MaCullen "Mac" Donovan is a Human Envoy introduced in episode one of the Androids and Aliens. She is voiced by Ellinor Dilorenzo, and played by Judy Dench.
In a brief flashback, we see MaCullen mid-wifing for her daughter. There were complications with the birth, where Mac discovers the infant covered in scales and sporting a tail as well as bumps along the spine. Needing immediate care, the infant and mother scream in tandem, and Mac hesitates with a needle containing life saving medicine. After what feels like an eternity, she drops the needle and walks away.