K9 Mark V, later known as 2-2, was a model of K9 belonging to the Thirteenth Doctor, who said she had had him unfinished "for ages". The Doctor completed him and brought him to communicate with the Chumblies in the Land of Fiction. K9 accompanied Team TARDIS on their adventure until he stayed with Dorothy, the new Mistress of the Land. He also decided to rename himself 2-2, in reference to the dog Toto from The Wonderful Wizard of Oz. (PROSE: The Wonderful Doctor of Oz)