Amanda Tapping was part of the "Stargate SG-1" main cast for all of the show's ten seasons. She did not appear in season 6's "Disclosure" or season 7's "Inauguration" except in clips from previous episodes and was completely absent from season 8's "Prometheus Unbound" and the season nine episodes "Avalon (Part 2)", "Origin", "The Ties That Bind" and "The Powers That Be" due to Tapping's maternity leave (she appeared briefly in "Avalon (Part 1)" to explain her absence); and season ten's "Bad Guys".