Thread:Katlovr/@comment-28482541-20180112004105/@comment-28482541-20180115143106

Here is the most comprehensive article I have found yet. Also, at the end of it there is a wonderful list of all the episodes of SPN since season 5 that lead up to and builds the foundation for Wayward Sisters.

https://nerdist.com/wayward-sisters-supernatural-spin-off-what-you-need-to-know/