Android 18 was created by Dr.Gero,and she is the only female android.She is the
twin sister of Android 17.When Dr.Gero was killed,she activated Android 16.16,17 and 18 flew to fing Goku,but the proud Vegeta
came to fight them.He fought against 18,and she blocked every move he did.When Vegeta lost much energy to be a super saiyan,she
kicked him,and she broke both of his arms.Trunks,Tien and Piccolo tried to help him,but 17 beated them too.The androids decide
to let them live,and they flew to find Goku.When 17 was absorbed by Cell,
16 and 18 went to an island to hide from him.Bulma invited a tool that could
destroy 18 and she gave it to Krilin.Vegeta,who finished his training,fought against Cell on the island where the androids
hide.When Krilin came,he couldn't destroy 18 because he loved her,so he broke the tool.This mistake and the pride of Vegeta,let
Cell to complete.After Gohan blowed Cell as super saiyan 2,he spit out android 18 that he absorbed.
After Cell's defeat,Krilin asked Shenron to remove android 18's
bomb which hidden in her body.In the Buu sagas he and android 18 live together
and they have a daughter named Marron.After Cell's defeat 18 became soft hearted and she doesn't interested in destruction
enymore.