Premise: This sequel to the 1994 movie Stargate chronicle 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.