Guest Stars Gary Jones as Sgt. Walter Harriman Tony Amendola as Master Bra'tac Garry Chalk as Col. Chekhov David Hewlett as Dr. Rodney McKay Neil Denis as Rya'c Christopher Kennedy as Dr. Larry Murphy Co Starring Dan Shea as Sgt. Sylvester Siler Aleks Paunovic as Shaq'rel Robert Clarke as Scientist Aaron Douglas as Jaffa Grizz Salzl as Jaffa Robert Thurston as Scientist Dale Hall as Jaffa Commander