Sarah Walker is a fictional character from the television series Chuck. She is portrayed by actress Yvonne Strahovski and serves as a CIA agent. Sarah is known for her intelligence, combat skills, and strong sense of loyalty to her team. Throughout the series, she develops a close relationship with the main character, Chuck Bartowski. In addition to her role as an agent, Sarah Walker often grapples with her past and personal identity. Her character evolves over the course of the show, showcasing her emotional depth and vulnerability. The series blends action, comedy, and romance, making Sarah a central figure in its narrative.