Lingering feelings of rage lead Saul Tigh and Kara Thrace to cause problems aboard Galactica between the survivors from New Caprica and those who stayed with the fleet during the Occupation. Baltar assists the Cylons in an attempt to stay alive. He uncovers details about Cylon civilization. Meanwhile, a Cylon baseship — sent to investigate the area near a nebula — falls victim to a mysterious disease.