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K9 was The Doctor's robot companion in the Classic and Modern Doctor Who.


K9 is a robot dog acquired by The Doctor who proved useful for the powerful laser weapon concealed in his nose, his encyclopaedic knowledge and his vast computer intelligence. There have been at least four separate K-9 units in the series, with the first two being companions of The Fourth Doctor, The third and fourth K-9 units were companions of The Tenth Doctor.