Migoi

 are a very frail race of abnormals that defend themselves by manipulating other beings' mind and having those beings kill each other and themselves.

Dr. Helen Magnus and Dr. Will Zimmerman traveled to the Hindu Kush in search of a Yeti. They believed they had succeeded in capturing one and loaded it onto a plane bound for the New Delhi Sanctuary. However, the creature they captured wasn't a Yeti, but in reality a migoi which had used its' psychic abilities to make them believe it was a Yeti. The migoi escaped by tricking Will into not locking its' cage and then killed the plane's pilot thereby causing a plane crash. The migoi soon claimed the plane as its' territory and began killing off the passengers. Magnus was finally able to kill the migoi when it disguised itself as Will and she asked it for coffee with it saying yes Magnus knew that it wasn't Will as the real Will knows she hates coffee.

About three years later, a group of migoi were discovered frozen on a Russian icebreaker full of dead crew and abnormals. the two free ones that killed the crew pretended to be Magnus and Will in order to manipulate the Sanctuary team, consisting of Henry Foss, Declan MacRae, Alistair, and two others in order to save the rest of them. They tricked them into believing that salt water supercharges migoi, in order to get the team to move the frozen ones to higher ground in order to be saved from the rising salt water.

However, this plan fell apart when the real Magnus and Will arrived, and Magnus disproved her double's statement about the salt water by throwing herself and the migoi into the water killing the creature. Will then shot and killed his double. The team took the rest of them to the Sanctuary, noting that they had not done anything wrong and did not have the blood of the Russian crew, or the three Sanctuary members on their hands.