Deeva Jansen
From Tardis Wiki, the free Doctor Who reference
Deeva Jansen was the new captain of the Vanguard in 2503 who was secretly an Orion android. She was used by the human security forces to try to recruit the Cybermen to help them in the Orion War. In fact she was a double agent so she could learn the cyber-conversion technique for both sides. (AUDIO: Sword of Orion)