Automated Personnel Unit " " The automated units were not created naturally . We were built . " " Automated Personnel Units were a type of android constructed by both the Pralor and Cravic around the early 23rd century . Programmed to fight in a war being waged between the two groups , both types of units were of a virtually identical design : humanoid in form with " faces " having only the most basic of features . The primary external difference was that the Pralor units had a silver colored metallic covering while Cravic units had gold colored ones . Pralor units included designations 3947 and 6263 while Cravic units included a designation 122 . Both Pralor and Cravic units were also designed with chromodynamic power module s – power sources intended to be non - reproducible as a safeguard against the androids becoming self - reproductive . Automated Unit 3947 displayed the ability to discharge chromodynamic energy through his hand as an offensive weapon powerful enough to at least knock two people unconscious . Eventually the Pralor - Cravic war came to an end and both sides agreed to deactivate their Automated Personnel Units . The units on both sides , sensing a threat to their existence , turned on both the Pralor and Cravic , exterminating both races , and resumed the war . In 2372 , the discovered a non - functioning Pralor unit . B ' Elanna Torres reactivated the unit , and was able to determine a means to reproduce the chromodynamic power module such that other androids could be powered . When she realized that allowing the Pralor units to procreate would vastly alter the balance of power in the conflict ( and possibly the quadrant ) , she destroyed her work and allowed the remaining automated personnel units to continue their war . ( ) Appendices . Background information . The Automated Personnel Units were created out of separate vacu - formed components that were fitted over the actors to allow them full movement and flexibility . ( " " , p . 169 ) Even though none of the units are specifically assigned a sex , their voices sound distinctly male , as they were voiced by the same two actors – namely , Rick Worthy ( who played both 3947 and 122 ) and Hugh Hodgin ( who played both 6263 and Prototype Unit 0001 ) . Ken Biller said of the challenge involved in creating the robots , " " That was an almost impossible task given what our budgetary constraints are and given the time that is alloted . We couldn ' t afford to do body makeup so suddenly he ' s in costume . " " ( " Cinefantastique " , Vol . 28 , No . 4 / 5 , p . 92 ) In a 2010 interview , Rick Worthy recalled working in the costume ; " [ It ] " was a lot of fun , but really hard too because I couldn ' t see anything inside the robot suit . They put two little slits where I could barely see out . I had to practice where my marks were on the floor and when the cameras rolled I had to force myself not to look down . When it was over I had to voice over the whole thing , because I was speaking from inside of a mask and the sound wasn ' t recorded very well . " " The small eye - holes in the robot costumes dictated the kinds of shots that " Prototype " director Jonathan Frakes could use . As Rick Worthy explained , " " Jonathan had to set up each shot in such a way that made the slits unnoticeable to viewers . " " ( " TV Zone " , issue 126 , p . 28 ) In their review of " Prototype " , authors Mark Jones and Lance Parkin refer to the Automated Personnel Units as " " stiff , inexpressive robots . " " ( " Beyond the Final Frontier " , p . 288 ) Similarly , Ken Biller was unhappy with how the costume looked ; " " The robot looked like the guy in the suit . It just looked really , really hokey and cheesy " [ . . . ] " If he is a mechanical man , why is he wearing a suit ? He looked like the tin woodsman and it was unfortunate and disappointing . " " ( " Cinefantastique " , Vol . 28 , No . 4 / 5 , p . 92 ) Apocrypha . The " " novel " Places of Exile " makes reference to the chromodynamic power module the Automated Personnel Units possessed . In an alternate timeline , Torres ' experience with them makes her perfect for a mission to a Casciron ship where she would hide aboard after disabling the Vostigye vessel , " Ryemaran " . The Automated Personnel Units appear in a Delta Quadrant patrol mission in " Star Trek Online " , in which the player becomes caught in the crossfire between the two types . An APU cruiser is also available as a playable starship .