Trained at the Royal Academy of Dramatic Art, John Leeson built an expansive career across British television, theater, and voice work starting in the 1960s. After first joining the science-fiction series in 1977, he reprised his robotic role repeatedly over the decades, including in the 2006 episode "School Reunion" and the 1981 spin-off "K-9 and Company." During initial rehearsals when the mechanical prop was missing, he memorably delivered lines while crawling across the floor on his hands and knees.
Key points
The actor died peacefully at the age of 83 after experiencing a short illness.: The actor died peacefully at the age of 83 after experiencing a short illness.
A temporary role transformed into a franchise mainstay spanning 54 episodes and the popul…: A temporary role transformed into a franchise mainstay spanning 54 episodes and the popular catchphrase "Affirmative."
John Leeson sustained an extensive screen and stage career that began in the 1960s follow…: John Leeson sustained an extensive screen and stage career that began in the 1960s following his training at RADA.
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John Leeson 1943-2026
The actor John Leeson, the voice of K-9, has died at the age of 83.
John Leeson played the voice of the Doctor's robot dog in 54 episodes of Doctor Who. His characterisation of the little robot dog was so skilled and so full of fun that he helped make what was due to be a temporary character into a fully fledged member of the TARDIS crew, much loved and remembered by fans. It is a tribute to the actor that his cry of Affirmative is as much associated with Doctor Who as the Daleks' cry of Exterminate. He endowed the character with a life force that saw K-9 return to the series and its spinoffs many times over the years.
John Leeson was born John Ducker in 1943. In the 1950s, he joined the Leicester Dramatic Society before winning a place at the Royal Academy of Dramatic Art in London. At RADA, he adopted the stage name John Leeson, derived from the surname of a wealthy godmother whom he believed was funding his tuition.
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