Eddie Morra is the main character in the movie Limitless, portrayed by actor Bradley Cooper. He is a struggling writer who discovers a mysterious drug called NZT-48 that enhances his cognitive abilities, allowing him to access his brain's full potential. This newfound intelligence leads him to success in his career and personal life. As Eddie becomes more reliant on NZT-48, he faces various challenges, including dangerous consequences and the attention of powerful individuals. His journey explores themes of ambition, addiction, and the ethical implications of using such a drug to enhance human capabilities.