Overview
The Edge of Destruction (also referred to as Inside the Spaceship) is the third serial of the British science fiction television series Doctor Who. It was written by David Whitaker, and first broadcast on BBC TV in two weekly parts on 8 February and 15 February 1964. The first episode was directed by Richard Martin, while Frank Cox directed the second. In the story, the Doctor (William Hartnell), his granddaughter Susan (Carole Ann Ford), and her teachers Ian Chesterton (William Russell) and Barbara Wright (Jacqueline Hill) are in the Doctor's time and space machine the TARDIS when it appears to be taken over by an outside force. The travellers begin acting strangely and turn against each other.
The serial was commissioned as a "filler", in case the show was not renewed beyond the approved 13 weeks. Whitaker wrote the scripts in two days, based on an idea he had developed during the show's formative weeks; he sought to explore the characters in more depth, as well as the facets of the TARDIS. The serial's original director, Paddy Russell, left the project due to other commitments. The serial premiered with ten million viewers, maintaining the figures from the previous story, and received generally positive responses. The BBC Programme Board voiced concerns regarding a scene in which Susan uses scissors as a weapon, noting that it violated code. The serial received print adaptations, as well as home media releases.
Plot
The First Doctor (William Hartnell), while attempting to correct the TARDIS's faulty navigation circuits, causes a small explosion. The Doctor, Barbara Wright (Jacqueline Hill), Ian Chesterton (William Russell), and Susan Foreman (Carole Ann Ford) are all temporarily rendered unconscious. When they wake, Ian and Susan appear to have slight cases of amnesia and everyone begins to act strangely. The travellers are becoming suspicious of each other's motives, and the Doctor accuses Ian and Barbara of sabotage. Fearing that they have been taken over by some alien force—or that they have intentionally sabotaged the TARDIS to force the Doctor to return them to 1963—he drugs Barbara and Ian, unknowing that Ian is also suspicious and has not taken the drink given to him. The Doctor attempts to explore the problem without interference.
Gradually it becomes clear that the strange events are an attempt by the TARDIS itself to warn the crew that something is wrong.
From Wikipedia (CC BY-SA 4.0).