Mentiad

The Mentiads were a group of individuals that gained psychic abilities following the destructions of the populations of the planets that Zanak destroyed in persuit of rare minerals for Xanxia's time dams.

After the Doctor, Romana and K-9 interceded and assisteded them the Mentiads destroyed the Captain's bridge and Xanxia's time dams. (DW: The Pirate Planet)