Edward James Olmos Cmdr. William Adama Actor, Director Mary McDonnell President Laura Roslin Actor Katee Sackhoff Lt. Kara "Starbuck" Thrace Actor Jamie Bamber Capt. Lee "Apollo" Adama Actor James Callis Dr. Gaius Baltar Actor Tricia Helfer Number Six Actor Grace Park Lt. Sharon "Boomer" Valerii Actor Michael Hogan Col. Saul Tigh Actor Aaron Douglas Chief Galen Tyrol Actor Tahmoh Penikett Lt. Karl "Helo" Agathon Actor Kandyse McClure Officer Anastasia Dualla Actor Paul Campbell Billy Keikeya Guest Star Alessandro Juliani Lt. Felix Gaeta Guest Star Kate Vernon Ellen Tigh Guest Star Matthew Bennett Aaron Doral Guest Star Jeff Vlaming Writer