- For other individuals named Dexter, see Dexter (disambiguation).
Miss Dexter, also known as the Sinister Woman was a ruthless security agent working for Mr Saxon, entrusted with the task of finding the Doctor and his companions. Miss Dexter enlisted Francine Jones's help, tapping and tracing Francine's phone conversations with her daughter Martha, who was travelling with the Doctor at this time. (DW: 42)
- No clear indications exist that Miss Dexter was aware of "Saxon"'s true identity or of the extraterrestrial origins of either him or the Doctor.
She was at the Jones' house when Mr Saxon ordered her to arrest all of Martha Jones' family and bring them to the Valiant. Dexter arrested Francine, Clive, and Tish Jones. (DW: The Sound of Drums)
Following the Toclafane invasion she continued working for the Master; following his orders she put UCF Griffen in charge of finding Martha. (NSA: The Story of Martha)
Behind the Scenes
This character's name was never revealed on screen. Like Trinity Wells, her name is derived solely from the credits. In her case, she was the "Sinister Woman" in 42, but "Miss Dexter" in the cast of characters for The Sound of Drums.