When Celestia comes to Ponyville for a visit on some royal business, she bumps into an excited and adorable little unicorn looking for a Princess to be at her tea party. Celestia, always working all the time, decides to relax and play along, letting
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.
Sweetie Belle had never really considered how so many ponies contributed to the mosaic of her life. At least until she thought she might not get another chance for one of them.
The Crusaders are discussing their next crusade when their fellow classmate, Rumble, asks them for some help regarding his older brother's behavior and they try to figure out why he's acting so strange.
After learning Diamond Tiara is a threat to the future, Apple Bloom sets out to save Equestria the only way she knows how...make Diamond Tiara love her.