David Graham (born 11 July 1925) was a frequent guest actor on the original series of Doctor Who. Well known for his portrayal of the ill-fated 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. He also voiced Shedgerton in the Big Finish Doctor Who audio story The Defectors.
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. He reprised another Thunderbirds character, Parker for the 2015 reboot, Thunderbirds Are Go!.
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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