TV
One of McKern's earliest television roles was in the black and white classic The Adventures of Robin Hood. In the first episode he played Sir Roger DeLisle, who has usurped the Locksley manor and lands. (He also played Herbert of Doncaster, a corrupt moneylender, in the second episode.) In 1965, McKern took the role of Disson in Tea Party by Harold Pinter.
McKern was one of several Number Twos in the 1960s cult classic television series The Prisoner. McKern was one of only two actors to play Number Two more than once (the other was Colin Gordon). He first played the character in the episodes "The Chimes of Big Ben" and "Once Upon a Time" and later reprised the role for the final episode "Fall Out". Filming "Once Upon a Time" was a particularly intense experience for McKern. According to one biographer, the strain of filming this episode caused McKern to suffer either a nervous breakdown or a heart attack (accounts differ), forcing production to stop for a time.
Read more about this topic: Leo McKern