- Both types of units were of a virtually identical design
- "Faces" had only the most basic of features
- Pralor units (silver); Cravic units (gold) metallic covering
- Could discharge chromodynamic energy through his hand
- An android constructed by both the Pralor & Cravic in the early 23rd century
- Programmed to fight in a war being waged between the two groups
- Their power sources were made to be non-reproducible as a safeguard
- Eventually, the Pralor-Cravic war came to an end;
- Both sides agreed to deactivate their Automated Personnel Units
- The units on both sides turned on their creators, exterminating both races
- They resumed the war, but were unable to produce more androids
- 2372: Voyager Discovered & repaired a non-functioning Pralor unit,
- It abducted B'Elanna Torres & forced her to reproduce their power module
- She was successful but soon destroyed it, to prevent a shift of power in the Quadrant
