"The Chimes of Big Ben" is an episode of the 1967-68 British science fiction-allegorical series, The Prisoner. It originally aired in the UK on ITV on 6 October 1967 and was first broadcast in the United States on CBS on 8 June 1968. The episode starred Patrick McGoohan in the character of Number 6 and introduced perhaps the most popular of the many characters who would bear the title of "Number 2" in the series, that of Leo McKern. McKern's Number 2 would return for the last two episodes of the series.