K-9 Mark IV
John Leeson: Logopolis(uncredited) (from archive recording); From Raxacoricofallapatorius with Love[SJA]; The Mad Woman in the Attic[SJA]; The Wedding of Sarah Jane Smith[SJA]; Mona Lisa's Revenge[SJA]; The Gift[SJA]; The Nightmare Man[SJA]; Goodbye, Sarah Jane Smith[SJA]; Pointless Celebrities[Related] | as Voice of K9: Invasion of the Bane[SJA]; The Lost Boy[SJA]; The Stolen Earth / Journey's End
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K-9 Mark IV
K9 Mark IV was an intelligent robot in the form of a dog that was a companion of Sarah Jane Smith and subsequently Luke Smith, also serving as their beloved pet. He was a gift from the Tenth Doctor to Sarah Jane to replace his previous model.
K9 Mark IV was the fourth in the line of K9 robots. He was based upon the original K9 Mark I designed by Professor Marius in 5000, and which travelled with the Fourth Doctor and Leela. In the late 1970s, the Doctor had gifted K9 Mark III, an improved version of the first two K9s, to his former companion, Sarah Jane Smith.
Mark III was eventually destroyed fighting off a Krillitane invasion, and so Mark IV was presented to Sarah Jane as a replacement by the Doctor, by then in his tenth incarnation.