An episode of The Prisoner. This episode stars the same Number Two (Colin Gordon) as A, B & C, and there is some debate as to which is supposed to come first -- see episode orderings for `The Prisoner'.

In this episode, a satire on the education system, The Village is dominated by an experimental new Speedlearn project masterminded by The Professor and controlled by an unseen General -- a method of subliminal teaching that could quite easily be perverted towards more unsavoury ends in the wrong hands. Number Six finally discovers the true nature of The General and defeats The Village's plans.