Underground was a science fiction television play presented as part of the British anthology series Armchair Theatre which was broadcast live by the ITV commercial network on 30 November 1958. It is chiefly remembered because an actor had a fatal heart attack during transmission. Written by dramatist James Forsyth (1913–2005) the play depicted survivors from a nuclear holocaust living in the London Underground. It featured actors Donald Houston, Ian Curry, Patricia Jessel, Warren Mitchell, Peter Bowles and 33-year-old Gareth Jones in what would be his last role.