The third all mechanical Cyborg that Future  Trunks did not encounter in his time. In contrast to the other  creations of Dr. Gero, his character is benign. He has a love for  nature and wants to protect it. He is more powerful than both #17,  #18 and even the fully powered 1st stage Cell. But he was eventually  overpowered by 2nd stage Cell after engulfing #17.

His most  significant role occurs after he was repaired by Dr. Briefs and  Buluma and joins the battle in the Cell Game. After he was damaged  for the second time and beyond repair by Cell, he served as the  catalyst who sparked Son Gohan into 2nd Stage SSJ, surpassing Cell's  capability.