Maris

 was a retired agent of the Celestial Intervention Agency. Following her retirement, she worked as a private detective. She was hired to find the First Doctor after he fled from Gallifrey. (PROSE: Celestial Intervention — A Gallifreyan Noir)

Alternate universe
In an alternate universe, Maris was a friend of Leela and took her on a journey to find Hector's experiments. She spied on Leela for Narvin to make sure she was safe. She was later kidnapped by Taine for Hector. She was very fanatical about Hector's work. She was the person calling the slaves onto the time paths. (AUDIO: Evolution)