After the crew of the Enterprise find an unstoppable force of terror from within their own organization, Captain Kirk leads a manhunt to a war-zone world to capture a one-man weapon of mass destruction.

Karl Hochman is a technician in a computer store. He is also known as the "Address Book Killer" due to his habit of stealing people's address books and proceeding to murder anyone listed in the book. Terry Munroe and her son Josh come into the store to purchase software, and a salesman uses Terry's address book to demonstrate a handheld scanner. Karl obtains the book, and while driving to Terry's house that night in a thunderstorm, his car runs off the road and lands upside down in a cemetery. While Karl is undergoing an MRI at a hospital, a surge of lightning courses through the building, and Karl's mind is transformed into electrical energy. Karl uses the electrical grid and computer networks to continue his killing spree. It is up to Terry, Josh, and computer hacker Bram Walker to stop him before it is too late.