“God of light” sounds like such a positive character, and yet the opponent the Doctor faces in “Lux” is anything but bright and sunny, at least as far as his personality is concerned. I will get back to the first episode of this season, “The Robot Revolution,” very soon. But having fallen behind on writing, it seems appropriate to jump in on this second episode, titled “Lux,” since it intersects with religion very directly. We had seen the Doctor confronting... Read more