When the crew finds a deactivated humanoid robot with an unfamiliar power source floating in space, Chief Engineer B'Elanna Torres is able to repair this mysterious mechanical "man." When it comes to life, the sentient artificial lifeform, Automated Unit 3947, explains that its kind is near extinction and asks Torres to build a prototype power source for construction of more units. In accordance with the Prime Directive, Janeway forces Torres to decline the request. When 3947's Pralor homeship is located, the robot abducts her and threatens to destroy Voyager unless she constructs the prototype. Suddenly, a second alien vessel manned by nearly identical robots appears and begins attacking Voyager....

Rick Worthy (Automated Unit 3947)
Hugh Hodgin (Automated Unit 6263/Prototype Unit 0001)

• The power source for each unit is slightly different and the robots are unable to duplicate them.
  
• The units were built by the Pralor and Cravic for use as soldiers. When the Pralor and Cravic finally negotiated peace, the units killed them.