Each droid resembled a mobile turret, with treaded wheels, two clawed arms, and a rotating head equipped with blaster cannons.
The Alliance managed to disable and capture one warbot, and R2-D2 attempted to analyze its design for flaws. Unfortunately, the astromech accidentally damaged the warbot beyond use. R2-D2 and C-3PO took the damaged machine to Kligson's Moon, hoping Kligson could reconstruct its blueprints.
Unfortunately, Z-X3 already had acquired a damaged warbot. By combining pieces of the two damaged warbots, he created a functioning machine, which he intended to turn against Kligson. Kligson, however, had foreseen and prepared for the mutiny, and turned the warbot against Z-X3 and its cohorts, destroying them. Kligson then returned R2-D2 and C-3PO to the Alliance with complete warbot blueprints.