She, along with her brother 17, were meant to be absorbed by Gero's masterpiece Cell. Unfortunately for her, she played a secondary role in Gero's plans. 18 is a powerful fighter who is as beautiful as she is deadly, capable of treating the Saiyan Prince Vegeta as a plaything during battle. In Dragon Ball Z he created 18 as a tool to extract his vengeance.
Gero for the sole purpose of killing Goku, as he held a grudge against Goku since Dragon Ball. Android 18 was created by the nefarious Dr.