Believing that the annihilation of one Borg-controlled ship will wipe out their menace forever, Starfleet Command sends out the Enterpriseto complete the mission -- only to discover how very wrong their calculations have been...

One lone ship, the former science vessel Einstein, has been taken over by the Borg. Cut off as it is from the rest of the Borg Collective, if the ship can be found and destroyed, the Federation can rest easy. The task becomes more urgent still with the discovery of a system-wide slipstream which could enable the Einsteinto reach the Borg Collective; or worse, give the Borg the capacity for instantaneous transportation to other parts of the galaxy. The Enterpriseis dispatched to prevent that threat -- but the Borg have evolved and are more determined than ever to conquer Earth, and with it the Federation.