"Once Upon a Time" is the penultimate episode of the allegorical British science fiction TV series, The Prisoner. It was written and directed by Patrick McGoohan and sixth to be produced. It was first broadcast in the UK on ITV on Thursday 25 January 1968 and first aired in the United States on CBS on Saturday 14 September 1968. The episode starred Patrick McGoohan as Number Six and re-introduced Leo McKern as Number Two. McKern's Number Two had previously appeared in "The Chimes of Big Ben" and would also appear in the last episode "Fall Out". The main theme of the episode is the use of regressive therapy to break Number Six's will.
Plot summary
The Number Two from the earlier episode "The Chimes of Big Ben" returns to the Village. He calls his superiors and obtains permission to undertake a dangerous technique called "Degree Absolute" in a final attempt to break Number Six and learn why he resigned from his position as an intelligence agent. Number Six is put into a trance state, causing his mind to regress back to his childhood. He is taken to the "Embryo Room", deep below the Green Dome, filled with various props, as well as a caged room that contains living space and a kitchen. He, Number Two, and the Butler are subsequently locked into the room via a timer that will unlock the room after one week. Number Two begins to use regressive therapy following Shakespeare's Seven Ages of Man, using the various props to enact a series of psychodramas, with Number Two playing the authority figure and Number Six the subject. Each drama is aimed at trying to make Number Six explain why he resigned. During the first six of these, Number Two finds Number Six has developed an aversion to saying the word "six". Number Two also comes to like and respect Number Six as he learns more about him. On the final day, Number Two enacts the role of military jailer, harshly interrogating Number Six as a prisoner of war. Number Two's efforts seem to have effect as Number Two starts to blather on reasons for resigning, but he becomes concerned when Number Six says he knew too much, including about Number Two. Number Two becomes agitated, and Number Six continues to call him a fool and an idiot. Suddenly, Number Six starts counting down from "six", and by the time he has reached zero, has regained full control of his mind. Already exhausted from his efforts, Number Two is shocked. Now in control, Number Six explains that Degree Absolute, a well-known psychiatric technique, has its risks to the one performing the therapy if they have their own psychological problems. Number Six shows this understanding in a brief role reversal, much to Number Two's delighted amusement. Number Two recovers and joyfully offers Number Six a tour of the Embryo Room. They end at the door timer, finding only five minutes remain before the room unlocks. Number Two becomes scared and pleads with Number Six to tell him why he resigned. Number Six remains quiet as Number Two goes to the kitchen area and pours them both a glass of wine. Number Six suddenly closes the door to the caged area, locking a panicked Number Two inside. The Butler takes the key from Number Two. Number Two paces the caged area while a voice screams "Die, Six, die!", until the timer runs out. Number Two falls over, apparently dead. The door to the Embryo room opens where the Supervisor waits. He tells Number Six they will need the body and then asks Number Six what he wants. Number Six only replies "Number One", and the Supervisor offers to take him there. He, Number Six, and the Butler depart the room.
