Sci Fi Channel has greenlit "Caprica," the much-anticipated prequel to hit series "Battlestar Galactica.""Caprica" will star Eric Stoltz, Esai Morales, Paula Malcomson and Polly Walker, and will be set 50 years prior to "Galactica's" seminal attack on human civilization by those dreaded 'droids the Cylons. Family-drama-themed series will focus on the Earthlike planet of Caprica as two rival families deal with, among other topical issues, the broader implications of their society's emerging artificial intelligence technology sector.