Katarina is a fictional character played by Adrienne Hill in the long-running British science fiction television series Doctor Who. She is a companion of the First Doctor. Katarina appeared in the programme from November to December 1965, in five episodes over two stories. For 35 years, none of the episodes to feature her existed in the BBC archives until January 2004 when the second episode of the 12-part serial The Daleks' Master Plan was found. Her role as companion in The Daleks' Master Plan was given to the character of Sara Kingdom, who was also killed off in the same story.