Season 9, Episode 12, "The Last Crusade"

https://ratofdrawn.tumblr.com/post/83738698811/the-three-17-x-11-prints-i-had-at-babscon-also#_=_

Synopsis: Unexpected visitors to Ponyville threaten to break up the Cutie Mark Crusaders forever.

Now this sounds quite dramatic.

Have fun with the episode everyone!