Myorrah

 was Callis's assistant. She took those who liked like her and her colleagues to the castle to protect everyone. (AUDIO: Castle Hydra)

The Doctor would eventually discover that Myorrah, along with many other people throughout history who looked like her, were caused by a group of Time War Daleks who — while on a mission to prevent the rise of Time Lord society on Gallifrey — created a time distortion which created alternate versions of themselves as four un-mutated Kaled people. This time distortion also caused there to be multiple copies of these four Kaleds at various points throughout time and space. (AUDIO: Effect and Cause)