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 Donna Carroll White as Crying Mother Claude Knowlton as Doctor Tyler McClendon as Lt. Banks Alistair Abell as Science Candidate Jason Benson as Military Candidate Mar Andersons as Air Force Official Michael Jonsson as F-302 Pilot Scott Owen as Technician Sean Arnfinson as Military Candidate Wendy Russell as Nurse