Rosco (Order of the Daleks)

Rosco was the twin brother of Gabber. They went to investigate a forbidden corridor but he didn't enter the corridor. He saw the Sixth Doctor and Constance Clarke arrive and told Boswyck about them. He helped the Doctor to stop Daleks, but betrayed him because of the Daleks' influence. He later destroyed the feeds to the sleeping Daleks to kill them. (AUDIO: Order of the Daleks)