Star Trek: The Next Generation, season 1, episode 13
Datalore
Summary
The Enterprise crew finds a disassembled android identical to Data at the site of the Omicron Theta colony—where Data was found—which was destroyed by a life form dubbed "the Crystalline Entity." The reassembled android, Lore, brings the Crystalline Entity to the Enterprise.
Summary from Wikipedia, CC BY-SA 4.0.
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