Stardate 5725.3: A strange energy storm first attacks the ship, then alters course and kills the personnel of the databank of Memory Alpha. Lt. Mira Romaine, Scotty's love interest, who inexplicably passed out during the first attack, predicts the return of the phenomenon before the Enterprise's sensors are able to locate it. McCoy and Spock's investigation comes to the result that the storm consists of ten distinct lifeforms, who are seeking to occupy Mira Romaine's body that they deem most compatible. The storm eventually penetrates the ship's shields and the aliens, survivors of the dead planet of Zetar, take possession of Mira Romaine. She is taken into a pressure chamber, creating a condition that kills the aliens.

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