Sweetie Belle magically derails a science experiment, causing her to switch bodies with Rainbow Dash. They try to masquerade as each other, but the weather team needs help and Diamond Tiara, well, is Diamond Tiara.
Spike woke up to find himself as his pony caretaker, Twilight Sparkle, while the original Spike somehow still acted like Spike himself. The now-pony decided to go about fixing it alone, with both expected and unexpected results.
Princess Celestia has been doing her job for a long time without a break. She finally decides it's time for a vacation. A mix-up with her replacement how
Sunset Shimmer casts a spell to switch bodies with Twilight. She embraces the royal lifestyle she's always wanted, but the reality falls short of the dream.
Celestia is having a horrible recurring nightmare. She knows that this dream is ridiculous and irrational. She knows she can trust Luna, there must be someway to rid herself of the dream. There just has to be a way!
Fluttershy is no longer herself and needs convincing from her friends to return to normal. However, the more they try, the more distant she becomes, and Twilight worries that they may lose their friend forever.