Gearon

Gearon was a representative of his home galaxy on the Galactic Council who had 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. (DW: The Daleks' Master Plan)

Gearon had a featureless, egg-shaped head and wore a visor. (DW: Mission to the Unknown, The Daleks' Master Plan)