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.
Three nerds are summoned by a mysterious force to save Equestria by helping an Artificial Intelligence build a starfaring Changeling civilization in an attempt to save the world.
Queen Chrysalis and her son have been driven out of the Badlands, and gotten themselves captured by the guards stationed in Baltimare. Upon their transferral to Canterlot, Celestia arranges to get information from them by any means necessary.
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.
After an army of diamond dogs attack the Changeling Hive and kidnap the changeling princes and their allies, Pharynx finds himself to be the only one who can save the others ... well, Fluttershy's there, too, but how helpful could she be?