Sentreal

Sentreal was a representative of his home galaxy when he allied himself with the Daleks in their plan to conquer the Solar System. After he was betrayed by the Daleks, the Doctor convinced him to go back to his own people and warn them about the Daleks' invasion plans.

Sentreal had an all-black body that appeared to consist of several cones stacked on top of each other, a cylindrical head, and two glowing eyes.