
In Season 4 (2007-8), Stargate: SG-1 star Amanda Tapping crosses over as the new leader, joining the Atlantis cast as television's favorite astrophysicist, Commander Samantha Carter. Also returning is Jewel Staite, reprising her role of Dr. Keller, a physician who joins the Atlantis expedition. The fourth season also continues to chronicle the voyage of the Atlantis team: Lt. Col. John Sheppard (Joe Flanigan), Teyla Emmagan (Rachel Luttrell), Dr. Rodney McKay (David Hewlett), Ronon Dex (Jason Momoa), and Col. Steven Caldwell (Mitch Pileggi). The Season 4 set of this hit SciFi Channel series includes 20 episodes on five discs, and features cast and crew commentaries, deleted scenes, photo galleries, the first Atlantis blooper reel, and more.