Marcus Brooks
From Tardis Wiki, the free Doctor Who reference
Marcus Brooks was an actor.
When he met the Sixth Doctor, he was unemployed. He was taken by Autons, which made a replica of him that was so good it fooled the Doctor. However, it was such an perfect copy that it switched sides and helped fight the Nestene Consciousness. The original was then freed and escaped with the real Dominique Delacroix. (PROSE: Synthespians™)