The commander of a ship of Pralor automated personnel units, who kidnaps B'Elanna Torres to make her build a prototype for new robots.
Automated Unit 6263 is a sentient robot built by the long-dead Pralor to fight their war against the Cravic. It appears in the second-season Voyager episode Prototype.
The Pralor units are wearing out and cannot make more of themselves. After Torres repairs unit 3947, which Voyager has found adrift, the robots ask her to build a new power module. When Captain Janeway refuses on Prime Directive grounds, 6263's ship attacks Voyager and Torres is taken to work under threat.
She succeeds, then learns that the robots wiped out their makers when peace was declared and that the war with the Cravic units is still going on. She destroys the prototype and is beamed out during a battle.