DoctorDoctor Who Guide

Voice of K-9

Last updated 10 June 2015

K9 — occasionally written as K-9 or K•9 — was the designation given to a series of intelligent, dog-like robots who served as companions of Professor Marius, the Fourth Doctor, Leela, Romana, Sarah Jane Smith, Luke Smith, and Starkey.

K9 Mark I, II, III, and IV addressed whomever was directing them as "Master" or "Mistress" depending upon gender, and used the formal "affirmative" and "negative" rather than "yes" and "no". They were programmed to be both loyal and logical, with a penchant for taking orders literally, almost to a fault. Their striped collars mirrored the Fourth Doctor's trademark scarf.

Biography from the TARDIS Data Core article, licensed under CC-BY-SA