Gallus wants to ask Silverstream to the Amity Ball their sophomore year without embarrassing them both to death. Silverstream wants that, too. The Spirit of the Tree of Harmony, learning of this, wants to help.
After a terrifying accident in the Crystal Empire leads to the discovery of a thousand year old zombie bioweapon, the creatures of Equestria and beyond must struggle to keep the magic of friendship alive as they fight against the hordes of undead.
The war is won, and the villain is defeated, but you never escape from your scars, not even when you retreat into your dreams. But now you must put an end to the one who started it all, no matter the cost.
Before Twilight and her friends left on another adventure, she assigned a substitute teacher to cover her class on history. The students expected a pushover substitute but that's not who walked through the classroom door.
In the wake of opening the School of Friendship and Twilight seeking for more teachers, Fluttershy asks Discord if he would be interested. He said that he will do a test drive by teaching his students a lesson in Philosophy.
After the events of "Discord Teaches Philosophy," the Spirt of Chaos takes up the role of a Substitute. However, after spying on the main teacher, he decides to step in.