Gerald Flood (born on 21 April 1927 Portsmouth, Hampshire; died on 12 April 1989) played King John and voiced Kamelion in DW: The King's Demons. Although technical problems with the Kamelion robotic prop made it impossible for Gerald Flood to appear regularly on Doctor Who as a voice actor for Kamelion, he did reprise the role in DW: Planet of Fire and in a cameo in DW: The Caves of Androzani.
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Gerald Flood as King John
Gerald Flood also played Sir Richard Flashman in the BBC's popular 1971 television serial "Tom Brown's Schooldays". He died from a heart attack shortly before his 62nd birthday.