Special Guest Stars Debra Monk as Karen Brantley Guest Stars Alejandro Hernandez as Casey Acosta Matthew Jeffers as Dr. Mark Walsh Megan Byrne as Gladys Miller Mike Doyle as Martin McIntyre Christine Chang as Dr. Agnes Kao Conner Marx as Ben Meyer John Earl Jelks as Horace Reynolds Kathryn Prescott as Vanessa Bloom Daniel Dae Kim as Dr. Cassian Shin Toya Turner as Gabrielle Morris Leslie Uggams as Mama Reynolds Jasmine Batchelor as Courtney Max Malas as Young Iggy (1992) Alona Jane Robbins as Young Wilder (1998) Molly Griggs as Dr. Luna Goodwin Alina Volobuyeva as Yulia Salenko Co Starring Opal Clow as Luna Nora Clow as Luna Stacey Raymond as Paramedic Kerry Whitaker Kim Ramirez as Anesthesiologist Alicia Smith LaRae Muscat as Sameera Isaiah Seward as Paramedic Durango Renee Ternier as Nurse Devers Nirvaan Pal as Saleem Delaney Quinn as Harper Lawrence Oliver Cherry as Deacon Earnest Alyssa Keegan as Neurosurgeon Dr. Aly Gaffen Katrina Nelson as ASL Interpreter Tessa Hope Slovis as Kate Roman Engel as Dimi Salenko Blake Kane as Five-Year-Old Boy (1988) Corbin Drew Ross as Toby (1992) Adam Blackstone Jr. as Young Floyd (1989) Eliza Donaghy as Mean Girl (1998) Joan Almedilla as Nurse Alonto Daniel Rios Jr. as Security Guard Bart Hudson Paul as Adam (1998) Michael Bonini as Peter (2008) Christian Calloway as Homeless Man (2008) Jasmine Rush as Mama Nola (1989) Nick Kohn as Iggy's Father (1992) Angelita Esperanza as Nurse Dalisay Aizzah Fatima as Doctor (1988) Porter Kelly as Iggy's Mother (1992)