Droid Tank One, a war droid, chases R2 and 3PO to a melting core shaft on Kligson's Moon. The story flashbacks to Luke and the droids using a Blockade Runner to meet another Rebel ship. Its captain shows Luke an Imperial warbot captured on Xeron. The droids study its schematics, but R2's probes make its innards fuse, so they are sent to Kligson's Moon (Droid World), to find Captain Kligson, a reclusive mechanical genius who built the moon from space salvage and works only with robots. As they approach, he opens fire and says to leave; injuries in the Clone Wars left him a Borg, hostile to organics. Finally, he agrees to fix it if he can keep it. Luke must stay off-moon, but the droids can record his work. A tractor drone brings him the warbot, which he deems poor handiwork. He introduces Z-X3, a salvaged Stormtrooper-like droid discarded by Tagge Industries. He tells Z-X3 to dump the warbot in the core and remove the droids' restraining bolts so they can join his world. Surprised when they decline, he tells Z-X3 to bring them to him. Z-X3 does so then leaves for the melting core, but R2 follows, suspicious at sensing no heat, and finds work drones removing the 'bot's weapon-head to attach to another warbot and planning a coup. Detecting R2, a war droid opens fire, but R2 escapes. As Kligson and 3PO debate the worth of organics, R2 rushes to expose the revolution, but Z-X3 enters and kills Kligson, claiming Droid World for the Empire. R2 and 3PO flee to the melting core, pursued by the warbot and Droid Tank One. As the droids rush them, R2 pulls 3PO over the edge. Magnetic grapples catch them but the war droid falls into the core. Kligson saved them, as he suspected Z-X3's duplicity, built an android of himself, and used R2 and 3PO as catalysts to expose Z-X3. He needed the warbot's parts to fix his own warbot, which he now uses to destroy all the mutinous droids. As he grieves the deaths, R2 and 3PO return to Luke with the schematics. Luke worries that the Empire will take Droid World, but Kligson moves his moon away from known space to truly live in solitude.

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