A transporter malfunction caused the Vulcan first officer to be duplicated, not once, but into fifty facsimiles. Replica Spocks were marched to sickbay to see if the original Vulcan could be determined - if, in fact, he still existed.
Doctor McCoy lived his worst nightmare, wading through a sea of logic-spouting Spocks, and found yet another reason to despise the oft-malfunctioning contraption.
Fifty heads, being better than one, soon found a solution, and a solitary Vulcan greeted the doctor.
"Are you the real Spock?"
"Doctor, I am indeed the 'real McCoy'."
McCoy realised his nightmare had only just begun.