Season 3/4: The Best of Both Worlds (Parts 1 and 2)

Locutus:"I am Locutus...of Borg. Resistance...is futile. Your life, as it has been...is over. From this time forward...you will service...us."

Riker: "Mr. Worf...fire."

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Star Trek's first season ending cliffhanger, these are the episodes that brought the show out of the shadow of The Original Series. One of the best Next Generation episodes, and possibly one of Star Trek's very best.