In "Training Day," Denzel Washington plays a corrupt cop, and Eva Mendes portrays his girlfriend, providing a glimpse into his personal life. Mendes' character adds emotional depth to the story, highlighting the impact of Washington's character's choices on his relationships. The film, released in 2001, features a gripping narrative, and Mendes' performance contributes to the overall tension and drama, making her a memorable part of the cast alongside Washington.