The Pralor were a race from the Pralor homeworld in the Delta Quadrant. They had advanced technology, and built starships.

At some point they were at war with the Cravic. The two sides constructed Automated Personnel Units to help fight the war. Some time later, truce and peace was declared between the Pralor and Cravic, and the two sides agreed to dismantle the units, which were constructed only to fight this war. The Automated Personnel Units (such as 3947), however, could not accept this threat to their survival and turned on their builders, wiping out the entire race – the Cravic counterparts did the same. Both sets of robots continued to fight the war at least up to 2372, when the crew of the USS Voyager encountered them. (VOY: "Prototype")

This species was only mentioned in dialogue.
The fact that Unit 3947 said it was activated by a builder 1,314,807 hours (and 33 minutes) ago would seem to suggest that they and their war were active as of some 150 years before 2372, or circa 2222.


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