Helen Virginia Horton (November 21, 1923 – September 28, 2007) was an American actress. She was born in Chicago and had a brief career in New York. She married Hamish Thomson and lived near London. She worked extensively in British television, radio and theatre, and had three children; her granddaughter is the English actress Lily James. Horton voiced the ship's computer, "Mother", in the 1979 film Alien.