Admiral Adam T. Kirk is definitely charged with the Klingon Empire for the comandeering of the Klingon starship. The Federation honors the Klingon demands for extradition, and Kirk as well as the crew from the Starship Business are drawn back again to Earth.

But their trip is interrupted by the appearance of the mysterious, all-powerful alien space probe. All of a sudden, Kirk, Spock, McCoy and the rest of the crew must trip back through time to twentieth-century Globe to resolve the mystery of the probe.