The greatest creation that Dr. Gero made, cell is a combination of blood samples taken from: Goku,

Vegeta, Nappa, Piccolo, Frieza, and King Cold. Cell has three entirely different stages, the second and third stage are reached by absorbing certain Androids. The Androids are 17 and 18. When he

finally obtains them, he becomes incredibly powerful and organizes the cell game. Cell is finally

killed on May 26th, 767 AD by Super Saiyan Gohan with help from the Z fighters.