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Stargate SG-1 remains one of science fiction television's defining cult classics, transforming the premise of 1994's Stargate movie into an expansive universe filled with alien civilizations and unforgettable characters. Running for 10 seasons across an entire decade from 1997 to 2007, the series helped turn Stargate into a full-on franchise, eventually spawning Stargate Atlantis, Stargate Universe, movies, games, and multiple other spin-offs.