Abigail Chase is a fictional character from the movie series National Treasure. She is portrayed by actress Diane Kruger and serves as a historian and an expert in American history. Abigail plays a crucial role in assisting the protagonist, Benjamin Franklin Gates, in his quest to uncover hidden treasures and historical secrets. In the films, Abigail is depicted as intelligent, resourceful, and determined. Her knowledge of historical artifacts and her ability to think critically help the team navigate various challenges. Throughout the series, she develops a romantic relationship with Benjamin, adding a personal dimension to the adventure.