ANDROID 19
RACE:Android
STRENGTH:Weak/Strong
STATS:Android 19 is one of Dr.Gero's minor creations. 19 is not very strong and only beats Goku because of his heart disease. 19 is easily beaten by Vegeta.
ANDROID 20
RACE:Android
STRENGTH:Weak/Strong
STATS:Android 20 is no other than Dr.Gero. Dr.Gero made himself an android, but still was not strong enough to beat the Z team. 20 is killed by his own, Android 17.
CELL
RACE:Android/Mix
STRENGTH:Very Strong
STATS:Cell is Gero's greatest creation. He contains the cells of all the great warriors and villians. Cell starts in a weak form, but after sucking up 17 and 18 he becomes perfect. Goku tries to kill Cell by taking him to King Kai's planet and using a kamikaze, but Cell survives from one brain cell. Finally, after going super saiyan 2, Gohan destroys Cell with a one handed kamehamaha.