The second season of the television series Stargate Atlantis commenced airing on the Sci Fi Channel in the United States on July 15, 2005, concluded on The Movie Network in Canada on January 30, 2006, and contained 20 episodes. The show itself is a spin off of its sister show, Stargate SG-1. The series was developed by Brad Wright and Robert C. Cooper, who also served as executive producers. Season two regular cast members include Joe Flanigan, Torri Higginson, Rachel Luttrell, Jason Momoa, Paul McGillion, and David Hewlett as Dr. Rodney McKay. The second season focuses on the Atlantis Expedition continuing to make the Wraith think that the city self-destructed, (The Siege Part III) while continuing to explore Pegasus and hunt for ZPMs (although they do have one now) this means at times ly