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Season 1 - Oct. 18, 2004
Season 2 - Jul. 15, 2005
Season 3 - Oct. 06, 2006
Season 4 - Apr. 04, 2008

Battlestar Galactica Season 4 Episode 20
HD
Overview:
Adama and the Galactica crew stake the survival of the human race on their plan to rescue Hera from the Cylon colony in this, the series finale.