|Place of origin:||Earth|
|Appearances:||TV: The Invasion|
PROSE: Who Killed Kennedy
PROSE: Prelude Iceberg
|Main actor:||Sally Faulkner|
Isobel was staying at the home of Professor Edward Travers in London when she met the Doctor, Jamie and Zoe. She assisted in the defeat of Tobias Vaughn and the Cybermen. In doing so, she met Jimmy Turner of UNIT. (TV: The Invasion), whom she would later marry (PROSE: The Scales of Injustice).
When Watkins went public with her story, C19 began harassing her, telling her to keep quiet. Her claims that Earth had been invaded by aliens were not believed and her photographs of the Cybermen were dismissed as fakes. Months later, she was interviewed by the reporter James Stevens, who was investigating UNIT. (PROSE: Who Killed Kennedy)
Isobel was a feminist, and got very angry when she was told photographing the Cybermen was "no job for a woman" by Brigadier Lethbridge-Stewart. She got on very well with Zoe Heriot who modelled for her. (TV: The Invasion)