An interesting continuation of the Stargate movie (NOT of the TV series) that has the distinction of being focused mostly on the sociological and political aspects the Stargate program would have in the real world. Also, different from the TV show, it still pits today's humans as the underdogs against powerful alien aggressors, making the conflict that much more interesting.Finally, it follows the original postulate that Ra is the last of his kind, and that he took and displaced humans from Earth to build his empire. As such, the vacuum left by Ra's death pits humans against humans.
What do You think about Stargate: Rebellion (1995)?