A transporter accident swaps Kirk and three crewmates with their savage counterparts from a parallel universe ruled by a brutal Terran Empire, and Kirk must survive among the mirror Enterprise's assassins and schemers long enough to engineer his way home.
Summary by Loreful, from public sources
Placement
- Star Trek Original TV Series Adaptations
- contained in Star Trek 3collection
- contained in The Classic Episodes 2collection
- contained in The Star Trek Readeromnibus