Shades of Gray (Episode)

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Shades of Gray
"Shades of Gray" (TNG148)

"Shades of Gray" (TNG148)
Series Star Trek: The Next Generation
Season 2
Episode 22
Production Number 148


Previous Peak Performance (TNG147)
Next The Ensigns of Command (TNG149)
Released 17 Jul 1989
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Prime Timeline
(The root of all realities)


Stardate 42976.1: An alien organism infects Riker's brain

A painful thorn in the leg snagged during a planetary survey turns deadly for Riker when it is found to carry an organism that attacks his central nervous system. When Riker falls into a coma and his vital signs plummet, Dr. Pulaski realizes that the invading microbe cannot be separated from the nerves it has wound itself around. The Chief Medical Officer is finally able to stabilize its spread, but not until it has actually reached Riker's brain. In a desperate move, she uses a tearful Troi's help in electrically stimulating his brain to help fight off the growth.

When Troi senses that Riker's romantic dreams promote the microbe's growth, she and Pulaski begin trying to stimulate his negative memories, including recalling Tasha Yar's death, to slow the organism. Pulaski finally decides to risk the potentially fatal induction of his most primitive emotions; after his body is racked with convulsions, the organism is eradicated.

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