The Doctor, the Last of the Time Lords, crash lands in an unfamiliar version of Equestria and teams up with Phillip Finder, a local detective with the reasoning abilities of Shelock Holmes, to unravel a series of sinister kidnappings...
For years, Sunset Shimmer has held her place at Celestia's side. She was her prized student, her number one prodigy. In return, Celestia was Sunset's world, her passion. However, with time and age come change, and Sunset cannot take it any more.
Mister Lonely Heart is a changeling "Grievance Councelor", who imitates ponies that his clients have problems with. Applejack wants to say a few choice words to a relative. A dead relative.
Young Princess Cadance has gained the ability to see ponies' emotions, but sometimes what she sees puzzles and confuses her. Surely Princess Celestia can't actually be depressed?
Mister Lonely Heart is a self-styled "Grievance Counselor", a changeling who mimics ponies that his clients have issues with. When Twilight Sparkle pays him a visit, he finds out how painfully neurotic the Princess of Friendship really is.
In the aftermath of her battle with Starlight Glimmer, Twilight Sparkle and Spike are trapped in an alternate present. To find a way back home, they press on into the unknown to discover the mysteries of the barren wastelands of Equestria.
Spike is leaving Ponyville for good. Before he leaves, there is one last bit of business to take care of with a very dear pony. "I love you." "I know." "Goodbye."