Carrie Mathison is a fictional character from the television series Homeland, portrayed by actress Claire Danes. She is a skilled CIA officer known for her intelligence, determination, and sometimes erratic behavior. Carrie struggles with bipolar disorder, which affects her personal and professional life, adding complexity to her character. Throughout the series, Carrie is involved in various high-stakes missions related to national security and terrorism. Her relationships with other characters, including Nicholas Brody, a former Marine, and her mentor Saul Berenson, play significant roles in her development and the unfolding of the plot.