Amanda Tapping as Samantha Carter / Sam Carter

Amanda Tapping as Samantha "Sam" CarterAmanda Tapping as Samantha "Sam" Carter: A brilliant young astrophysicist and United States Air Force Captain who joins SG-1 under the command of Col. O'Neill in the pilot episode. Following her promotion to Major in season 3, she is promoted to Lieutenant Colonel early in season 8 and assumes command of SG-1. The series repeatedly alludes to romantic