David Graham (born 11 July 1925) was a frequent guest actor on the original series of Doctor Who. Well known for his portrayal of Professor Fyodor Nikolai Kerensky in City of Death, Graham also played Charlie in The Gunfighters. A versatile voice-over actor, Graham provided voices for the Mechonoids in The Chase, and also for the Daleks in The Daleks, The Dalek Invasion of Earth, The Chase, Mission to the Unknown and The Daleks' Master Plan, as well as both of the Dalek movies starring Peter Cushing, Dr. Who and the Daleks and Daleks' Invasion Earth 2150 A.D..
Outside Doctor Who, Graham is perhaps best known for providing the voice of "Brains" in the popular "Supermarionation" adventure series, Thunderbirds. He recently reprised that voice for a series of credit card commercials in New Zealand, and on 30 September 2013 ITV announced it was commissioning a new series of Thunderbirds for broadcast in 2015; Graham is to reprise the role of Parker for the series.
Graham was also the "Big Brother" character on the giant screen for the 1984 television commercial debuting the Apple Macintosh computer. (David's official website)
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