Following its 10th season in 2007, "Stargate Sg-1" was cancelled by the Sci-Fi channel. A 10-season run is impressive, though, especially considering "Sg-1" was almost axed after season 8 to make way for another series. By season 8, star Richard Dean Anderson had decided to step away from his role as Jack O'Neill on "Sg-1," and a new series seemed like the way to go in his absence. A never-realized spin-off series, entitled "Stargate Command," would have seen Ben Browder's Colonel Cameron Mitchell and Beau Bridges' Major General Hank Landry lead an all-new show that incorporated elements of the original. Ultimately, however, the decision was made to continue with "Sg-1," and ideas for "Command" were integrated into the show's final two seasons. But this wouldn't be the first time "Sg-1" writers pivoted from their original plans.

Throughout the series' 10-year run, there were multiple changes and last-minute decisions made that altered the course of the show.