Stardate not given: Voyager picks up a damaged robot from space. After attempting in vain to restore the robot's power system, B'Elanna comes up with the idea to use modified warp plasma as a power source. The android wakes up and identifies himself as Automated Pralor Unit 3947, apparently the survivor of a global crisis in which the humanoid inhabitants of the Pralor homeworld, the "Creators", were all killed. Janeway refuses to develop a power module that would allow to build more Pralor androids. When he is going to be returned to his people, 3947 kidnaps B'Elanna and forces her to construct a prototype with a universal power module. When the Pralor ship is attacked by a similar vessel of the Cravic, 3947 reveals that the Pralor and Cravic civilizations had both built androids to fight each other, but the androids wound up killing their creators and continued the war on their own, whereupon B'Elanna destroys the prototype. Tom takes a shuttle and can use the diversion to rescue B'Elanna.

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