Warning: Spoilers ahead for Doctor Who season 15, episode 2, "Lux."The God of Death's exit in Doctor Who season 14's finale could be interpreted as a temporary setback given the character's history, but season 15, episode 2, "Lux," teases the fact that Sutekh (Gabriel Woolf) is gone for good. The One Who Waits' true identity being revealed as Sutekh was one of season 14's biggest twists, as the villain hadn't appeared in the show since the 1975 "Pyramids of Mars" serial starring Tom Baker's Fourth Doctor. Alan Cumming's Mr. Ring-a-Ding/Lux Imperator, the God of Light, mentions Sutekh in "Lux," and it doesn't sound good for Woolf's character.