Agent J is a fictional character from the Men in Black franchise, portrayed by Will Smith. He is a skilled agent working for a secret organization that monitors and regulates extraterrestrial activity on Earth. Agent J is known for his quick wit, charm, and ability to handle various alien encounters. In the series, Agent J partners with Agent K, played by Tommy Lee Jones, to protect humanity from alien threats. Together, they use advanced technology and their training to maintain peace and secrecy, ensuring that the existence of aliens remains hidden from the general public.