Joe MacMillan is a fictional character from the television series Halt and Catch Fire, which aired from 2014 to 2017. He is portrayed by actor Lee Pace and serves as one of the main protagonists. Joe is a charismatic and ambitious entrepreneur who seeks to revolutionize the computer industry during the 1980s tech boom. Throughout the series, Joe's complex personality and relentless drive lead him to create innovative products and navigate the challenges of the emerging tech landscape. His relationships with other characters, including Cameron Howe and Gordon Clark, highlight themes of ambition, loyalty, and the personal costs of success.