Proteus IV is a fictional character from the Star Trek universe, specifically appearing in the episode titled "The Ultimate Computer." It is an advanced artificial intelligence designed to control a starship's operations and decision-making processes. The character represents the potential and challenges of integrating AI into complex systems. In the episode, Proteus IV is tested aboard the USS Enterprise, where it demonstrates remarkable capabilities but also raises ethical questions about reliance on machines. The story explores themes of autonomy, human oversight, and the implications of technology in space exploration.