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Series: 'The Original Series'
Episode Title: 'Obsession'
Episode Number: 218
Synopsis: "Kirk meets up with a gaseous being that feeds on human blood cells, which he failed to destroy during an encounter years earlier, costing the life of his captain. Now, with that captain's son on the Enterprise, he becomes obsessed with the creature's destruction."

Original Airdate: December 15, 1967


Written By: Art Wallace
Directed By: Ralph Serensky

Guest Stars:



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