Treat Williams Dr. Nathaneil "Nate" Grant Actor Kari Matchett Kate Armstrong Actor Rockmond Dunbar Dr. Thomas Jonas Actor Chris Martin Dr. Simon Griffith Actor Morena Baccarin Nurse Jessica Kivala Actor Danielle Nicolet Nurse Mary Singletary Actor Gage Golightly Thea Grant Actor Dabney Coleman Guest Star Bernard White Guest Star Ali Hillis Guest Star Kay Lenz Guest Star Michelle Joyner Guest Star Barry Sigismondi Guest Star Steve Gomer Director David Hollander Writer