Commander (The Five Doctors)

During the crisis in the Death Zone on Gallifrey, the Commander of the Chancellory Guard carried out a search of the quarters of the Castellan on the orders of Lord President Borusa and discovered the Black Scrolls of Rassilon. Authorised to use the mind probe, he removed the Castellan for questioning but almost immediately shot him dead in an apparent escape attempt. (TV: The Five Doctors)