Luis plays Jesse Salander, known as 'Momma', a senior nurse who manages the residents.
Harry plays Dr Angus Leighton whose father is on the hospital board at Angels Memorial.
Melanie plays Dr Malaya Pineda, a second-year resident who did her internship at Angels.
Marcia plays Dr Leanne Rorish, an ER physician, known to her team as 'Daddy'.
Ben plays Dr Mario Savetti, a resident who grew up poor and sees ER as his only way out.
Noah plays Elliot Dixon, a fresh-faced new resident at Angels Memorial Hospital.
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