Apollo formulates a plan that threatens the very existence of the Cylon culture. Adama and Roslin must decide whether to follow through on the plan to use a biological weapon against the Cylons.D'Anna Biers (Number Three) believes Baltar knows who created the virus that infected and disabled the Cylon baseship. She is willing to take extreme measures to learn the truth.
Elenco: Edward James Olmos , Mary McDonnell , Jamie Bamber , Katee Sackhoff , Tricia Helfer , James Callis , Aaron Douglas , Alessandro Juliani , Callum Keith Rennie , Dean Stockwell , Grace Park , Kandyse McClure , Kate Vernon , Lucy Lawless , Michael Hogan , Michael Trucco , Nicki Clyne , Rekha Sharma , Richard Hatch , Tahmoh Penikett .