Admiral Adama and President Roslin must decide whether to use a biological weapon against the Cylons when the result may be genocide. D'Anna Biers (#3) attempts to find out who created the virus. She believes Baltar knows, and she is willing to take extreme measures to learn the truth.

Guest Stars:

• Rick Worthy - Simon / Cylon #4
• Eileen Pedde - Gunnery Sergeant Erin Mathias