We watch “The Girl Who Died” (Series 9, Episode 5) where the Whonamic Duo of the Doctor and Clara encounter a Viking ancestor of Steve's named Ashildr. Whilst said family reunion is occurring, Norse god Odin shows up proving Disney is no marvel of history, Ashildr dies after ensuring her peoples will live on, and the Doctor rewards Ashildr’s sacrifice with kindly granting her the curse of immortality. Will Ashildr be bitter? She assuredly will. Did I not mention this was a two parter? I assuredly meant to. My bad.