In an experiment in human/Vulcan relations, Kirk is chosen to be the first human to serve on an all-Vulcan ship. Spock is his senior officer and Kirk has difficulty in adjusting to a very different ship and crew
Spock falls victim to a psychic link and Kirk is caught up in the backlash. While Spock is catatonic in the throes of mental agony, Kirk suffers the physical fallout and McCoy fights to save them both and keep the ship in one piece