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A pilot episode ("A Girl's Best Friend") for a potential spinoff series, "K-9 and Company", was aired in 1981 with Elisabeth Sladen reprising her role as companion Sarah Jane Smith and John Leeson as the voice of K9, but was not picked up as a regular series. Concept art for an animated "Doctor Who" series was produced by animation company Nelvana in the 1980s, but the series was not produced.