After visiting the spa, Fluttershy and Rarity drop in to say hi to Twilight. Unfortunately, they end up startling her in the midst of her studies, and a spell is accidentally cast. The end result? Fluttershy and Rarity switch bodies, and Twilight has no idea how to fix it - yet.

For the two friends, learning how to handle their new bodies will be challenging enough. But what about the lives and responsibilities attached to them? Things only become more complicated when the Cutie Mark Crusaders get involved...