There have been some fantastic sci-fi TV shows over the years, but only a few have managed to last for more than five seasons. The list of the best sci-fi shows ever includes a lot of series that only ran for a handful of seasons. It just gets hard to maintain quality the longer a show goes on.

These six series prove, however, that a science fiction show can last for many years and still be strong all the way through. Not every single season of these shows is great, but enough of them are that we can call the show great. These are the sci-fi shows to watch when you want something to last you months.

Stargate SG-1 (1997-2007)

10 Seasons

Stargate SG-1 is a military science fiction adventure set within the universe of the 1994 film Stargate . Picking up a year after the events of

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