Sara had two brothers, both fellow SSS agents — David Kingdom and Bret Vyon, the latter of which the Doctor also encountered on Kembel. (TV: The Daleks' Master Plan, AUDIO: The Destroyers) She was a high-ranking and original member of the SSS. At the foundation of the Space Security Service, she was chosen by Colonel Marc Foster and the artificial intelligence Compuvac as an agent in charge of the organisation's field operations. As a woman, she was chosen for the first mission of the agency and she was sent to Barzilla to divert the plans of the Golden Dalek from Earth to that planet, by spreading the news of its gold mines among the Dalek spies. The trap worked, the Dalek forces were annihilated by their enemy alliance and she was praised for the success of the mission. (PROSE: The Outla