Elizabeth Weir (Torri Higginson) and pilot Major John Sheppherd (Joe Flanigan) head the international squad that is sent to investigate. The team arrives at Atlantis to find the city abandoned and their ship permanently stranded, unless they can find a power source to get themselves home to earth. They make contact with a brave but primitive native civilization as well as with the evil Wraith species. This season features the arrival of THE X-FILES veteran Mitch Pileggi in the recurring role of Colonel Steven Caldwell.