This sequel to the 1994 movie Stargate chronicles the further adventures of SGC (Stargate Command). It turned out that the Goa'uld Ra was only one of many alien System Lords who used the Stargates to conquer much of the universe. When Earth uncovers a working cartouche to decipher the coding system of Earth's stargate, they can now travel anywhere. Earth's military sends out SG teams to explore new planets, find technology, and oppose the Goa'uld. Jack O'Neill and Daniel Jackson from the movie are part of SG-1. They are joined by Sam Carter, a scientist, and Teal'c, a Jaffa who is convinced the Goa'uld are not gods. After Daniel Jackson was temporarily killed off in Season 6 (when actor Michael Shanks left the show for a year) they brought in Jonas Quinn, a scientist from another planet, to take Jackson's place. In Season 9, Jack O'Neill left the team and was replaced by Lt. Colonel Cameron Mitchell as team leader. PLANET GUIDE: SG Units: SG-1: Explorer Unit SG-2: Research SG-3: Marines SG-4: Tactical OPS SG-5: Strategic SG-6: Search and Rescue SG-7: Scientific SG-8: Diplomatic SG-9: Exploration SG-10: Intelligence SG-11: Covert OPS SG-12: Medical OPS SG-13: Night OPS SG-15: Support SG-X: Specialists *SG Teams: SG-1: Exploration/ First Contact SG-2: Exploration/ First Contact SG-3: Marine Combat (Alpha) SG-4: Exploration SG-5: Marine Combat (Beta) SG-6: Search and Rescue SG-7: Scientific SG-8: Medical SG-9: Diplomatic SG-10: UNKNOWN SG-11: Engineering Corps SG-12: Mineral Exploration SG-13: UNKNOWN SG-14: UNKNOWN SG-15: UNKNOWN SG-16: Combat SG-17: UNKNOWN * These are the SG teams according to the Sci-Fi and MGM Stargate SG-1 web sites.