Twilight has dealt with a variety of foes since coming to Ponyville. But she finds herself pulling out all the stops to deal with the most dastardly (and curious) fiend yet encountered: Sugarcube Corner’s haunted mailbox.
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.
The Cutie Mark Inspector visits Ponyville to conduct a cutie mark review of the townsfolk. When it transpires that every pony has been interpreting their cutie marks wrong, Ponyville is thrown into chaos.
When Pinkie Pie's Pinkie Sense stops working, she goes to Twilight to figure out what's wrong. Twilight's tests make her violently ill, and reveal a shocking truth...
Jokes are taken too far all the time, and can occasionally end in feelings being hurt. But what hapens when a joke is taken too far, and only one pony knows it's a joke?