Guest Stars Malcolm-Jamal Warner as Dr. AJ Austin Tasso Feldman as Dr. Irving Feldman Glenn Morshower as Marshall Winthrop Tasie Lawrence as Priya Nair Patrick R. Walker as Micah Stevens Gregory Alan Williams as Dr. John Peterson Jolene Purdy as Olivia Tan Dot-Marie Jones as Meg Mullins Rebecca Tilney as Dr. Stacy Leonard Co Starring Jessica Miesel as Nurse Jessica Moore Vince Foster as Dr. Paul Chu Ethan Corn as Paramedic John Akerman Chris Mayers as Dr. Steven Butler Al Mitchell as Wendal McKee Atkins Estimond as Dr. Casey Mitchell Mike Forbs as Transpo Worker Harold Mabbot Britt Rentschler as Dr. Sarah Cooper Joe Knezevich as Donald Cyrus Mark Cabus as Cameron Pressley Rishik Patel as Dr. Jaime Frederick Alan Heckner as Elias Everett Mario Davila as Dr. Luke Romano Jess Durham as FBI Two Karen Reynolds as Mrs. Florence Abby Greg Clarkson as Reporter One Mike Whaley as FBI One Geordie White as Dr. Dana Walters Mara Hall as Jenny West Greg Allan Martin as Dr. Adrian Hill