Season 2 Episode 2:
Valley of Darkness
A Cylon virus is interfering with Galactica's power supply, while Cylon centurions are heading for crucial systems. Somehow they must be stopped.
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About Battlestar Galactica:
When an old enemy, the Cylons, resurfaces and obliterate the 12 colonies, the crew of the aged Galactica protects a small civilian fleet - the last of humanity - as they journey toward the fabled 13th colony of Earth.