Berryshine is a simple mare from a simple town, and she has a simple wish.

A break.

Just one little holiday to recharge the old batteries, a nice, relaxing trip to someplace new, like maybe a reindeer town. Unfortunately, a 'minor' mishap up North means her train is commandeered for Shining Armour and Cadence's royal mission... with Berryshine still on it.

But hey, it's not like she needs to get caught up in anything, right? After all, the real heroes of Equestria are there to take care of business, and they never make mistakes.

Right?