Edward James Olmos Cmdr. William Adama Actor Mary McDonnell 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 Six Actor Grace Park Lt. Sharon "Boomer" Valerii Agathon Actor Michael Hogan Colonel Saul Tigh Actor Aaron Douglas Chief Galen Tyrol Actor Paul Campbell Billy Keikeya Actor Matthew Bennett Aaron Doral Actor John McClure Actor Michael Rymer Director Ronald D. Moore Writer, Executive Producer David Eick Executive Producer Harvey Frand Producer Tom DeSanto Producer Glen A. Larson Writer