Stardate 1704.2: While Spock and his assistant Termolen are investigating strange occurrences on an outpost on the collapsing planet Psi 2000 that have killed the complete crew, Termolen contracts an infection. This infection is not detected and spreads among the Enterprise crew through skin contact, causing their emotions to go to extremes. Termolen, who was weary of his life as a space explorer, even dies. Kevin Riley, on the other hand, becomes megalomaniac, locks himself up in the engine room and shuts down the propulsion system. Using a completely new procedure to restart the engines Spock and Scotty save the Enterprise from crashing into the planet, and the ship also travels back in time.

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