Discord travels to an alternate timeline so he can have fun without angering his new friends, and ends up in a horrible situation.
Twilight Sparkle, element of Magic and Order, reports to Princess Celestia on her findings regarding the apparent re-emergence of Discord.
Spike is trying not to muster up any sympathy for Discord.
The Mane 6, plus Spike, go to a universe where their doppelgangers have been turned evil, to rescue Discord.