Undertale: Beyond the Void

Undertale: Beyond the Void is a 2032 fantasy adventure film based on the 2015 game of the same name by Toby Fox. Directed by Nia DaCosta and co-written by DaCosta, Derek Connolly, and Rick Jaffa and Amanda Silver, this tells the tale of Frisk, Leon, Asriel, and Monster Kid travelling back in time to when the Great Monster War was at it's peak, finding out who sent them here, and trying to get back home. It stars McKenna Grace, Finn Wolfhard, Willem Dafoe, Lucy Boynton, and Christoph Waltz as their live action roles, while Aidan Gallagher, Bill Skarsgard, Keanu Reeves, Stephanie Beatriz, and Josh Brolin play their animated roles.

A third film was planned by producer Allan Heinberg and would be a more traditional fantasy film. DaCosta wanted to focus on more of the past of the underground and how that would tie into the lore of the film series. Filming began in October 18, 2031 in Ontario, Canada for most of the duration of the film. Post-productions including cinematography Don Burgess, edited was completed by Catrin Hedström and Craig Alpert, and music composed by Ramin Djawadi (who replaced Alexandre Desplat in the previous films due to Desplat's scheduling conflicts).

Plot
Dr. Alphys, who is seen staring at a computer, looks at the lab's elevator, strange noises coming from it. She texts Sans, who instantly comes by for a little talk.

Cast

 * Mckenna Grace as Frisk
 * Finn Wolfhard as Leon
 * Willem Dafoe as Daphness
 * Aidan Gallagher as Asriel
 * Bill Skarsgard as Flowey
 * Keanu Reeves as Sans
 * Stephanie Beatriz as Alphys
 * Lucy Boynton as Chara
 * Dev Patel as Calion
 * Josh Brolin as Jax
 * Christoph Waltz as Ghost

Pre-production
Undertale: Beyond the Void was first discussed by Undertale franchise producer Allan Heinberg after Undertale: Genocide opened at number 1 on the US box office in 2029, earning more than $100 million dollars on its opening weekend. Heinberg told Polygon that he would like to oversee a third installment, under the original title of Undertale: Secrets of the Underground. Shortly after, the film and another planned sequel were officially announced by Columbia Pictures on June 13, 2029.

At the same time, Nia DaCosta, fresh off the success of her 2023 film, The Marvels, had desires to make a fantasy film when she started her career. DaCosta said: "I really wanted to explore the realm of fantasy for some time. I loved films like Labyrinth and The Lord of the Rings, and I pursued to make one for years now." Producer Dylan Clark sent her the early script for Secrets of the Underground at a Hollywood gathering, and was interested at the idea. Three days later, DaCosta signed on to the project, along the reveal of the new title, Beyond the Void.

Writing
Writing duo Rick Jaffa and Amanda Sliver were brought in to write the first draft for the film. The duo's original script involved a portal in the underground that would send Frisk, Asriel, Leon, and Monster Kid back in time to the Great Monster War. Sans and Alphys would work together to find a way to get them back, while a new enemy hides in the shadows. When DaCosta signed on, the script was drastically changed to be more centered around the past of the underground and their inhabitants. Leon was removed for most of the main plot, acting more as a side character to Sans and Alphys.

Toby Fox and Temmie Chang had mixed reviews about the script. On one hand, it was interesting to see more of the underground's life and the humans, but they also felt the story didn't fit with the original game. Furthermore, the appearance of Gaster confused the duo, as they thought Gaster in the third film was "unnecessary". Fox and Chang's feedback sent the producers to rush an improved draft out, and a new writer, Derek Connolly, sent a new one in August 2030.

Casting
All of the other actors from the other two films, made a return in Undertale: Beyond the Void. However, the only person who didn't return was Pixie Davies, who was replaced by Lucy Boynton. Willem Dafoe was cast for the new character, Daphness, alongside with Dev Patel, Josh Brolin and Christoph Waltz.