Android 18 is the female half of the 17/18 Android team created by Dr. Gero. Gero created them with the intention of having Imperfect Cell absorb them to transform into a perfect android. Cell does succeed in absorbing both 17 & 18 but spits 18 back out later after getting his tail kicked by Gohan. Krillin runs to 18's rescue and pulls her out of the battle. They eventually marry and have a daughter, Maron.