Future Dr. Gero, or Future Android 20, is the alternate timeline counterpart of Dr. Gero.
Future Trunks Timeline
In some flashbacks of Future Trunks' timeline, Dr. Gero is seen as a Human after the Red Ribbon Army was defeated by Future Goku, having not made himself into an android. Later in this timeline, Future Dr. Gero (in his Android 20 form) is destroyed sometime after he activates Android 18 and Android 17; Future Android 18 distracts Dr. Gero by knocking over some equipment and 17 cuts his head off. As he warns them about Cell absorbing them, 18 blows up his head. When he is killed, the Super Computer he made to finish Future Cell is already working, so it continues and eventually finishes its work.
Video game appearance
- Dragon Ball Z: Supersonic Warriors 2