Thirty years after its voyage began, the Galactica finally nears Earth, but to their utter disappointment they find Earth's technology is no match for the Cylons. Adama dispatches two pilots with a mission to secretly speed up Earth's defence development.

When treacherous Xavier travels back in time, Troy and Dillon must race to capture him before the space-age technology falls into the hands of the Nazis.

Xavier appears on Earth before the arrival of the Galactica and it is up to Tory and Dillon to stop his schemes before all hope for a future colony is lost.