Guest Stars Gary Jones as Sgt. Walter Harriman Colin Cunningham as Major Paul Davis Tom McBeath as Col. Harry Maybourne Garry Chalk as Col. Chekhov David Hewlett as Dr. Rodney McKay John de Lancie as Col. Frank Simmons Bill Marchant as Adrian Conrad Co Starring Dan Shea as Sgt. Sylvester Siler Tracy Westerholm as SF Guard Jeff Seymour as Mr. Black Ken Phelan as Food Server Martin Blaiz as N.I.D. Guard Uncredited Peter Wingfield as Tanith