DR. GERO SPOILER!
DG
The brilliant, vengeful chief scientist of the defunct Red Ribbon Army. Driven by a lifelong hatred of Goku for destroying his military empire, Gero spent decades spying on the Z-Fighters to build the perfect mechanical assassins. To achieve immortality and survive long enough to see his revenge realized, he even transplanted his own brain into a cybernetic body, becoming Android 20. He is the ultimate catalyst for the entire Android and Cell Sagas.
DR. THROUGH THE ARCHIVE //
TECHNIQUE ENCYCLOPEDIA //
Open page →A mechanical energy extraction system built into the palm nodes of absorption-type androids. Grappling an opponent allows the palm sensors to siphon internal ki directly out of the victim's body to recharge internal mechanical batteries.