The Doctor (Doctor Who) and therefore cannot be spoken. The character played by Peter Cushing in the films "Dr. Who and the Daleks" and "" referred to himself as "Dr. Who". However, these films are not considered part of the same narrative continuity as the television programme, as they were based upon two television serials featuring William Hartnell and made considerable alterations to the characters of the Doctor and his companions. Quite apart from his name, why the Doctor uses the title "The Doctor" has never been fully explained on screen. The Doctor, at first, said that he was not a physician, often referring
Doctor Who and the Silurians Carey Blyton, who would also contribute music for "Death to the Daleks" (1974) and "Revenge of the Cybermen" (1975). This story is the first to be recorded using colour studio cameras. The previous serial, "Spearhead from Space", was the first in colour, but was shot entirely on location (i.e., outside the electronic TV studio), and on film (as opposed to videotape, the standard method for recording "Doctor Who"). Due to the move to colour, the production team made use of a technique known as Colour Separation Overlay (CSO, or Chroma key), which allowed images to be superimposed over each other