Retrospective Review: The Return of Harmony · 6:40am Mar 21st, 2021
S2E1-2 The Return of Harmony pt. 1 and 2
Here's another episode that ended up being the first appearance of an important recurring character. It's interesting that, according to the Wiki, this episode was planned in Season 1. And in an alternate universe where the series ended after 65 episodes, Discord would just have been some villain that the heroes defeated and later reformed.