"Checkmate" is the first of the great episodes to appear here. This definitive, quintessential Prisoner, with deception, plots, distrust, action and tension. I can't reveal specifics without spoiling it, but the writing is superb and I gaped in amazement after watching this.
Next is perhaps my favourite of all the Prisoners. "Hammer Into Anvil" sees Number Six swear to make Number Two pay for causing an innocent death in a most cruel fashion. It's unexpectedly thrilling to watch Number Six go to war, and a welcome message to both the viewer and "them" that even as a prisoner, Number Six is not helpless, given motive enough. Ingeniously written and featuring arguably the finest acting of the series, this episode is unmissable.
"It's Your Funeral" is slightly confusing. Number Two proves better than expected, and interesting events unfold as the customary manipulations take place on both sides, but it never became entirely clear - to me, at least - exactly why Number Two and his masters wanted Number Six to know their plan in the first place. Still, entertaining stuff.
With some slightly odd plot devices and the odd unconvincing moment, "A Change of Mind" is a little patchy. However, the delight of this episode, as is the case with so many others, comes from watching Number Six fight to overcome the adversity forced upon him by Number Two's latest plot. Also an unprecedented satisfying ending.
The juxtaposition of Prisoner and Guardian is fantastic even the Controller and the Butler begin to question Number 2's sanity. This is the only episode of the series where Number 6 actually has some kind of victory. He breaks Number 2 resolve but is still captive in the village.
An outstanding episode.