Ahead of Doctor Who's grand finale next week, “The Legend of Ruby Sunday” contends with not just one but two overarching season-long mysteries that may or may not be connected. And no, I'm not referring to why The Doctor flew his TARDIS dramatically into UNIT HQ when he could have just materialized inside, as per usual. That was just the Doctor's flair, and the flair of Russell T. Davies as well who's always leaned into bigger, is better in these epic two-part season finales.
Beyond that, the two biggest mysteries in question revolve around two mystery figures, a woman the Doctor keeps seeing and a woman he's never seen; namely Susan Twist's recurring character - whose face has popped up everywhere from 60s London to Planet Sloog - as well as the identity of Ruby's mother who left her as a baby on Christmas Eve, 2004.
