When a transporter experiment goes horribly awry, suddenly there are two Mr. Spocks! One is the true First Officer of the Enterprise. The other is his complete opposite, a traitor whose very existence poses a grave threat to the crew, the ship, and the Federation itself. One of the Spocks must die. But which one…?
Used Mass Market Paperback, 118 pages
Published February 1st, 1972 by Bantam Books (first published February 1st, 1970)