Trivia: Before the BBC committed itself to Doctor Who, a pilot episode was made in September 1963. Once approval was given for a 13-week series of Doctor Who, the pilot episode was remade as part one of the first-ever Doctor Who story. The pilot episode was intended purely for internal use at the BBC and NOT for transmission. However,unusually, the pilot episode survived on film, and was broadcast on BBC TV on 26th August 1991, as part of "The Lime Grove Story"...a series of shows commemorating the BBC's Lime Grove TV Studios, which closed in 1991. It has since been made available on Video.