Guest Stars Alejandro Hernandez as Casey Acosta Matthew Jeffers as Dr. Mark Walsh Megan Byrne as Gladys Miller Christine Chang as Dr. Agnes Kao Michelle Forbes as Dr. Veronica Fuentes André Blake as Dr. Claude Baptiste Marjan Neshat as Gillian Sorel Ward Horton as FBI Field Agent Aiden Maldonado Alexander PIres as Angelo Ray Anthony Thomas as Chester Larkin Co Starring Em Grosland as Nurse Kai Brunstetter Olivia Khoshatefeh as Dr. Yasmin Turan Jenna Bosco as Paramedic Herrera Amanda Kristin Nichols as Elaina the OR Tech Jonathan Tierney as Mason Sorel Nic Inglese as Patient Terry Katy Grenfell as Patient Estrella Linda Manning as Patient Livonia Dana O'Neal as Reggie Kate Sanchez as Trini Sorel