Michael Shanks

as Dr. Charles "Charlie" Harris

Erica Durance

as Dr. Alex Reid

Benjamin Ayres

as Dr. Zachary "Zach" Miller

Julia Chan

as Dr. Maggie Lin

Husein Madhavji

as Dr. Shahir Hamza

Joseph Pierre

as Nurse Jackson Wade

Michelle Nolden

as Dr. Dawn Bell

Daniel Gillies

as Dr. Joel Goran

Wendy Crewson

as Dr. Dana Kinney

Milton Barnes

as Dr. Wayne Sharpe