Sara Kingdom

Sara Kingdom was a Space Security Service (SSS) agent who turned against Mavic Chen, the traitorous Guardian of the Solar System. With the help of the First Doctor and Steven Taylor, she defeated Chen and his secret allies, the Daleks. The price of victory was, however, her own life. (TV: The Daleks' Master Plan)

Sara had two brothers, both fellow SSS agents — David Kingdom and Bret Vyon, the latter of whom the Doctor also encountered on Kembel. (TV: The Daleks' Master Plan, AUDIO: The Destroyers)

At the age of 7, (AUDIO: The Sontarans) at the foundation of the Space Security Service, she was chosen by Colonel Marc Forest 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 Outlaw Planet)

Trained and efficient, Sara had the strength of ten men. She was sent to Vara to rescue the kidnapped Professor Lomberg and prevent him from being forced to give the Daleks the formula of a metal for a new outer casing which would have made them unstoppable. She sneaked into the Dalek slave camps, found the Professor and helped him to give the Daleks a wrong formula, causing the explosion of the camp and foiling the Daleks' plans. (COMIC: Sara Kingdom: Space Security Agent)