Vegeta and Goku trained in an area far away from people to prevent a stray blast for killing of any innocent people. The training they went through day after day was extreme. They had to keep it up or they would become weak, which wasn't something Vegeta had on his mind. The two Saiyans were fighting at Super Saiyan 4. All of a sudden something started to snap inside of Goku.
" Ahhh! Something is attacking me." Goku screamed.
" What are you talking about? Hey, are you trying to make me sound stupid? Well let me tell you something Kakarot that isn't going to work. I am still going to pound you into a pulp." Vegeta laughed.
" No Vegeta! I'm being serious! Something is trying to get out." Goku was in such pain. Vegeta turned around and noticed.
" No it can't be." He paused for a moment and then remembered that Kakarot had lost himself when he was an infant. " Kakarot fight it! I know what that is.. just trust me on this one."
But it was too late. Goku wasn't Goku anymore. He was now Kakarot.
" Ah the air is so fresh. I have missed it for so long." Kakarot laughed. He turned to see Vegeta flying next to him. " Ah Prince Vegeta. It's nice to see you again."
" Where is Goku?" He asked. Vegeta was worried for the Goku's life for the first time.
" Goku you ask? He is no longer here. The fool that tried to keep me locked up inside of him is gone forever." Kakarot laughed evilly.
" Why do you care sire. He wasn't a true Saiyan. I am. I will extinguish the life on this planet and then we will move on. This planet is as good as dead."
Vegeta knew there would be a slim chance to get Goku back so he did the only thing he could think of doing. He sneaked up behind him and knocked him out. " Sorry about that Kakarot." Faster then you could blink and eye Vegeta disappeared. He arrived at his house and rushed in.
" Vegeta what happened!" Bulma asked panicky.
" I'll explain later." He walked over to the couch and set Goku down. Raditz and the other Saiyans were curious what was going on.
" Ok sire what just happened. You left like a hour ago and then you come back with Kakarot like this?" Raditz stated. He wasn't the only person in the room that thought that this was strange.
" I know this will sound a little strange but we have a major problem. How to say this.. well the one known as Goku is disappearing. The real Kakarot is trying to come back."
" WOAH! Wait one minute. So Vegeta what your saying is that Goku is dying? I don't get it. What are you talking about? I mean what REAL Kakarot are you talking about?" Bulma asked.
" I think before I explain any farther we should have Kakarot's brats come over. I believe they might want to hear this too." Vegeta suggested.
" I'll go call them right now." Bulma quickly went into the kitchen and called the Son house.
ring, ring " Hello the son residence Chi-chi speaking."
" Hey Chi-chi. Can you get Gohan for me? It's really important."
" Sure." She puts down the phone and starts yelling " GOHAN. TELOPHONE CALL. FOR YOU!"
" Geez mom anymore yelling like that and I'm going to go deaf. Who is it?"
" It's Bulma. She said it was important." Gohan picked up the phone.
" Hello Bulma. So what's going on? What's do important that you needed to talk to me?"
" Vegeta just got back with your father and…"
" Hey that great!" Gohan said.
" What's great?" Chi-chi asked.
" Vegeta just got back with dad."
" Finally. I sware when he gets home I'm going kill him."
"WOAH. Just a minute Gohan. There's more." Bulma's voice came from the phone.
" What?"
" We all just found out that some things wrong with him. Vegeta didn't get around to explaining yet. He wanted me to let you know so you can come over and hear about this. I have a feeling that Goku is dying, Gohan."
" That can't be." Gohan was on the verge of tears.
" What's the matter Gohan?" his mother asked trying to comfort him.
" They think dad's dying."
" No my sweet Goku. This can't be happening!" Chi-chi screamed over the phone.
Bulma now had an earache. " Chi-chi, why don't you and the boys come over here and you will hear the whole story."
" Fine, well be right there." Chi-chi hung up.
" Oh boy. this is going to be scary." Bulma said as she was coming back from the kitchen.
" So what did the brat have to say?" Vegeta asked.
" Chi-chi said they were going to be right over." Bulma sighed.
" Wait Chi-chi said!"
" Ya she heard. She's coming too." Bulma was a nervous wreck.
" I think it's only fair." The wind kicked up as Gohan, Goten and Chi-chi came rushing in. Chi-chi ran over to her husband and started to cry. Gohan and Goten sat down near Vegeta to listen to his explaining.
" As I was about to say. Goku is having an inner struggle between the one known as Goku and the real Kakarot. Kakarot wants to be freed from Goku's control to do what he was meant to do, destroy the Earth."
Gohan and Goten were in utter shock. " Is there a way of preventing it?" Goten asked.
" Afraid not. If there was I would be getting to work on it as we speak."
" Hold on Vegeta. I have a question. Why now? I mean this Kakarot person could have come out at any time so why now?" Gohan asked.
" Well kid I can't be too sure about why he choose this time to surface but I do believe it had something to do with your father's power level."
" Father's power level? What's that got to do with it." Gohan didn't understand.
" As you should know Gohan all Saiyans have to ability to transform into giant apes at the nights of a full moon. I believe that is when Kakarot is the most risk of changing into the real Kakarot. His mind isn't as strong when he is in his ssj4 stage. That form alters ones judgement and that is one reason he chooses this time to surface."
" Hold up. So your saying that Goku is changing into Kakarot? The one we thought he was going to be." Turles questioned.
" Afraid so. He will continue to attack Goku until he is no more." Vegeta turns to Gohan and Goten. " I'd say my good-byes if I were you."