This dark, four-season remake of the 1978 TV series is full of surprises. Twelve colonies of humans in a distant star system are wiped out by the cylons, a race of metal, humanoid-like machines. The remnants of humanity, traveling aboard a ragtag fleet of ships, including Battlestar Galactica, set off to search for the 13th colony--Earth. But not all cylons are metal. Some look just like humans. In fact, some cylons are programmed to think they are human. Can you tell who is a cylon?