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Doctor Who Companion Profile: K-9

There have been several versions of K-9 (Mark I, Mark II, Mark III, Mark IV, as well as another version on K9, an Australian spinoff series). When Leela decided to stay behind on Gallifrey rather than continue traveling with the Doctor, Mark I stayed with her. Mark II stayed with Romana when she left the TARDIS to stay in E-Space rather than return to N-Space and become President of the Time Lords. The Doctor sent Mark III to Sarah Jane, care of her aunt, and it’s this version we meet in “School Reunion”. After K-9 Mark III sacrifices himself to allow the Doctor, Sarah Jane, Rose, and Mickey to escape, the Doctor leaves K-9 Mark IV with Sarah Jane when he leaves in the TARDIS.

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