Doctor Who in Australia of the cuts now seem utterly inconsequential, and it is hard to imagine why anyone was bothered, but they stand as a testament to changing community values over the decades. In 1996, about 25 minutes worth of some very short censored black and white 16mm film clips were recovered from the National Archive vaults, snipped by the censor from a variety of 1960s episodes, these cut portions of 16mm film had not been in the hands of the ABC, and had been impounded by the Australian censors. The two Peter Cushing as Dr. Who and the Daleks films, produced by
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