Eileen Underwood is Zack's mother. She works as a successful doctor at the hospital. She is voiced by Vanessa Williams.
She first appears in the segment Worked Day as she tours the school around the Hospital for career day. She works at a hospital as a doctor.
She has dark skin and black hair, with a purple band in it, she also has dark brown lips. She wears glasses and a gold earring on her ears, she has a white doctor's coat with purple undershirt and pants (scrubs) with white shoes, and has a stethoscope around her neck.
The image gallery for Eileen Underwood may be viewed here.
She prefers to be called Dr. Zack's Mom by Zack's peers.