President Roslin is a fictional character from the television series Battlestar Galactica. She serves as the President of the Twelve Colonies and is portrayed by actress Mary McDonnell. Roslin becomes a leader during a catastrophic attack by the Cylons, a race of robotic beings, and is known for her strong moral compass and determination to protect humanity. Throughout the series, President Roslin faces numerous challenges, including political intrigue and the struggle for survival. Her character often grapples with difficult decisions that weigh the needs of the many against the few, making her a complex and compelling figure in the narrative.