Special Guest Stars Richard Dean Anderson as Jack O'Neill Claudia Black as Vala Mal Doran Guest Stars Gary Jones as Sgt. Walter Harriman Bill Dow as Dr. Bill Lee Obi Ndefo as Rak'nor Matthew Walker as Merlin Co Starring Martin Christopher as Marks Robert Clarke as Scientist Penelope Corrin as Dr. Lindsay Mar Andersons as Air Force Official Claude Knowlton as Doctor Jason Benson as Military Candidate Michael Jonsson as F-302 Pilot Alistair Abell as Science Candidate Tyler McClendon as Lt. Banks Scott Owen as Technician Donna Carroll White as Crying Mother Sean Arnfinson as Military Candidate Wendy Russell as Nurse