Andriod Eighteen was originally created by Dr. Gero to find and kill Goku along with Andriod Sixteen and Seventeen. However, before she and her trio of androids could cause any permanent damage, they were absorbed into Cell, thus making him complete. Later on, Eighteen was spit up by Cell and rescued by Krillin, who was quite taken with her. Much later she marries Krillin and they have a daughter named Marron. This is when we find out that Eighteen had originally started out as a human girl, but was turned into a bio-android by Gero. She is most likely the strongest woman on the planet, and was almost the first female world champion had it not been for her greed.
