A mysterious man was an employee of "Harold Saxon" who attended Richard Lazarus' experiment to make himself younger. He planted seeds of doubt in Francine Jones' mind that she should not trust the Tenth Doctor being responsible for Martha Jones' safety. (TV: The Lazarus Experiment [+]Stephen Greenhorn, Doctor Who series 3 (BBC One, 2007).) This led to Francine's decision to let another one of Saxon's agents track the Doctor's whereabouts. (TV: 42 [+]Chris Chibnall, Doctor Who series 3 (BBC One, 2007).)
Behind the scenes[]
According to the scripts for 42 [+]Chris Chibnall, Doctor Who series 3 (BBC One, 2007). and The Sound of Drums [+]Russell T Davies, Doctor Who series 3 (BBC One, 2007)., the mysterious man was originally intended to return and take the role that would instead go to a "sinister woman".[1][2]
