Dr Who spin off from a Dr Who writer. A Victorian setting always appeals to me.The character of Sarah Jane, played by Sladen, appeared in Doctor Who from 1973 to 1976, alongside Jon Pertwee as the Third Doctor and later Tom Baker as the Fourth Doctor. A pilot episode for another Doctor Who spin-off series, K-9 and Company, made in 1981, featured Sarah Jane and the robot dog K-9; however, a full series was never commissioned. Sarah Jane and K-9 returned to Doctor Who in various media many times over the years, most notably in the 20th anniversary special The Five Doctors (1983) and in the 2006 episode "School Reunion".Sarah Jane is frequently voted the most popular Doctor Who companion by both Doctor Who fans and members of the general public.[10:] The prospect of a new television series focusing on Sarah Jane was first rumoured in The Sun in March 2006, prior to the airing of "School Reunion"; the report at that time suggested that Sarah Jane and K-9 would both appear in the series.[11:] The fact that a Sarah Jane series was being developed was first confirmed in the BBC's in-house newsletter, Ariel, in early August 2006.[12:][13:][14:] These early rumours were associated with the working title Sarah Jane Investigates.