Rockhoof has returned to Equestria after a thousand years in Limbo. He's also severely depressed. Princess Luna pays him a visit in his lonely dream to find out what troubles him.
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.
Derpy loves flying through the sky. It’s what she lives for. There is nothing in the world that she would rather do more. The sky is her domain and there is nothing that will keep her from it.
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.
I don't know how I wound up here, but suddenly everypony is relying on me for their survival after a terrible curse has fallen over the land. This is not the Equestria I remember.