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The pilot of Underverse was originally a short video featuring only images of Classic!Sans, Underfell!Sans, Underswap!Sans, Outertale!Sans, Ink!Sans, Geno!Sans, and Error!Sans, ending with the formation of a wallpaper. The release date of the pilot is marked as Underverse's anniversary, and the pilot influenced Jael Peñaloza to create the comic of Underverse, eventually transforming into an animated series with the release of Underverse 0.1 Part 4.

The animation is set to the music "Headphone Actor" by IA.