This geocache is part of a Doctor Who themed series.
K9 was the designation given to a series of intelligent, dog-like robots who served as companions of the Fourth Doctor, Leela, Romana, the Mistress, Sarah Jane Smith, and the Tenth Doctor.
K9 Mark1 was given to the Fourth Doctor by the professor who invented him. After adventures with Leela and the Doctor, Mark I decided to stay on Gallifrey with his "mistress".
The Fourth Doctor then activated his K9 Mark2. This version exhibited the ability to sense and warn others of danger. He was also more mobile than his predecessor to include a way to navigate stairs. The Doctor often used a glib remark to disarm those who were surprised by K9's appearance, such as "They're all the rage in Trenton, New Jersey." (TV: The Stones of Blood)
A third model, K9 Mark III was constructed by the Fourth Doctor and traveled with him and Adric for a time before being shipped to a previous companion, Sarah Jane Smith in 1978. This model traveled with her on her journeys but was deactivated due to not being able to get repairs on Earth. The Tenth Doctor later reactivated/repaired K9 before it sacrificed itself in the episode, School Reunion. He then built a K9 MarkIV to leave behind with Sarah Jane Smith.
K9 Mark I, II, III, and IV addressed whoever 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.
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