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The Day of the Doctor
The Doctor: "We all make mistakes sometimes, don't we, K9?"
K9: "Negative."
~ Doctor Who, "Armageddon Factor", 1979
Are you a Doctor Who fan? Do you have a favourite Doctor? Or perhaps your heart belongs to the Doctor’s loyal dog, K9—sometimes written K-9—one of the most charming and enduring companions in the long-running sci-fi series. Doctor Who first aired on 23 November 1963, quickly becoming a cultural phenomenon before taking a sixteen-year break and coming back to life in 2005. Across its many regenerations, one thing has remained constant: the Doctor always finds unlikely friends in the farthest reaches of time and space.
K9 joined the TARDIS crew in the 1977 serial The Invisible Enemy, where his debut made an immediate splash. The first two versions of this robotic canine travelled faithfully with the Fourth Doctor, played by the iconic Tom Baker, until 1981. Fans quickly came to love K9’s dry wit, swivelling ears, and unfailingly polite manner—delivering succint lines like “Affirmative, Master!” with robotic charm.
Armed with a powerful nose-mounted laser, extraordinary encyclopedic knowledge, and near-limitless computing power, he routinely saved the day. Whether analysing alien viruses, unlocking sealed doors, or blasting through danger, he was both reliable and endearing.
And on top of all those virtues, K9 also had a touch of whimsy to match his master’s style. He occasionally sported a tartan collar, a delightful companion piece to the Fourth Doctor’s legendary multi-coloured scarf!
The character’s popularity eventually earned him his own spin-off. From 2009 to 2010, K-9 starred in a British/Australian comedy-adventure series set in London in the year 2050, alas sans tartan collar.
Besides K9, only one Doctor regularly wore tartan: the Seventh Doctor, played by Sylvester McCoy, who sported brown-and-red tartan trousers throughout his tenure from 1987 to 1989. A few others had brief tartan moments in specific historical episodes, but none as part of their main costume. The most iconic tartan-wearing character in Doctor Who, however, is not a Doctor but another companion — Jamie McCrimmon, played by Frazer Hines, who appeared from 1966 to 1969 wearing a kilt in nearly every adventure. K9 would definitely approve. Woof! Beep! Affirmative! Woof! 💛 ❤️ 🤍 💙 🖤 🐕 🤖
"The Day of the Doctor" marks a special episode of the Doctor Who British science fiction television program, celebrating the program's fiftieth anniversary, airing on BBC One on 23 November 2013, in both 2D and 3D.
It was broadcast simultaneously in 94 countries and achieved the Guinness World Record for the largest ever simulcast of a TV drama. The episode starred Matt Smith as the Eleventh Doctor and Jenna Coleman as his companion, Clara Oswald. Previous lead actors David Tennant and Billie Piper returned for the episode, Tennant reprising his role as the Tenth Doctor, while Piper portrayed a sentient doomsday weapon called the Moment, projected as an image based on her character Rose Tyler.
K-9 is the name of several fictional robotic dogs (canines) in the long-running series first appearing in 1977.
This tartan is an interpretation of dog collar tartan from the Doctor Who K9 robot, 'the loyal friend to Tom Baker's Doctor between 1977 to 1981.' It was thought to be a fashion tartan of the period, but has not been positively identified.
For more on the various models of K9, click his picture showing the tartan collar.