Nijuu-Gou was once the evil Doctor Gero, but he rebuilt himself as an android. His first apperance is on an island in the city with his companion android Juukyuu-gou. These two came, and attacked and killed a few people until Yamcha encountered them. Nijuu-Gou at first mistook Yamcha for Gokou, but then realized he didn't match the data on Gokou. He held him by his throat and proceeded to drain his chi through a jewel embedded in his palm.
Once Nijuu-Gou drained Yamcha, he thrusted his arm through the Z Warriors chest, just about killing him. At that time, the rest of the Z Warriors who couldn't sense the androids because they had no chi, sensed Yamcha weaking and came to help. This was the first fight against Gokou-tachi and the androids. Nijuu-Gou spoke a little, and then wiped out over half of the large city with a sweeping chi blast.
From there, Gokou convinced both androids to fight on a surface that wasn't so heavily populated and they took off, leaving the island. Nijuu-Gou did not want to wait to fight, and finally told Gokou-tachi they'd fight right there. He gave Gokou preference of land over air to fight. Nijuu-Gou gloated over how he had studied of everyone since Vejiita's arrival until Freeza's arrival all cataloged on data in his mind.
Gokou told him he was stronger now, and Nijuu-Gou even said they calculate his age and how much he could strengthen in between the time. Gokou smirked and went Super Saiyajin, completely baffling both Nijuu-Gou and Juukyuu-Gou. Nijuu-Gou still believed himself more powerful, and fought against Gokou. Nijuu-Gou held his own against the Super Saiyajin and Gokou even seemed to be showing signs of fatigue. In fact, when Gokou fell, it seemed certain he was going to be killed when Vejiita arrived and "saved" him.
Gokou was suffering from the heart ailment the future boy had foretold. Yamcha voluenteered to take Gokou home and get the medicine. Vejiita then surprised not only Nijuu-Gou and Juukyuu-Gou, but the rest of the Z Warriors by transforming in to a Super Saiyajin himself. He was pure evil, and thus could make the transformation.
Vejiita fought against Juukyuu-Gou and beheaded him. At this point, Nijuu-Gou realized he was going to be killed, so he ran off into the mountains. Vejiita, as well as the rest of the Z Warriors, followed him, looking for him, because they couldn't sense for his chi. Nijuu-Gou saw Piccolo and intended to drain his chi. He crept up behind him, put his hand over Piccolo's mouth and wrapped his legs around him from behind and drained the Namekseijin.
Piccolo mentally felt Gohan and called him towards him. Gohan came and kicked Nijuu-Gou off of Piccolo. The rest of the Z Warriors arrived shortly after. Kuririn gave Piccolo a senzu bean to recover him from his depleted strength, and then Piccolo stopped Super Vejiita from attacking Nijuu-Gou. He shed his cape a turban and proceeded to beat Nijuu-Gou into the wall, and merciless win. Bulma and Yajirobe, along with baby-Trunks were flying by when Bulma reconized Nijuu-Gou to be Doctor Gero.
Nijuu-Gou fired at Bulma's plane and took off to escape back to his laboratory. Mirai-Trunks arrived then, in time to save Bulma and baby-Trunks. He chewed Vejiita out as he was leaving to chase after Nijuu-Gou, asking him why he didn't help his son and mother of his child. Vejiita said they weren't his concern, and blasted off after Nijuu-Gou's laboratory. The rest of the Z Warriors followed, Trunks hot on Vejiita's tail, enraged.
Nijuu-Gou arrived back at his laboratory, and released myself and my twin brother, Juunana-Gou. Shortly after, Nijuu-Gou is killed and my brother and I continue the fight in the Cyborg Saga.
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