The CMC stumble upon a parallel universe; where a pleasent dream is reflected by reality, and reality is actually evil. It's up to Applejack to venture in and rescue the fillies, before they are consumed by an ominous being.
Welcome! CAUSE, I NEVER LOOKED BEHIND, I NEVER TRIED TO FIND! SOMETHING THAT COULD HAVE MADE ME ONE!!! SOMETHING THAT I COULD REACH THE SUUUUUUUUUUUUUUUUUUUUUUUUUUUN!!!!