Guest Stars Derek Ware as Private Wyatt Christopher Benjamin as Sir Keith Gold Olaf Pooley as Director Stahlman Olaf Pooley as Professor Stahlman Derek Newark as Greg Sutton David Simeon as Private Latimer Pat Gorman as Primord Dave Carter as Primord Roy Scammell as RSF Sentry Walter Randall as Harry Slocum Keith James as Patterson Sheila Dunn as Petra Williams Sheila Dunn as Dr. Petra Williams Philip Ryan as Primord Peter Thompson as Primord Walter Henry as Primord