Derek Buitenhuis (4 April 1931 – 27 March 2014), known professionally as Derek Martinus, was an English television and theatre director. Originally an actor, he directed episodes of Z-Cars and Doctor Who, for which he was best known. He also had a long career directing stage productions. For the BBC, he directed several Doctor Who serials, Galaxy 4 (1965), Mission to the Unknown (1965), The Tenth Planet (1966), The Evil... see more