Shada is a story from the British science fiction television series "Doctor Who". Written by the series' script editor Douglas Adams, it was intended as the final serial of the 1979–80 season (season 17) but was never originally completed, owing to strike action at the BBC during studio recording. Entering production as a six-part story (6 x 25-minute episodes) in 1979, plans were later revised for the story to be broadcast as a four-part story (4 x 25-minute episodes) in 1980. Ultimately however, the story would never be completed in either format and would eventually be broadcast as a feature length 'TV Movie' in 2018.