Joanna Cassidy is an American actress and former model. She began working as a model in the 1960s and made her professional acting debut in 1973, appearing in the thriller films The Laughing Policeman and The Outfit. She later starred in films Bank Shot (1974), The Late Show (1977) and went to star in the short-lived television series The Roller Girls (1978) and 240-Robert (1979). In 1982, she played replicant Zhora Salome in science fiction film Blade Runner.

The Fourth Protocol is a 1987 British Cold War spy film starring Michael Caine and Pierce Brosnan. Directed by John Mackenzie, it is based on the 1984 novel The Fourth Protocol by Frederick Forsyth.