After Tirek was put back into Tartarus, much of Ponyville still had to be rebuilt, including Twilight Sparkle's old home, the Golden Oak Library. However, the Mane Six needed a vacation, and The Doctor was the only one qualified to do it! So he took his assistant, Derpy Hooves, as well as the Mane Six(Twilight, Applejack, Rainbow Dash, Fluttershy, Pinkie Pie, and Rarity) on the vacation of a lifetime!!!