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In page Enlightenment (Doctor Who):

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The first draft of Part One did not contain any of the material concerning the Guardians, and Turlough was a peripheral figure, with the script focussing on the relationship between Marriner and Tegan.[3] With pre-production underway, Saward changed the story title to Enlightenment in September 1982, a title he felt was more enigmatic.[citation needed] Saward also rewrote portions of the script pertaining to the story-arc, particularly the final confrontation scenes at the end of Part Four.[4] Peter Moffatt had been originally scheduled as the serial's director, but following the problems with the Space Whale script he was asked to helm its replacement due to his experience, and so Fiona Cumming was asked to take over Enlightenment.[5]