Borusa

Borusa is a fictional character in the television series Doctor Who. He is a Time Lord, and a former teacher of the Doctor. He was portrayed in The Deadly Assassin as a good person although pretentious with some political standing on Gallifrey, their home planet. In subsequent episodes he was portrayed with different actor each with somewhat different personalities.

His final appearance was in The Five Doctors after many years as Chancellor and then President and several regenerations, he eventually became greedy and attempted to seek immortality through seeking the power of Rassilon. He got it - he became frozen as a living statue.

His appearances were in The Deadly Assassin, The Invasion of Time, Arc of Infinity and The Five Doctors.