Anemone changeling (An Ordinary Life)

Anemone changelings were a species on Earth which could imitate other lifeforms and were telepathic in nature. They lacked a proper sense of self-conscience, and possessed a limited intelligence. They were able to create physical duplicates of other living beings and, to a certain extent, copy their thoughts and memories. However, they were unable to recreate particular physical structures, as those of handicapped people and species only seemingly human, as Time Lords.

They existed under the ocean for millennia, until Michael Newman, a Jamaican immigrant to England, who had great psychic abilities, fished out their knot-heart, the central brain connecting them all, and brought it to London in the 1950s. His powers awoke them, and they instinctively possessed his mind and created a duplicate of him; they then continued to use him as a source of energy as they started copying other people he knew, with the purpose to live all on mainland. They sensed the great power of the TARDIS, and forced it to land in London, where Michael had been heading to live with his wife and her uncle. (AUDIO: An Ordinary Life)