Doctor Who Ally Profile: Madame Vastra
We meet Vastra in “A Good Man Goes to War”, when the Doctor calls in his favors to save Amy from the Silence, Madame Kovarian, and the Headless Monks at Demon’s Run. She owes the Doctor for stopping her from going on a rampage through London (and presumably, being killed) after being awoken by construction on the London Underground. Eventually, she managed to build a life in Victorian England, marrying her maid Jenny, becoming a detective, and assisting Scotland Yard with their particularly difficult cases (such as Jack the Ripper).