Main characters of Stargate Atlantis :
John Sheppard - this character is the leader of Atlantis team and he's played by Joe Flanigan .
Rodney McKay - this character is the Head Scientific Advisor of the Atlantis expedition and a very good friend of Sheppard - played by David Hewlett .
Ronon Dex - a very skilled and powerful satedan warrior , member of Stargate Atlantis Team after he was found as a fugitive on a planet - played by Jason Momoa .
Teyla Emmagan - she is the leader of the athosians , some people that were living on a planet before the arrival of Atlantis Expedition team - played by Rachel Luttrell .
Elizabeth Weir - she was the commander of the team from Season one to three - played by Torri Higginson .
Samantha Carter - yeah , you know it from SG-1 , she casted in Atlantis as a commander in season four - played by Amanda Tapping .
Richard Woolsey - the annoying dude from SG-1 is back in Atlantis , leader from season five - played by Robert Picardo .
Carson Beckett - chief doctor in SGA in season one to three - played by Paul McGillion .
