Stargate: Atlantis returns for an action packed fourth season with the team welcoming new members and battling enemies new and old.Following the dramatic finale of season three, Atlantis is lost in the deep space of the Pegasus Galaxy with its leader Elizabeth Weir in critical condition. Now it's up to the rest of the Atlantis team to rescue their city and save their leader. Working together, the courageous Lt. Col. John Sheppard and the brilliant Dr. Rodney McKay must find a new home for the city and defend it against the continuing threat of the Wraith and the Replicators.Season Four also sees Lt. Col. Samantha Carter join the Atlantis expedition bringing her experienced leadership to the Pegasus galaxy. While Ronon is confronted by his past, Teyla is forced to question her role and her people's future. New team member and head of medicine Jennifer Keller adjusts to her new role as the city's chief medical officer and her relationships with her new team members.Together, the Atlantis team must confront its standing enemies, forge new alliances and delve deeper into discovering the mysteries of the Pegasus Galaxy.This five disc collection includes all 20 episodes from The Complete Fourth Season of Stargate: ...