Derek Newark (8 June 1933—11 August 1998) was an English actor.He appeared in a large number of film and television roles, including The Baron (1967), The Avengers (three episodes in the 1960s), Z-Cars (six episodes between 1969 to 1972), Barlow in the regular role of Det. Insp. Tucker (1974–1975) and various other minor roles. He appeared in episodes two to four of the first Doctor Who story An Unearthly Child in 1963. Later he appeared opposite Jon Pertwee in the 1970 story Inferno.