We talk about Supernatural Season 1, Episode 6 "Skin" an episode which didn't skeeve Diana out and Liz can't stalk talking about proper sewer attire. The lore this week is about doppelgängers and Emilie Sagée.

Sources:

http://folklorethursday.com/folktales/doppelganger-double-meaning-folklore/

https://mythology.net/others/concepts/doppelganger/

http://www.paranormal-encyclopedia.com/d/doppelganger/

https://listverse.com/2013/08/30/10-disturbing-tales-of-doppelgangers/

https://coolinterestingstuff.com/the-very-strange-case-of-emilie-sagee

https://mysteriesrunsolved.com/2020/04/emilie-sagee-doppelganger.html

https://youtu.be/YNlnoPfrg1M

https://youtu.be/pdoIr0LG9Ws

http://themutineer.org/the-double-life-of-emilie-sagee/