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