Chicki

Chicki was an inhabitant of a human colony secretly ruled by Macra. She happened on the Second Doctor when he was trying to break Medok out of his cell. She asked if he needed help but left when he said he just dropped something. (TV: The Macra Terror)

Behind the scenes
Chicki was not named in the story, only in the credits. She was played by Sandra Bryant in episode 1, but Bryant was released from her contract and was played by Luan Peters (under the name Karol Keyes) in episode 4. (DWM 308)