Vastra

Vastra was a female Silurian warrior who was friends with a human woman who was implied to be her partner, in Victorian London. She seemed to enjoy eating humans. She was one of many people who owed the Doctor a debt. She was summoned by him to help in the mission to rescue Amy and her baby at Demon's Run. She and Jenny arrived at Demon's Run along with a squad of Silurian soldiers, they both survived the battle with the Headless Monks. (DW: A Good Man Goes to War)