MLP/Undertale/Undertale RED

"So you guys are ponies, this is your kingdom, and we somehow got here by falling down a hole at the garbage dump???" Red asked.

"Yes," Celestia replied.

"So how do we get back?" Asriel asked Celestia.

"We will see if my student, Twilight Sparkle, can use magic to get you back home."

"Thank you Princess Celestia. We should really be trying to find this "Twilight Sparkle"." Red said politely.

"Goodbye children," Princess Celestia waved.

Just as they were about to leave, Cadence walked through the door.

"Princess Celestia, I saw your letter asking for me to come to Canterlot." Princess Cadence said, before noticing the others.

"Celestia, Who are these creatures?" Cadence asked.

"The taller ones are "Monsters" and the small one is a "human" Celestia replied.

"But what are they doing here?" Cadence asked

"They fell down a hole back in their world, and they ended up here." Celestia replied. "Alright children, it is time for you to meet my student, Twilight Sparkle."

Celestia wrote a quick letter asking Twilight to come to Canterlot at once, as there were some people who needed her help. It arrived in Ponyville fairly quickly, as it traveled through Spike the dragon. Quick as a flash, Twilight teleported right inside of Canterlot Castle, in the same room where everyone was standing.

"I'm here Princess Celestia, are these creatures.......You look exactly like what I saw when I went through that portal." Twilight said, dumbfounded.

"Yes, they have come from a similar world, where the goat, didn't you say your name was Asriel? And the one in the cape, Red right? Where their kind is trapped underground, by the humans, which is what the tiny one is." Celestia explained.

"Let me guess, they need to get back to their world?" Twilight asked.

"Exactly," Celestia replied.