He played Duggan in the Doctor Who serial City of Death (1979) and returned to Doctor Who as Merdeen in the 1986 serial The Trial of a Time Lord. Chadbon has also been an occasional guest star in Big Finish audio productions. Most notably, he played the recurring character of Will in the second series of the Sarah Jane Smith audio adventures. He also had a featured guest role in No More Lies, during Paul McGann's 2007 broadcast season on BBC Radio 7. He also reprised the role of Del Grant for the Blake's 7 audio series for Big Finish.
