I was hard on myself during my time as Princess Twilight's student. Nothing but my studies had mattered ever since she saved me from my own magic. When I finally burned out, Equestria was on fire.
After many incidences like The Great and Powerful Trixie, there has to be somebody to help clean up this mess. Especially when fire strikes, the five brave ponies of the Ponyville Fire Department are there.
When the Mane 6 get swapped out with Mario on his quest to save Princess Peach, and chaos erupts everywhere. Equestria must now be saved by the hero of the Mushroom Kingdom, and vice versa.
What Rainbow Dash thinks will be a quick trip to Cloudsdale ends up something much more. After bumping into each other and practically tearing down the city in the process, Rainbow Dash and Lightning Dust soon find themselves flying away fugitives...