then again, I'm not an expert in music and I never see anyone else mention it in their Sans world-hopping theories. Is it just me? Am I hearing things?

I think he is a separate skeleton but one that knows about the existence of parallel versions of himself and the "player". Like how the Undertale one knows about saving and stuff. He sees the Kris and the player behind and figures you've probably met another version of him at some point.

I kinda have this headcannon where Sans and Papyrus leaves Deltarune to Undertake after the Roaring happened.

pov u came here after the summer newsletter came out😭

Plot twist, Prunsel replaces Papyrus and it's just playing an mp3 of trouseling bones

In the Genocide route, Sans tells you to keep pretending to be a human, implying that he has an established idea of what a human is, and genocidal maniac does not fit.

I'd love for a young Papyrus to be a party member and a secret boss in Deltarune.

The idea that sans is from Deltarune relies so much on the idea that Gaster will play an active role in the story. And personally I think anyone that thinks he’ll appear period is Fred in a Pup named Scooby Doo

Plot twist: The Sans in undertale is from Deltarune's world But the Sans in Deltarune is from undertale's world

what if the Underground is a dark world, since the warp door only shows up in one? would that imply that the "powerful spell" that "trapped everyone inside" could have connection with it?

Wait what causes Papyrus to call himself a brutal guy?

If Papyrus looks exactly the same as he does in Undertale like Sans,then we'll have our answer

6:45 Oh huh. I just realized you casually referred to the Snowdin Shop Bunny as QC. I was so confused for a second before I realized duh, if her café in Deltarune is called "QC's", of course her name is QC, and that should carry over to Undertale!

My immediate thought wrt Sans not remembering us in Deltarune whilst we (the player, not Kris) remember him is that for him the chronology is backwards. Sans is experiencing DR before UT. Doesn't necessarily explain Papyrus having never seen a human, but honestly it doesn't feel very strongly like papyrus traveled between worlds (at least whilst remembering). Could be a case of Sans getting a new Papyrus, or it could be an amnesia situation.

There is one more piece of evidence you missed: Blood. I can't remember the exact scene but in Deltarune Susie mentions that "everyone bleeds". There's also other times she mentions blood. At first glance this is just her being a delinquent but in Undertale we learn that monsters dont bleed. They are magic and turn to dust. So its fair to assume that in Deltarunes world both monsters and humans can bleed which also ties in with monsters in Deltarune not being able to do magic in the light world. Now heres the thing: Sans is the only monster in Undertale that is shown bleeding in his death animation. The popular fan theory prior to Deltarune was that its Ketchup but in this context it could have a completely different meaning. Hope this helps! Bonus theory: Since Papyrus doesnt bleed in Undertale maybe maybe they instead swapped places with their Deltarune counterparts? So Sans is from Deltarune in Undertale and in Deltarune Papyrus is from Deltarune. This actually perfectly explains their different personalitys. Papyrus in Deltarune is a shut in that we've never seen while in Undertale he is very outgoing. Similary Sans was depressed and lazy in Undertale while in Deltarune he even runs his own shop. Honestly im kind of convinced now. It would be an honour if you responded. This seems to fit to well. Edit: Just read some other comments and this theory would kind of solve Papyrus not knowing about the sun in Undertale but Sans knowing about it. Damn. I guess it all depends on how Deltarune Papyrus turns out to be. Still really interesting.

watching this now after the recent newsletter revelation about the font bros coming from somewhere with green grass feels oddly prescient

Sometimes i wonder if Papyrus actually doesn't exist in Deltarune and Sans is just pranking us. I wonder what Papyrus's job is going to be. Aside from that I wish that we learn more about Hometown's history in future chapters. In Undertale we don't really know much about the history of the underground apart from what's relevant to the main plot. A few more details about the history of the places there and the pasts of the characters would be nice.

The fact that he says "How are you, kiddo?", in deltarune is a an interesting choice of wording by Toby. Instead of "Who", he says "How are you", implying that he somehow remembers us, in some form or another.

I think something with the Roaring will happen and Sans and Papyrus could escape somehow

Just imagine if undertale is just a game inside a deltarune, like you can to see a folder ‘EPIC GAME!!!!!!’ Where the final boss have rainbow wings(like asriel) so yeah

Nice video

OMG! i didnt even notice that line in sans"s battle! that wgat if you dont do TP before? your so smart!

Deltarune's fountains and Gods thing really reminds me of Mother 3 where they talk about powerful dragons and magic important needles. *[SPOILERS]* In Mother 3 the apocalypse happened but fortunately they didn't die. Comparing Deltarune and Mother 3 has surprising similarities where this predecessor games are completely different and new but still connected with the world building.

8:17 Year late and probably already commented, but for Papyrus not recognising Kris, maybe he’d only see them in the Dark World, therefore not associating the two together. (Maybe he’ll refer to Kris as Lightner and not Human as being a human isn’t as much as a big deal in Deltarune)

One point I saw in JaruJaruJ's video (he made a similar, more expanded theory after you) is that Deltarune Papyrus is probably dead, and Sans went to the Undertale world alone, perhaps BECAUSE Papyrus died. I think this is the most likely reason in general for Sans to wish to go to another world, be it to find a method to save him or escape the calamity that got Papyrus killed. It opens up the question of what the hell happened to Undertale Sans and that... well maybe Jaru himself can explain his thoughts on the matter. I enjoyed how he unraveled it in his video.

8:28 or he was in the undertale world before moving to hometown because hometown isn’t the only town in deltarune

I'm a fan of Jaru's crackpot version of this theory in which Papyrus dies and Sans leaves the Deltarune world behind with the help of the Lancer Fan Club after the Roaring begins.

PAPS could have had a form of memory wipe after he and sans were thrown into undertale from deltarune. Also keep in mind if PAPS and sans did just "show up" in undertale post deltarune and PAPS is the knight then sans IS definitely helping him and would explain why they BOTH just showed up there post deltarune. and IF PAPS has forgotten what a human looks like then its safe to say he's NOT a good person, he's probably a NICE GUY like "flowey" in deltarune and the reason he got his memory wiped is because he got his [butt] handed to him HARD by kris and susie and/ or ralsei. which would turn him from "THE KNIGHT" [the bad guy with a fedora] into "THE GREAT PAPYRUS" [the lovable goof]. just my 2 cents.

It's interesting to me that Sans's theme, "sans." is just. Verbatim the same song from Undertale. Completely. Vaguely makes me wonder if we could see "It's Raining Somewhere Else" or "Song That Might Play When You Fight Sans" again. Maybe even with reworked titles, like "It's Raining Here" or "Song That Plays When You Fight Sans".