"'The Schizoid Man' is an episode of The Prisoner. In an extremely complex plot of bluff and double bluff, Number 2 brings a lookalike of Number 6, referred to as 'Number 12', to The Village. Number 12 (also played by McGoohan, apart from a few shots with a double,) is not a clone, but an 'agent' of The Village who happens to bear a very strong resemblance to Number 6. ..."
Fifth broadcast episode of The Prisoner, where Number Six encounters his clone
The Schizoid Man (The Prisoner) - Wikipedia, the free encyclopedia