Including the No. 17 and No. 18 he had previously released once, all were retrieved for further transformation due to disobedience.
During the process of experimentation, he had to ensure these androids became as strong as possible while making them completely obey his commands, the latter requirement consuming much of his energy.
An experiment subject that doesn't obey is a complete failure, regardless of strength.
But Su Xin issued him new instructions.
No need to consider whether the experiment subjects are obedient, just focus on enhancing their strength as much as possible.
This saved him quite a bit of effort.
After all, Su Xin possessed absolute power to suppress any disobedient subjects, and for that, Su Xin even specially took Dr. Gero to the cosmic universe for a brief demonstration of his unparalleled strength.
Meanwhile.
Su Xin also provided Dr. Gero with cells from martial arts masters within the Azure Empire.
