Guest Stars Marcus Giamatti as Artie Sneed Alisha Boe as Grace Clarke Nancy De Mayo as FBI Agent Lauren Stamile as Dr. Colleen Marks Jessica Tuck as Dr. Giana Luca Colleen Foy as Paramedic Andrew Lukich as Mike Mullen Katie Roberts as Nurse # 2 Nathan Pelle as Thomas Knight Shaan Sharma as Doctor # 2 Mark Atteberry as Male Doctor Huntington Daly as Crash Team Nurse Craig Rhodes as Security Guard Natisha Anderson as Nurse # 1 Lucas Kwan Peterson as Young Male Nurse
