In a city Cell just got done killing the whole city. Nero appears next to Cell and kicks him. The kick sends Cell flying off into a mountain a few miles away. Cell gets out of the hole he made in the mountain and spits out blood. "Who are you?" Cell says confused.
Nero looks at him and laughs. "I'm Nero the King of the Gods." Cell scoffs and sends Ki blast at Nero. Nero deflects them all and Cell fires off a "Kamehameha" at Nero. Nero kicks the blast up into the sky and waits for Cell's next move.
Cell frowns and yells, "If I we're in my perfect form you wouldn't be smiling!" Nero laughs and says, "Then go and become your perfect form so I can show you how weak you are." Cell flew away and went to look for 17 and 18. After awhile he found 17 fighting Piccolo and noticed 17 only had one arm. Cell looked around and saw 18 resting under a tree.
He waited until they both were distracted and went in fast to absorb 17. Piccolo and 18 were stunned and shocked at what just happened. Cell became his bulky imperfect form and smiled at 18. "Just need you and I'll have my perfect form. So let me absorb you like a good girl 18."
18 made a disgusted face and prepared to fight but Piccolo got in between them and told her to run. Cell watched as 18 flew away and frowned. He turned to Piccolo and glared at him. "Move or you die Namekian." Piccolo dashed towards Cell and they clash.
After awhile Gohan appears and uses "Solar Flare" to save Piccolo from dying. Vegeta shows up and fight Cell but after awhile he lets Cell go in order to achieve his perfect form. Krillin does what he did in the anime and 18 gets absorbed which lets Cell achieve his perfect form. He then sets up his tournament. Everyone spends time training in the hyperbolic time chamber.
Nero goes in with Bulma and tells Drake to train with Vegeta. While Nero is with Bulma he gives her the most intense training she has ever gotten letting her get up to Legendary Super Saiyan 2 and Super Saiyan 3. After each training sessions they did a different kind of exercise. Nero also showed her how to reach Super Saiyan 4 and Super Saiyan God. For her to achieve these form Nero showed no pity he went into his King of Gods form and had a "Spar" each day with her.
Bulma saw that he wasn't going easy on her so she keep fighting and improving until she finally achieved those forms. When Nero and Bulma came out no one could sense Bulma's Ki anymore except for Nero and Drake. What they did notice was that Bulma's stomach was bigger than when she went in. Goku went up to her and said, "Bulma what did you eat to get so fat? Was it good?"
Bulma had a tick mark on her head and punched Goku in the face. "I'm not fat Goku! I'm pregnant!" Goku smiled and rubbed the back of his head. Nero laughed at what they were doing.