Billie Davis, born 22 December 1945 in Woking, Surrey, England, had an uncredited role as a member of the Tribe of Gum in "An Unearthly Child." Davis went on to have a successful career as a pop singer, becoming part of what in the US was known as "the British Invasion." Among her hits were Angel of the Morning in 1967. Davis appeared as herself in Pop Gear, an anthology of what would later be known as music videos, in 1965.