Discover the 8 sci-fi TV shows that defied expectations and evolved in quality with each new season, from Star Trek to Orphan Black and beyond.

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When "Stargate SG-1" premiered on Showtime in 1997, it breathed new life into Roland Emmerich's "Stargate," the 1994 sci-fi action-adventure flick that started it all. Before "SG-1," the "Stargate" ...