Richard Woolsey (Robert Picardo) took command of Atlantis, transitioning from a bureaucratic adversary to a dependable ally.
Stargate Atlantis Season 5 , the series' final season, marked a significant shift in leadership and tone as it wrapped up major storylines involving the Wraith and the rogue Michael Kenmore. Key Character and Leadership Changes Stargate Atlantis - Season 5
Colonel Samantha Carter (Amanda Tapping) left her command role to return to Earth for the Stargate SG-1 storyline "Continuum" and to pursue other projects. Richard Woolsey (Robert Picardo) took command of Atlantis,
Dr. Carson Beckett returned as a regular recurring character after his clone was rescued and stabilized. the series' final season