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"Once Upon a Time (Trailer Version) - Undertale" is a high quality rip of the trailer version of "Once Upon a Time" from Undertale.


At the beginning, the melody changes to "Star Wars (Main Title)" by John Williams, the main musical theme of the Star Wars franchise, a callback to "Once Upon a Time - Undertale". At 0:07, it changes to "Mother Earth" from EarthBound Beginnings/MOTHER, a callback to "Once Upon a Time (OST Version) - Undertale". At 0:11, it changes to "Meet the Flintstones", another joke from "Once Upon a Time - Undertale".