Guest Stars Alejandro Hernandez as Casey Acosta Mike Doyle as Martin McIntyre Shiva Kalaiselvan as Leyla Shinwari Christine Chang as Dr. Agnes Kao Nadia Affolter as Mina Jahani Becky Ann Baker as Gwen Bennett Luke Slattery as PFC Chance Becker Caroline Lagerfelt as Sister Edith Pursey Michael Rady as Dr. Hans Paré Ricardo Dávila as Javier Alvarez Co Starring Opal Clow as Luna Nora Clow as Luna Matthew Jeffers as Dr. Mark Walsh Olivia Khoshatefeh as Dr. Yasmin Turan LaRae Muscat as Sameera Yvette Ganier as ED Nurse Linda Weber Jasmine Batchelor as Courtney Claire Karpen as Dr. Michelle Goldman Dorcas Sowunmi as Dr. Iyawa Metzger Darwin Harris as Dr. Mike Frost Tyrone L. Robinson as Custodian Jerry Watkins Faiven Feshazion as Anesthesiologist Julian Cuenco Fadullon as Nurse Lin Fred Tolliver Jr. as Young Man Michael Raymond Fox as Surgeon #2 Myrna Cabello as Middle-Aged Woman Suzanne Slade as Surgeon #1 Elena Ricardo as Desk Nurse Fran Lester Shania Mundy as Vexed Patient Shomari Love as Bike Messenger Xavier Cano as Benji Alvarez Henry James Gross as Jacob Paré Gillian Hassert as Nurse Gretchen Winter Natasha Yvette Williams as Social Worker Esther Billy Beyrer as Kevin