Vatuus

 was part of the Moonflesh. It appeared after Hannah Bartholemew started to examine the Moonflesh. It inhabited a Gorilla. It's kind later invaded Nathaniel Whitlock's estate, to assassinate it. It later claimed sanctuary, when it inhabited Phoebe Whitlock. Later it inhabited Nyssa, and tried to take control of the TARDIS. (AUDIO: Moonflesh)