Stardate 47225.7: Data is troubled by nightmares from his dreaming program, including a "cellular peptide cake" in the shape of Deanna Troi and workmen apparently disrupting a plasma conduit. In the meantime, Geordi attempts in vain to activate the new warp core. When Data begins to see strange mouth images on his crewmates and finally stabs Deanna into the shoulder, he is confined to quarters. Beverly, examining Deanna, finds an interphasic creature just where the wound is located. These lifeforms are extracting cellular peptides from their victims and have also disabled the warp drive. With the help of Data's dreams, which symbolize the effects of the alien attack, Picard and Geordi devise a high-frequency interphasic pulse to expel the creatures.

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