An alien phenomenon of unprecedented size and power is approaching Earth, destroying everything in its path. The only starship in range is the U.S.S. Enterprise--still in drydock after a major overhaul. As Captain Decker readies his ship and his crew to face this menace, the legendary Admiral James T. Kirk arrives with orders to take command of the Enterprise and intercept the intruder. But it has been three years since Kirk last commanded the Enterprise on its historic five year mission...is he up to the task of saving the Earth?