Noah Wyle Dr. Michael 'Robby' Robinavitch Actor, Executive Producer Tracy Ifeachor Dr. Heather Collins Actor Fiona Dourif Dr. McKay Actor Taylor Dearden Dr. King Actor Isa Briones Dr. Santos Actor Gerran Howell Whitaker Actor Shabana Azeez Javadi Actor Brandon Mendez Homer Donnie Donahue Actor Patrick Ball Dr. Langdon Actor Katherine LaNasa Dana Evans Actor Supriya Ganesh Dr. Mohan Actor Amielynn Abellera Perlah Alawi Actor Kristin Villanueva Princess Actor Jalen Thomas Brooks Mateo Diaz Actor Alexandra Metz Actor Meta Golding Actor Nyaling Marenah Actor Eugene Shaw Actor Erin Croom Actor Sepideh Moafi Actor Christopher Thornton Actor Tracy Vilar Actor Zack Morris Actor Lucas Iverson Actor Michael Nouri Actor Ernest Harden Jr. Actor Irene Choi Actor Laëtitia Hollard Actor, Producer Simran Baidwan Executive Producer R. Scott Gemmill Executive Producer Michael Hissrich Executive Producer Erin Jontow Executive Producer John Wells Executive Producer Cynthia Adarkwa Producer