- Not to be confused with Once Upon A Time - Undertale (GiIvaSunner) (the original rip this one is based on; note the capital "A")
- Also not to be confused with Once Upon A Time - Undertale (an unlisted previous version of this rip featuring The Nutshack; note the capital "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 1:13 the melody is replaced with the melody of "Meet the Flintstones".
This rip is a variation of an older GiIvaSunner rip, Once Upon A Time - Undertale (GiIvaSunner) (note the capital "A"), 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 Meet the Flintstones at the end.
On July 21, 2016 SiIvaGunner uploaded Once Upon A Time - Undertale (note the capital "A"). It was the first variation of Once Upon A Time - Undertale (GiIvaSunner), adding The Nutshack at the end of the rip. That rip was later unlisted for an unknown reason at an unknown date.
Finally, this rip was uploaded on September 16, 2016. Interestingly enough, this rip's title always featured a lowercase "a" ever since its upload, while both the GiIvaSunner version and the unlisted version had capital "A"'s.
- For some reason, this rip's background image features a bigger Undertale logo than the GiIvaSunner rip and the unlisted rip.