Explaining errors in Star Trek Wiki
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Summary

When Data experiences his first emotion, anger, after an encounter with the Borg, Data tries hard to recreate the experience, and he is blind as to what the consequences will be. Meanwhile, the rest of the Enterprise investigate the mystery as to why the Borg they faced seemed to have names and feelings of their own, leading them to a reunion with Data's evil twin Lore. Before Lore can run risky experiments on Geordi, Troi and Picard, the three seek a way to re-boot Data's ethical program that Lore switched off to pull Data to his side.