Stardate 2398.3: The Enterprise investigates a naturally occurring subspace fold. Spock, Uhura and Pelia try to utilize the anomaly for faster communication. When they send a message in the form of a song into the subspace fold, they inadvertently trigger the creation of a quantum uncertainty field that makes the crew sing. La'an rates the fact that everyone openly expresses their emotions as a security risk. She herself is struggling whether to tell James Kirk, who happens to be aboard too, of her feelings for him. An attempt to collapse the field using the deflector dish fails and causes the phenomenon to spread to other Federation ships and eventually to the Klingons. Spock tests a new method to destroy the field on a small sample but comes to the conclusion that it would unleash a huge destructive force. As the Klingons are on their way to blow up the phenomenon with disruptors and torpedoes, time is pressing to find another way to eliminate it. La'an talks to Kirk about their previous encounter in another timeline, only to learn that he is in a relationship. Spock is depressed because Christine Chapel didn't tell him she was accepted for a fellowship with famous archeologist Dr. Korby. He leaves Uhura alone with the task to detect a pattern in the data about the subspace fold. The ensign finds out that the field spikes each time someone sings and that it could be collapsed in what she calls a grand finale, and so the whole crew starts to sing at once. Right in time before the Klingons can target it, the phenomenon is gone and everyone is back to normal.

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