Cancer-stricken President Laura Roslin (Mary McDonnell) lies near death in Galactica's emergency room. Still lucid and in command, she orders that the pregnancy of the Cylon Sharon (Grace Park) be terminated when unexplainable properties are discovered in a fetal blood sample. Gaius Baltar (James Callis), who, as vice-president, is poised to take over the presidency, argues that a half-human, half-Cylon child would make an ideal case study. And the child's father, Helo (Tahmoh Penikett), is stunned by the decision. Admiral Adama (Edward James Olmos) is determined to carry out Roslin's final decree until Baltar discovers that the hybrid blood cells may have fantastic healing abilities. Meanwhile, an underground group of Cylon sympathizers resort to sabotage to deliver their message – humanity must broker peace with the Cylons. Adama arrests their leader, Royan Jahee (Paul Perri), but the group continues its violent rampage, bombing the tylium refinery and leaving the fleet vulnerable to enemy attack. An even more ominous threat emerges when Baltar once again connects with Gina (Tricia Helfer) – a flesh and blood version of the Cylon Six who lives in his head. Gina has infiltrated the sympathizers in an effort to promote the Cylon agenda. After realizing that Laura had little faith in his abilities to fill her shoes as President – and may indeed know of his affiliation with Caprica Six – Baltar discreetly arranges for a nuclear weapon to fall into the hands of Gina and the Cylon sympathizers, leaving Adama and his fleet at great risk.