The Ancient One (The Curse of Fenric)
Ingiger was one of last of the original Haemovores. It lived on a polluted Earth, after all of its children had died from the pollution. She was then brought to 10th century Transylvania by Fenric. Fenric commanded her to follow the vikings who had stolen the flask containing Fenric. She fed on them, turning many of them into Haemovores. She and the Haeamovores followed the vikings and after they were killed by the pirate Hemming, following him to Maiden's Bay. Though Hemming and all his men were killed by the Ingiger, Hemming had buried the flask beneath St. Jude's Church where they could not get it.
Eventually, in 1943, Ingiger was awaken again by Fenric. She was used to control the Haemovores, which were used to attack the soliders in the base. Using the poisons made by the nearby base, Fenric intended to pollute the world, causing the future that created the Haemovores. The Doctor was able to convince Ingiger to betray Fenric, convincing her that Fenric would not return her to her own time. (DW: The Curse of Fenric)
