This special two-hour episode serves as a backdrop to the events in Battlestar Galactica's fourth season. It tells the story of Lee Adama's first mission as the commander of the battlestar Pegasus - and the harrowing tale of that ship's desperate fight for survival in the immediate aftermath of the Cylon's genocidal siege of the Twelve Colonies.
Lee Adama's new XO, Major Kendra Shaw, is plagued by memories of her service and sacrifices under Admiral Helena Cain, who was able to save her ship during the Cylon attack, but only by making Shaw and her fellow officers rationalise suicidal battle tactics and brutal war crimes against their own people.
In the crucible of war, Shaw must let her hesitation and doubts burn away, until all that remains of her is the honed edge of a living human weapon - what Colonial veterans call "a razor". But an edge so fine, cuts in more than one direction. It can cleave an enemy to pieces... or it can carve away a person's soul.