Stenza

The Stenza were a warrior race and self-proclaimed conquerors of the Nine Systems. They had cold skin and could kill by placing their hands to the face. They would then take a tooth from their victims as a trophy, and graft it onto their faces.

One Stenza called Tzim-Sha travelled to Earth in order to capture a human called Karl Wright so he could become the leader of the Stenza. (TV: The Woman Who Fell to Earth)