Ape on the loose, and it has taken Fluttershy hostage! What has caused this tamed circus ape to finally snap? Is there anypony who could stop him? Oh the Pon-manity!

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.

In an attempt to earn their cutie marks, the CMC do the craziest thing of the whole summer, try to drive a train. And crashing isn't the only problem on their hooves.

Applejack hasn't returned. Something must have gone wrong. Can Big Mac and Applebloom face the facts?