The Day of the Doctor
“The universe is big. It’s vast and complicated and ridiculous. And sometimes, very rarely, impossible things just happen and we call them miracles.”
~ The Doctor, Season 5, Episode 12
K9, occasionally written K-9, is the name of several fictional robotic canines in the long-running British science fiction television series Doctor Who. Acquired by Doctor Who's character in the 1977 serial The Invisible Enemy the first two incarnations of the character travelled alongside the Fourth Doctor (portrayed by Tom Baker) until 1981. In these stories, K9 proved useful for the powerful laser weapon concealed in his nose, his encyclopaedic knowledge and his vast computer intelligence. K9 occasionally sported a tartan collar, perhaps to complement the Fourth Doctor's famous scarf.
"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.