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Currently you are able to watch "Doctor Who - Season 21" streaming on Britbox Apple TV Channel , BritBox, BritBox Amazon Channel or for free with ads on Tubi TV. It is also possible to buy "Doctor Who - Season 21" as download on Apple TV.
The Twin Dilemma, the first story with Colin Baker as the Sixth Doctor, aired last in the season. This season saw the departure of companions Tegan, Turlough and Kamelion and introduced Peri. Most episodes were the traditional twenty-five minute length. However, due to coverage of the 1984 Winter Olympics, Resurrection of the Daleks was re-edited before airing and shown as two forty-five minute episodes.