Cell was one of the creations of Dr.Gero. He was really strong and really deadly. In order for him to get to his perfect stage he had to had take power from Android 17 and Andriod 18.He thought that he was so strong that he could hold his own tournament against the Z warriors. But when he fought Goku he lost. So he got so made that he self destricted to blow up the earth butGoku teleported him to King Kais planet and he blow up Everyone including Goku,King Kai, and others. But Cell was able to come back because he can reform from a single cell. Cell also created cell jrs that were really strong but Gohan killed them all with a couple of kicks. Cell was strong but not strong enough to beat Gohan. When Gohan changed into Super Saiyan 2, he destoryed Cell with a one handed Kamehameha blast.