CELL SAGA
It is now 3 years after the arrival of the mysterious boy. He had told Goku that they were supposed to train for the arrival of two strong beings, androids, created by Dr. Gero. They did as the mysterious boy told them, they trained hard for three years.

They waited for the arrival of the two androids in the place that they were said to be, and there they meet Android #19 and Android #20. Android #19 is the first of a series of creations to destroy Goku. Along with the scheme, Dr. Gero requests Android #19 to make him (Dr. Gero) into a cyborg so that he would become stronger, and so Dr. Gero is transformed to Android #20.

The Z Warriors meet with Androids #19 and #20 and the two sides engage in battle. Goku leaves the battle because of his heart disease and leaves the battle to Vegeta. The android is destroyed and Dr. Gero is shattered. Despite the grave defeat, Dr. Gero's cybernetic programming enables him to self-repair, so that he may live to fight again.

Android #20 then works on developing a better android model. Meanwhile, he unleashes two of his other creations, Android #17 and Android #18. Androids #17 and #18 get annoyed of Dr. Gero. As a result, Android #17 kills Dr. Gero. But, the doctor had just finished creating Android #21, who is still developing in a giant test tube. Before he dies, he issues the final command to his new android to feast on the rebellious androids. Android #17 and Android #18 leave the lab and unleash Android #16. But as it turns out, Android #16 is a peaceful android. (This can be shown through his love towards the wild animals.)

As time passes, the Z Warriors become aware of the new androids as they battle again and again but always reach a stalemate. However, the Z Warriors are still not match for the androids because the androids are robots, and therefore do not tire in a long battle while the Z Warriors eventually run out of energy. Goku suffers a heart attack in one battle and retreats. Trunks, who was sent back in time by future Bulma with medicine to heal Goku's heart so that Goku would live to kill the androids and thus change the future, gives Goku the medicine. Goku is saved, but the Saiyans still do not continue to fight the androids. Instead, they train in a chamber to get stronger. Meanwhile, Piccolo fuses with Kami, his half father, to become stronger (His story is told in the Dragonball series.) Dende, a Namek child, replaces Kami as guardian of the dragonballs. Androids #16, #17, and #18 go to seek Goku to destroy him. Piccolo finds the androids first and begins to fight them. Back in Dr. Gero's lab, Cell has finished developing and breaks out of the giant "test tube", promising to fulfill his creator's wish.

Cell flies to find Androids #17 and #18. On his way devours the souls of the unlucky civilians he passes to become stronger. Finally, he meets with the other androids. To our heroes' surprise, they learn that Androids #17 and #18 know nothing about Cell. Cell and Android #17 threaten to kill each other. Android #17 heads out to fight him. But, he does not stand up to Cell and is easily defeated. This is when our heroes learn the great powers of Cell. Android #18 is now worried, but Android #16 flies out to fight Cell. To everybody's amazement, Android #16 is able to stand up to Cell. However, he is still destroyed. Cell now heads for his goal and devours Android #17 with his tail. Cell now changes into Cell--form 2. With the power of Android #17 combined to his, he becomes stronger than ever.

Then, he heads over to devour Android #18. Android #18 tries to escape, but she is still eventually devoured. Cell now changes into Cell form 3, and becomes "Perfect Cell" Cell, after devouring the souls of so many people, is no longer an android and becomes organic. After Cell is gone, Bulma collects the body parts of Android #16 and repairs him. Android 16 is re-programmed to fight on the Z Warriors' side.
CELL SAGA PART 2