What Is the Connection Between Deltarune and Undertale?

TL;DR
Yes, Deltarune and Undertale are connected, but not as a straightforward sequel or prequel: Deltarune is a parallel universe where the war between humans and monsters never happened. The characters and game mechanics stay consistent, yet clues break the timeline both ways, since Undyne has both arms (suggesting a prequel) while monsters live on the surface (suggesting after Undertale). Characters like Sans appear to have crossed over and are aware of the alternate timelines. Read on for how the imaginary-game theory ties it all together.
Transcript
you know the great thing about multi-part theories they actually give me one of the rare opportunities I have to answer some of your biggest questions about earlier parts in the theory which is pretty exciting actually so last time we talked about how the mysterious dark nerd world that Chris and Susy explored during the most inefficient quest to f... Read More
Key Insights
- 😫 Delta Rune is set in a parallel universe where the war between humans and monsters never occurred.
- 👾 The game mechanics and character personalities remain consistent between Undertale and Delta Rune, while the differences result from alternative timelines.
- 😵 Characters from Undertale, such as Sans, have crossed over to the Delta Rune world.
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Questions & Answers
Q: Are Deltarune and Undertale connected?
Yes, but the connection is not a normal sequel or prequel. Deltarune is presented as a parallel universe to Undertale where the war between humans and monsters never happened, so the characters and mechanics stay consistent while their lives differ. Characters such as Sans appear to have crossed over into the Deltarune world and are aware of the alternate timelines.
Q: Is Deltarune a sequel or a prequel to Undertale?
Neither in the traditional sense. Monsters being out on the surface makes it seem to happen after Undertale, but details like Undyne having both arms suggest it comes before. Because the evidence points both directions at once, the video argues it cannot simply be a sequel or a prequel.
Q: What is the connection between Deltarune and Undertale?
Deltarune is treated as a parallel world to Undertale in which the war between humans and monsters never occurred. Character personalities and game mechanics carry over, and characters like Sans have crossed into this world while being aware of the alternate timelines.
Q: Why would Susie go along with Chris's game if it was all imaginary?
Susie does not buy in at first, running from Chris and ignoring Ralsei's prophecy, and she is only won over once the fighting starts. She enjoys acting out her violent fantasies in a safe environment with no consequences, the kind of player the video calls a 'murder-hobo.' Her final reaction is that of someone snapping out of an immersive game world.
Q: Isn't saying everything is just a game a lazy explanation like a dream theory?
The video says it would be lazy only if there were no proof and no narrative consequences, but here there are both. Enemies are checkers with legs, characters fight with pencils, and Ralsei, the only Dark World member of the party, vanishes when he faints and leaves just his hat and cape, implying he is not real while Chris and Susie are.
Q: What evidence shows the Dark World is Chris's imaginary game?
The Dark World is built from things in Chris's life: the Darkners are toys, weapons are school supplies, and story elements come from people around Chris. The first save point already has Chris's name, described as a place she has been before, and the game states that only eyes blinded by darkness can see the way, meaning we are seeing with imagination rather than our eyes.
Q: Why does Chris act differently in the epilogue of Deltarune?
The player, represented by the mysterious voice, has influence over Chris but is a separate entity from them. Chris's behavior in the epilogue, including ripping their own heart out, reflects a rejection of the player's control and a desire to make their own choices.
Summary & Key Takeaways
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Delta Rune is a game that exists in a parallel universe to Undertale, where the war between humans and monsters never occurred.
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The game mechanics and character personalities remain consistent between both games, while the differences in the characters' lives result from the war not happening in Delta Rune.
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Characters from Undertale, including Sans, have traveled to the Delta Rune world and are aware of the alternate timelines.
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Chris, the protagonist of Delta Rune, is influenced by the player but asserts their own agency, highlighting the separation between the character and the player.
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