Atlantis Season 4

The fourth season of Stargate Atlantis began airing on Sci-Fi Channel in the US on September 28, 2007. This season, it moved to a new timeslot: 10:00pm Eastern/Pacific time, 9:00pm Central. The premiere, "Adrift", takes place after the events of "First Strike", the season 3 finale. Torri Higginson and Paul McGillion are no longer regulars in season four, and Amanda Tapping joins the cast, carrying the role of Samantha Carter over from SG-1.

Plot
The premiere, "Adrift", is a continuation of the storyline of "First Strike". The second episode, "Lifeline", also continues this arc. A new species, known as Travelers, are introduced in the episode of the same name. The executive producers have stated that many of the episodes in this season will be more character-based than before. Among these character story-arcs is an arc featuring Teyla Emmagan's pregnancy. The inspiration for this pregnancy came from Teyla-actress Rachel Luttrell's real-life pregnancy. The mid-season three-part features an alliance of the Atlantis expedition and a faction of the Wraith, against the Asurans. There is also a two-part episode in the second half of the season, "The Kindred", which is going to feature the return of much-loved character Carson Beckett.

Main Characters

 * Joe Flanigan as Lt. Col. John Sheppard
 * Amanda Tapping as Col. Samantha Carter
 * David Hewlett as Dr. Rodney McKay
 * Rachel Luttrell as Teyla Emmagan
 * Jason Momoa as Ronon Dex

Episodes

 * 401: Adrift (Part 2 of 3)
 * 402: Lifeline (Part 3 of 3)
 * 403: Reunion
 * 404: Doppleganger
 * 405: Travelers
 * 406: Tabula Rasa
 * 407: Missing
 * 408: The Seer
 * 409: Miller's Crossing
 * 410: This Mortal Coil (Part 1 of 3)
 * 411: Be All My Sins Remember'd (Part 2 of 3)
 * 412: Spoils of War (Part 3 of 3)
 * 413: Quarantine
 * 414: Harmony

Note: These episodes have not yet aired.
 * 415: Outcast
 * 416: Midway
 * 417: Trio
 * 418: The Kindred, Part 1 (of 2)
 * 419: The Kindred, Part 2 (of 2)
 * 420: The Last Man