After stopping off at Starbase Yorktown, a remote outpost on the fringes of Federation space, the USS Enterprise, halfway into their five-year mission, is destroyed by an unstoppable wave of unknown aliens. With the crew stranded on an unknown planet and with no apparent means of rescue, they find themselves fighting against a ruthless enemy with a well-earned hatred of the Federation and everything it stands for. Only a rebellious alien warrior can help them reunite and leave the planet to stop this deadly menace from beginning a possible galactic war.