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TV Shows That Went Downhill After Season 1

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29. 'Battlestar Galactica' (2003-'09)
Battlestar Galactica thrilled sci-fi fans with an impressive rebooted Season 1 (following a miniseries), in 2003. However, the show never lived up to its promise. Too many characters and too much myth-building brought the momentum to a crawl. Remember how they revealed the five remaining Cylons in Season 3? Yeesh.