While very little is known of Juukyuu-Gou's origin, he arrived in the "normal" Dragonball Z timeline along with Nijuu-Gou. The Z Warriors believed Juukyuu-Gou and Nijuu-Gou to be the two cyborgs mirai-Trunks had warned them of. In fact, however, they were not. When Gokou suffered his fore-seen heart attack, Yamcha was forced to carry him back to his home, to give him the medicine that mirai-Trunks had brought.
Vejiita stayed behind and showed Nijuu-Gou that he too was Super Saiyajin like Gokou. Juukyuu-Gou fought against Vejiita. The two cyborgs main goal was to drain their opponents of their energy. They accomplished this by draining the chi through the jewels inbedded in their palms. When Juukyuu-Gou told Vejiita he would grab on to him, and never let go until Vejiita's chi was all drained, Vejiita used it to his advantage.
Juukyuu-Gou grabbed onto Vejiita's wrists and began sucking his chi. Vejiita, however, kicked up, planted his feet on Juukyuu-Gou's chest, and pulled away so much that he ripped Juukyuu-Gou's hands off his arms. Without his hands, Juukyuu-Gou could do very little damage and possed less of a threat. Vejiita proceed to behead him, and move on to fight Nijuu-Gou.
Juukyuu-Gou's final scene is when mirai-Trunks arrives back in the "normal" Dragonball Z world to see and help against this times cyborgs. Trunks arrived at the battle ground and Juukyuu-Gou's head lying by the crater he'd been killed in. Trunks realized then, that the Z Warriors somehow were fighting against the wrong cyborgs, and not against myself or Juunana-Gou. He stepped on Juukyuu-Gou's head until it shattered, and then took off in search of the rest of the Z Warriors.
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