“The Satanist’s Apprentice” feels very much like an episode of TV written by a bunch of people who just lived through 2020 and needed to work some things out. While not a ‘Covid episode’ in a conventional sense, the threads tying Astra and Sara’s adventures to this particular era don’t stop at the creative means by which director Caity Lotz and writers Keto Shimizu and Ray Utarnachitt limit the number of actors physically present for any given scene. This is an episode shaped by, ah, topical questions. What happens when we feel, or actually are, helpless? What’s the cost of isolation? When we feel a lack of agency, how do we compensate? And of course, the big question: Which season of Wynonna Earp is the best?