"Do Not Forsake Me Oh My Darling" is an episode of the allegorical British science fiction TV series, The Prisoner.

It was the thirteenth episode to be broadcast in the UK on ITV (ATV Midlands and Grampian) on Friday 22 December 1967 and first aired in the United States on CBS on Saturday 3 August 1968.

They are analysing photographic slides by way of seeking clues that will lead them to locate a missing inventor named Professor Seltzman (later revealed to have developed a technology that can switch two people's minds into one another's bodies).

After the swap, Number Six (now in the Colonel's body, and retaining only his pre-Village memories) awakens in his old London apartment and soon sees an unfamiliar face in his mirror.

After a visit to his former superiors (the most senior of them, Sir Charles Portland, previously seen in the teaser) avails him nothing, he attends his fiancée's birthday party.

With the retrieved slides back at his flat – they had previously been taken by Sir Charles's minions, and then returned to the shop – he uses an alphanumeric code system based on Seltzman's name to select certain slides which, projected together and viewed with a special filter, reveal the location of Seltzman.

But in this earlier draft of the story, Number Six awakens in his flat in a furious mood, storming to his office to angrily resign.

Fearing that this is a ploy to force him to reveal confidential information, Six leaves the office, determined to find "Saltzman" (who became Seltzman in the broadcast version), the inventor of the body-swap machine.

Meanwhile, Number Six's former employer, the Colonel, is shown to be in collusion with a mysterious, unseen figure, an apparent agent of the Village.

He later meets her at her birthday party and reclaims from her a receipt for developed photographs held at a camera shop, which Six gave to Janet a year ago.

Six procures the photographs from the shop, which, overlaid atop each other, produce a map with a set of co-ordinates in Kanderfield, Austria.

Saltzman is forced to show his captors how to reverse the mind-transfer process, in order to return Number Six and Oscar to their proper bodies.

While the televised version ignores the issue of Number Six's resignation, the original script has Six angrily carrying it out.

One scene has Number Two conversing with Oscar-in-Six's-body, who is represented through what the script describes as a single shot of McGoohan.