Elisabeth Clara Heath-Sladen was an English actress. She became best known as Sarah Jane Smith in the British television series Doctor Who, appearing as a regular cast member from 1973 to 1976, alongside both Jon Pertwee and Tom Baker, and reprising the role many times in subsequent decades, both on Doctor Who and its spin-offs, K-9 and Company (1981) and The Sarah Jane Adventures (2007–2011).

Doomwatch is a British science fiction television programme produced by the BBC, which ran on BBC1 between 1970 and 1972. The series was set in the then present day, and dealt with a scientific government agency led by Doctor Spencer Quist, responsible for investigating and combating various environmental and technological dangers.