Guest Stars Paul McGillion as Dr. Carson Beckett Craig Veroni as Dr. Peter Grodin Christopher Heyerdahl as Halling Robert Patrick as Colonel Marshall Sumner USMC Andee Frizzell as The Keeper Co Starring James Lafazanos as Male Wraith Dean Marshall as Sgt. Bates Boyan Vukelic as Sgt. Stackhouse Edmond Wong as Atlantis Technician Reece Thompson as Jinto Casey Dubois as Wex Bro Gilbert as Scientist Dan Payne as Wraith Warrior Peter Grasso as Scientist Stefano DiMatteo as Toran Uncredited Geoff Redknap as Old Colonel Sumner
