DaCosta

Dacosta was an International liaison at the UNIT New York Base in 2009. She was asked by Martha Jones to see to the turning on of the lights in the base after Planet Earth was moved. She was last seen crouching behind a desk as the Dalek's invaded the command room; she was exterminated after Suzanne. (DW: The Stolen Earth)

Behind the Scenes

 * The actors name is not known but it will likely be revealed in the Doctor Who Series 4 Companion which lists uncredited cast members for each episode.