The title of the episode, "The Satanist's Apprentice", is a pun on The Sorcerer's Apprentice, a poem by Johann Wolfgang von Goethe. Klemmer said the focus of the episode would be Astra Logue, portrayed by Olivia Swann, and that she would serve as the episode's version of a Disney Princess. The episode follows two parallel storylines, Astra's storyline at John Constantine's manor, and Sara Lance / White Canary's storyline in Bishop's lair, which Lotz felt "didn't go together" tonally, since they "were kind of their own thing, and both of those storylines were pretty full and dynamic and had their very own loud personality". She considered it a challenge to ensure they fitted together so that "it still felt like you were watching the same show, which is hard when you have space aliens and then Disney princess animation and normal life". The episode references the TV series Wynonna Earp, which Lotz said was a nod to an episode from that series in which a character mentions Sara.
