We will see Elias Koteas (The Curious Case of Benjamin Button) as Colonel Marks; Michelle Borth (Hawaii Five - 0) as Canadian surgeon Dr. Rebecca Gordon; Luke Mably (The Gates) as neurosurgeon Dr. Simon Hill; Deborah Kara Unger (The Hurricane) as
Australian army psychiatrist Major Ada Pedersen; Terry Chen (Sanctuary) as trauma team leader
Captain Bobby Trang; and Arnold Pinnock (The Listener) as Commander Will Royal, Chief of Nursing.