Agent K is a fictional character from the Men in Black franchise, portrayed by actor Tommy Lee Jones. He is a seasoned agent who works for a secret organization that monitors and regulates extraterrestrial life on Earth. Agent K is known for his stoic demeanor and extensive knowledge of alien species and technology. In the series, Agent K partners with Agent J, played by Will Smith, to protect humanity from alien threats. His character often serves as a mentor, guiding Agent J through the complexities of their work. Together, they tackle various challenges while maintaining the secrecy of their organization.