The first two batches of The Prisoner toys were 3 3/4" and were from two Kickstarter campaigns - the ones on BBTS are all from the second Kickstarter I believe. They just introduced the 6" figures recently - not sure how they did as folks like me were already were a dozen characters deep with the 3 3/4" waves.
The Prisoner is one of the greatest TV shows ever, absolutely groundbreaking and unique from 1967 - 17 episodes total. The main gist - a presumed secret agent resigns from his agency and is kidnapped and placed in The Village and branded #6, where a procession of people in the role of #2 attempt to determine his loyalty and allegiance, while he fights against their efforts - and the question remains if he is a prisoner of his own government or another. Very science fiction and surreal at times. Patrick McGoohan, who played a spy for years on British TV (Danger Man), created the series and wrote and directed parts of it - it is purposely unclear if this a sequel to that show.