Captain's Log, Stardate 4181.4
We are at war with the Klingon Empire.
Launching an unprovoked attack upon the Federation, the Klingons have broken the terms of the Organian Peace Treaty - leaving the Enterprise stranded deep in uncharted space, cut off from the rest of the Federation fleet.
To find out what happened to the Organians, Commander Scott rigged an experimental modification of our transportation system designed to enable a tachyon replica of Mr. Spock to travel faster-than-light to Organia. But the experiment failed, and incredibly, left us with two identical Spocks: one of whom is a replica in every way the opposite of our first officer, a traitor whose continued existence poses a grave threat to the Enterprise and quite possibly the entire Federation.
One of the Spocks must die. But which one...