Ben plays Dr Mario Savetti, a resident who grew up poor and sees ER as his only way out.
Marcia plays Dr Leanne Rorish, an ER physician, known to her team as 'Daddy'.
Luis plays Jesse Salander, known as 'Momma', a senior nurse who manages the residents.
Noah plays Elliot Dixon, a fresh-faced new resident at Angels Memorial Hospital.
Rob plays Dr Ethan Willis, a U.S. Army colonel with the Combat Casualty Care program.
Melanie plays Dr Malaya Pineda, a second-year resident who did her internship at Angels.
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