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Deltarune, also known as Deltarune 2 Go, is the book sequel to the 1997 theatrical film Undertale. The book was based on a story by Dan "Get In My Van" Schneider and published by Toby Fox. The book was published on October 1, 1998, and was never adapted into a film.


Good Burger's in trouble again! This time, it's been selling Ed's Sauce without a license. The only way to save the secret sauce is to get it approved through a taste test. The problem? The pot of Ed's Sauce is empty and only one person knows how to make more! Where's Jesus when they need him? Jesus is trying to give a customer her sixty-nine cents of change... In the Dark World. Determined to return the money, Jesus is following the woman around the world... and straight into a video game plot. Luckily, Jesus' friend RiceGum is also following him. With Jesus and RiceGum on the case, this adventure is sure to be... well, an adventure!


  • Jesus H. Christ
  • RiceGum


  • This is the first book to be released as a sequel to a Nickelodeon film.
  • Timmy Turner is referenced at one point, being noted as "an average customer that no one understands". Butch Hartman would later steal this line for the Fairly OddParents! theme song.
  • There is foreshadowing to Whitey and Roxy, another piece of Undertale sequel media that went straight to video in 2002.
  • Dan "We Got A Screamer" Schneider allegedly claims that Nickelodeon turned down the screenplay because it was too ahead of it's time.
  • Toby Fox later bought the rights to the Deltarune name, and his original video game plot and characters, and would turn it into a video game under the same name. Although it features characters from his mediocre project known as Undertale (not to be confused with the movie), Fans praised it for staying faithful to the original video game plot found in the Deltarune 2 Go book. Mr. Fox has said in an interview that "It was a shame [the game plot] didn't get to see a big screen audience. I made sketches for the characters and locations back then, and when I started work on Undertale (the indie game), I looked into my options of legally reacquiring the original work I did all those years ago."