Queen: Oh, that was a good move, wasn't it.
Number Six: I know a better one.
Number Six: Away from this place.
Queen: That's impossible.
Number Six: For chessmen, not for me.
Number Six: Don't tell me you care?
Number Two: Well, of course. We want you to be happy.
Number Six: Fine. Just, umm... give me a one-way ticket home.
Number Two: Won't you ever give up?
Number Six: What do you think?
First Psychiatrist: Is he in for treatment?
Number Two: Not yet.
First Psychiatrist: Pity... interesting subject. I should like to know his breaking point.
Number Six: Well, you could make that your life's ambition.
Number Two: Isn't it rather late to come visiting?
Number Six: We didn't like to leave without thanking you for having us.
Chessmaster: It's like the game. You have to learn to distinguish between the blacks and the whites.
First Psychiatrist (about Number Six) "Total disregard for personal safety and a negative reaction to pain."
Number Two: Well he wouldn't be able to fake that.
First Psychiatrist I never met a man who could. It would require superhuman willpower.
Number Two: They'll be back tomorrow - on the chess board. As pawns.
Number Six: (referring to the chess game) Why do you use people?
Man With Stick: Some psychiatrists say it satisfies the desire for power. The only opportunity one gets here.
Number Six: That depends what side you're on.
Man With Stick: (quickly) I'm on my side.
Number Six: (quickly) Aren't we all?
Man With Stick: You must be new here. In time, most of us join the enemy... against ourselves.
(The Queen has been brainwashed into thinking that she is in love with Number Six. She tells him so but he does not believe her. She starts to cry)
The Queen: How can you doubt me?
Number Six: It's easy and I'm waterproof; a little drizzle won't wash away my doubt. So don't try.
The Queen: I only want to be near you.
Number Six: Everybody's near in this place. Far too near.
The Queen: Do you think they'll ever release us?
Number Six: Let me know. I shan't be around.
Although Don Chaffey is credited for directing the entire episode, he actually only directed the scenes shot on location. All of the interior scenes were directed by Patrick McGoohan (Number Six).
The working title of this episode was "The Queen's Pawn".
Along with Leo McKern, Colin Gordon and Mary Morris, Peter Wyngarde is one of only four Number Twos to have their voices added to the interrogation scene in the opening credits. The "standard" voice of Number Two was provided by Robert Rietty.
Australian actor Terence Donovan, who plays the sailor in this episode, is the father of Jason Donovan, well known actor and singer.