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.