My Little Pony: Friendship Is Magic
What Lies Beneath
S8 E22:
The students at Twilight's School of Friendship are cramming for a "History of Magic in Equestria" exam in the school library when they discover a part of the school that no pony else knows about. When they decide to do some exploring they end up learning much more than they bargained for.
Director
Jayson Thiessen, Jim Miller