Encountered by USS Voyager in the year 2372, this vessel was originally built by the Cravic. The Cravic were at war with the Pralor some time ago; both sides built large numbers of robots called Automated Units in order to do the fighting. When the two sides called a truce, they both decided to dismantle their robot armed forces. The Automated Units decided that their own builders had become a threat, and so turned on and destroyed them. The robots then continued the war between themselves according to their original programming.

The builders had anticipated the danger their creations posed, and as a result they designed each unit to be powered by an energy source which had a unique code built in. Since the robots were not able to do more than reproduce existing power sources, they were unable to replace themselves or expand their numbers. While this did not save the Pralor or Cravic, it did ensure that the robots would be unable to increase their strength significantly afterwards and pose a threat to other powers in the region.

When Voyager encountered a damaged Pralor Unit floating in space, they were able to repair and reactivate it. The unit subsequently abducted Voyagers chief engineer after a Pralor warship arrived, in an attempt to force her to create a general purpose power unit. Voyager was able to rescue Torres when a Cravic ship attacked the Pralor vessel. The Pralor and Cravic vessels appear largely identical in design.

Little is known about the capabilities of either the Pralor or Kravic vessels, and since Voyager is now far beyond their space it is unlikely that these ships will be encountered again.