That's an error, because episodes can be cited directly, and the template "cite episode" exists for this:

https://en.wikipedia.org/wiki/Template:Cite_episode

It can be seen in use for instance on the Beavis and Butt-head article, https://en.wikipedia.org/wiki/Beavis_and_Butt-Head where the citation looks like this:

"Werewolves of Highland". Beavis and Butt-Head. Season 8. Episode 1. October 27, 2011. MTV.