Shinka Sokushin Machine (進化促進マシーン, Evolution Promotion Machine) is the device created by Polidorius Hakase to create his mutant fish hybrids he called hangyojin, including Uroko and mutating April O'Neil. While it isn't quite known exactly how Uroko was developed, April was trapped in the machine and a fish was placed in a panel on the side. Polidorius Hakase no Hangyojin