Celestia and Luna play a simple game of Truth or Dare with Cadence, Chrysalis, and Discord. When Luna is dared to threaten the destruction of the universe, things go haywire. And, of course, it was all Luna's fault.
Everypony thinks that Queen Chrysalis escaped capture, but Discord's captured her and holds her prisoner in his home dimension. She's going to get reformed by the Master of Mayhem. Eventually. Maybe. Theoretically.
Discord has feelings for Princess Cadence. Feelings that he has to get out, no matter what! And he's not going to let something like the fact Cadence is already taken stop him.
Former "Price is Right," host Bob Barker goes to Equestria to retrieve his microphone after Discord steals it, resulting in the two of them to get into a fight at the Grand Galloping Gala.
On one of their monthly picnics, the girls and Discord not only learn that Fluttershy is friends with Octavia Melody, but that she can also play one of the most elegant instruments: the violin.
Following the events of "Three's a Crowd," Cadence tells Shining Armor about her time with Twilight and Discord over a crystal mud bath with her husband.