Stardate 42976.1: On an away mission on Surata IV Riker contracts an infection that will eventually reach his brain and kill him. Dr. Pulaski begins a treatment of neural stimulation in the course of which Riker experiences pleasant dreams. Deanna senses Riker's dreams while the infection is spreading even more rapidly and concludes that negative emotions might stop the growth. She and Pulaski begin stimulating negative memories such as Tasha Yar's death and other sad moments, upon which the infection is eventually slowed down and disappears.

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