There's a stranger in The City...a woman with a past...someone who could hold the key to everything possible. With AEGIS on the hunt for Miss Lint (who's gone rogue) and Superian missing, the City's in trouble... ...and one gallant superhero is going to have to come face to face with his past in order to save it.
Because it mattered. Time mattered; it was precious and fleeting. Only to the Doctor, time was everywhere and nowhere, everything and nothing.