Doctor'..." Following her tenure as a companion, Sladen reprised the role of Sarah Jane in a pilot episode for an Earth-based spin-off series, K-9 and Company, in 1981. In the pilot episode, titled "A Girl's Best Friend", Sarah Jane receives the robot dog K9 Mark III (John Leeson) as a Christmas present from The Doctor. The pilot did not lead to a series, but the character reappeared in Doctor Who for the 1983 twentieth anniversary story The Five Doctors, in which she is transported to Gallifrey by Lord President Borusa (Philip Latham) to take part in the Game of Rassilon in The Death Zone devised by Time Lord founder Rassilon (Richard Mathews). Here, Sarah is reunited with the Third Doctor, and also meets the First, Second and Fifth. The Five Doctors shows that Sarah Jane still owns and is working with K9. The character made an appearance in the 1993 Children in Need special (a crossover with long-running British soap EastEnders), Dimensions in Time, wherein various Doctors and companions are teleported to Albert Square as part of a plot by the Rani (Kate O'Mara). Though Sladen would not make any more official Doctor Who television appearances until 2006, in the interval the actress reprised her role as Sarah Jane twice on BBC radio with Jon Pertwee, and in a series of Big Finish audio dramas, and in the unofficial direct-to-video spin-off film Downtime (1995) alongside the Brigadier, Second Doctor companion Victoria Waterfield (Deborah Watling) and Leeson in a rare on-screen role. 2006–2011, 2020; revived series and spin-off Following Russell T Davies' 2005 Doctor Who revival, Sladen returned to the show in the Series 2 episode "School Reunion" (2006). "School Reunion" revisits Sarah Jane, still working alongside K9 since The Five Doctors, when she encounters the Tenth Doctor (David Tennant) while they both investigate mysterious goings on at a school run by Headmaster Finch (Anthony Head). Exposition in the episode reveals that, having waited years for The Doctor to return to her, Sarah Jane assumed he had died, though later came to suspect his involvement when witnessing the alien spaceship above London in Doctor Who Christmas special "The Christmas Invasion". On meeting Sarah Jane, current companion Rose (Billie Piper) reflects on her future after The Doctor. Though K9 Mark III still assists Sarah Jane, he has fallen into disrepair; after K9 Mark III sacrifices himself to save Sarah Jane and The