While mapping a series of gravitational anomalies, the Enterprise is suddenly hurled millions of light-years through space, into a distant galaxy of scorched and lifeless worlds and into the middle of an endless interstellar war. With no way back home, the crippled starship finds itself under relentless and suicidal attack by both warring fleets!
Starfleet orders the Enterprise to moderate a dispute between two worlds. On arrival, Kirk sends Spock and McCoy to investigate the rebel's claims. But seconds after beaming down, the two officers are taken hostage and then - according to sensors - killed. Devastated by his loss, Kirk must try to learn the truth behind the mysterious rebellion that has claimed the lives of his two closest friends.
The sole survivor of the destruction of the U.S.S. Jenolen, engineer Montgomery Scott is revived seventy-five years later aboard a later model of the Enterprise and journeys back in time to prevent the death of James T. Kirk, an effort that has unexpected repercussions, when he, Kirk, and the crew of the Enterprise are trapped in an altered reality.