- Not to be confused with Once Upon A Time - Undertale (GiIvaSunner) (the original rip this one is based on)
- Also not to be confused with Once Upon a Time - Undertale (an later version of this rip featuring Meet The Flintstones; note the lowercase "a")
"Once Upon A Time - Undertale" is a high quality rip of "Once Upon A Time" from the game Undertale.
At 0:14 the melody is replaced with the melody of "Star Wars (Main Title)" by John Williams, the main musical theme of the Star Wars franchise. At 0:28 the melody switches back to the original and it turns into a mashup of "Once Upon a Time" and "Star Wars (Main Title)". At 0:58 the mashup ends, with only the original melody remaining. At 1:20 the melody is mashed up with the melody of "The Nutshack".
This rip is a variation of an older GiIvaSunner rip, Once Upon A Time - Undertale (GiIvaSunner), which was uploaded on January 13, 2016 and hasn't been yet reuploaded since the termination of that channel. That rip was pretty much the same, except it didn't have The Nutshack at the end.
This rip was uploaded on July 21, 2016. Since it had exactly the same title as the original GiIvaSunner rip, it confused and upset some viewers who considered it "ruined" by The Nutshack. Most likely, it was in fact a trolling attempt by SiIvaGunner, similar to Battle! (Wild Pokémon) - Pokémon Ruby & Sapphire (May 30, 2016).
This rip was later unlisted for an unknown reason at an unknown date.