David Troughton (born 9th June 1950) is one of the few actors to have appeared in both the 1963 and 2005 versions of Doctor Who, as well as several Big Finish audios. He is the son of Patrick Troughton. Like his father, Troughton is both a noted Shakesperian actor and a contributor to Doctor Who. He is, in fact, the first "child of a Doctor" to have a speaking role in the programme.
His largest role in the original version of Doctor Who was in the Third Doctor story The Curse of Peladon, where he played King Peladon. He also appeared in The War Games as Private Moor and The Enemy of the World as a guard. Decades later, he joined the BBC Wales team in Midnight as Professor Winfold Hobbes, an episode directed by Alice Troughton, to whom he is unrelated.
In licensed Big Finish audios, he has played the villain in several Fifth Doctor adventures. He was the Tinghus in Cuddlesome, and later a new incarnation of the Black Guardian in The Key 2 Time stories, The Destoyer of Delights and The Chaos Pool.
Beyond Doctor Who, Troughton is also a member of the Royal Shakespeare Company and a renowned classical actor. He also co-starred with Peter Davison in the TV series "A Very Peculiar Practice", and Colin Baker in three episodes of the audio-visual series, The Stranger. He enjoys strong friendships with both of these actors, and even shared living accommodations with Baker in the early 1970s.
He was also friends with actor Katy Manning at one point. According to Manning, both apparently wanted to convert the friendship into a romance, but neither had the courage to do so. (BBC DVD: The Three Doctors)