Twilight's "Baby" Dragon

One morning, Spike wakes up to find himself in a strange and unfamiliar place. To his surprise he discovers that he's an actual baby dragon with an emphasis on the "baby" aspect. And Twilight is his caretaker.

Curious as to why no one remembers him never being this before, Spike tries to figure out how he ended in what he concludes to be a parallel universe. And more importantly, how he'll find a way back to his own universe