Stardate 2394.8: Starfleet has set up a deuterium refinery in Bannon's Nebula. Pelia and Una are overseeing the efforts to get the station operational. On the Enterprise, Ensign Uhura hears a strange noise and some time later experiences frightening visions. Dr. M'Benga ascribes this to deuterium poisoning after she has been working inside a nacelle. He tells her to rest. However, she is sure she heard the first noise sooner than that, and it is getting worse each time. In the crew lounge, Uhura meets James Kirk, first officer of the USS Farragut. Briefly later, she has another hallucination in a corridor, in the course of which she knocks down Kirk. On the station, Pelia has discovered evidence of sabotage. She and Una find the culprit: Saul Ramon, a technician who suffers from hallucinations similar to Uhura's. He is taken to sickbay, but attacks M'Benga, runs away and kills a crew member. Uhura finds him in the port nacelle control room and attempts to calm him down. But Ramon continues with his sabotage. Kirk appears and orders a beam-out in the nick of time before the control room explodes, killing Ramon. Kirk tries to calm her down, but Uhura is terrified that the same may happen to her. Then she notices that the noise may be aliens trying to communicate with her. With Sam Kirk's help, she figures out that extradimensional aliens, who attach themselves to deuterium atoms, are getting killed in the refinery. She hurries to the bridge to stop the activation of the facility, but it is too late. Moreover, it is not possible to shut it down. Uhura insists on evacuating and destroying the station, for which Pike assumes the responsibility. Her scary visions do not return. In the crew lounge, Uhura introduces her new friend Kirk to her ship's science officer, Spock.

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