If Kakarotto had never hit his head...

[Kroni_Hunter]

What would have happened? Earth would have been a goner, and Kakarotto would have probably partnered up with the other Saiyans...but how powerful would he have become and what would have happened to the Freeza/Cold empire?

[Piccolo Daimao]

Basically, Goku would've looked like Tullece (since that's what Tullece was supposed to be; a representation of what Goku would've been like if he hadn't hit his head), destroyed Earth and joined up with the Saiyans to continue conquering planets. He'd probably remain weaker than Raditz, not getting the special training on Earth and in the afterlife. But if any of them were beginning to grow too strong, Freeza would've just killed them.

[Herms]

I kind of question whether he would have really been able to wipe out everyone on Earth. If he kept on rampaging, you'd think Gohan, Kame-sennin, or God would eventually manage to defeat him before he got too powerful. God knew about Goku's tail and its connection to his Oozaru form, so it seems he'd been watching Goku for some time even before he defeated Piccolo, probably because he knew the danger Oozaru Goku posed to Earth. So even if alternate universe Goku went around rampaging as an Oozaru, God would probably manage to cut off his tail and wouldn't have much trouble with him after that. I mean, if even Yamcha and Puar managed to take down Oozaru Goku once they knew what to do, I think his potential as an Earth-conquering monster is rather limited.

[Piccolo Daimao]

I kind of question whether he would have really been able to wipe out everyone on Earth. If he kept on rampaging, you'd think Gohan, Kame-sennin, or God would eventually manage to defeat him before he got too powerful.

Oh yeah, I forgot about that. Didn't Raditz say Goku should've destroyed Earth over a course of years or something? Even so, at Ozaru, God should've been able to kill him in an instant.

[Kroni_Hunter]

I kind of question whether he would have really been able to wipe out everyone on Earth. If he kept on rampaging, you'd think Gohan, Kame-sennin, or God would eventually manage to defeat him before he got too powerful.

Yeah I bet one of them would have realized the connection between Oozaru and the full moon and would have destroyed it, leaving Goku pretty powerless by comparison. Even Roshi/Tenshinhan would have been more than a match for him without training, so I doubt Kami would even get involved. Goku might be lucky and survive long enough for Raditz to show up though, assuming Piccolo hadn't completely destroyed it.

[SSJGoku93]

He most likely would of eventually transformed, and leveled most of Earth. However, I always wondered, would Master Roshi have been able to halt Goku's onslaught? He stops his rampage at the World Tournament, but he knew how to handle it in that case. Perhaps God and Mr. Popo could of stopped Goku, or maybe Tenshinhan? Let's say Goku was not stopped, he would of destroyed most of Earth's civilizations. Eventually, Raditz would of come to take his brother, and they would of probably joined up with Vegeta and Nappa, continuing to conquer planets for Freeza and his empire for many years. It is to hard to tell how powerful he would of become, but I doubt much higher then a power level of a few thousand. With no one stopping Freeza, I'd imagine he would go uncontested for many, many years.

On Earth, none of Goku's heirs would exist obviously, and most of the main characters would of most likely been killed. King Piccolo would of remained sealed forever, Namek probably would of remained untouched, as Freeza would not known of the Dragon Balls, unless he would of invaded just to have the planet himself. Obviously Dr. Gero would of most likely died too, thus no Cyborgs/Cell etc. Babidi would not of found enough energy on Earth to revive Majin Buu, so it is to hard to guess what would of become of those two. Perhaps, he and Dabura would destroy Freeza's empire, and use the energy of those warriors to revive Buu? Perhaps, Goku and the others would of been easily killed by Dabura or Buu? If you want to throw movie timelines in here, the possibilities are endless; same for GT.

[Herms]

Oh yeah, I forgot about that. Didn't Raditz say Goku should've destroyed Earth over a course of years or something? Even so, at Ozaru, God should've been able to kill him in an instant.

Yeah, Raditz says that since Earth has a moon, if Goku had remembered his orders he should have been perfectly able to wipe out all resistance in a few years. Presumably he assumed that nobody on Earth would be able to work out that Goku needed the moon and/or his tail to maintain his Oozaru form. Which is probably a reasonable assumption unless a) Goku happened to be adopted and raised by someone strong enough to survive an initial encounter with his Oozaru form b) Goku didn't hit his head and become an idiot who tells his weakness to random people c) there isn't someone who watches over everything that happens on Earth. Heck, even assuming everything went according to plan, surely if Goku were going around conquering the Earth over several years, people would eventually work out that the big killer monkey only comes around during the full moon, and if Kame-sennin or other like him were still alive by that point they might be able to use that information.

Anyway, this makes me wonder how much the Saiyans knew about Earth. Raditz calls Earth a low-level planet without significant opponents, but people like God or Popo, or even relative weaklings like Kame-sennin or Tsuru-sennin would be able to give a young, untrained Oozaru Goku a run for his money. Did the Saiyans just not know about them? They were presumably sending out lots of people to different planets, so maybe they didn't have the resources to investigate them all too carefully. It's not like if Goku was sent off and got killed by tougher than expected opposition that this would be any great loss as far as the Saiyans or Freeza's army as a whole were concerned. And it's also more than possible that whatever scouter or scouter-like thing they used to check out the strength of the Earthlings wouldn't accurately measure the power of God or Popo, since they can completely suppress their energy, and even guys like Kame-sennin might register far lower battle powers than their maximum if they were just hanging around at the time.

[Kroni_Hunter]

If you think about it destroying Earth would be the stupidest thing the Saiyans could do, since that's where the gravity machines/sensu beans/ dragon balls come from.

Maybe Goku bides his time and somewhere along the line hears about Karin tower. Then when Raditz arrives he tells him about the sensu beans and the two of them proceed to give each other near death power ups and become the strongest beings in the universe. (They'd have tons of beans since Yajirobe would not have eaten them all)

[Piccolo Daimao]

@Herms: I think they just didn't care. They probably passed off Earth as a low-level planet with low-level inhabitants, and didn't bother to check for the anomalies like Kame-sennin or God. I mean, yeah, they probably would've clocked on that the Ozaru comes once every full moon, but I think the Saiyans, seeing Earth as a low-level backwater planet, probably saw the inhabitants as having equally low intelligence. Vegeta does contemptuously say to Gohan that he didn't think Earthlings were smart enough to venture into outer space. Something like that, "Heh...Earthlings...just smart enough to make their way into outer space, but not smart enough to make a watch any smaller than that."

And you're right, even if Goku was killed, it wouldn't be a great loss. It's just one less Saiyan, and at that, a Saiyan that was considered trash, even by low-class weakling Raditz.

[Ringworm128]

One thing Iv always wondered is how would Goku have known what to do when he got to Earth he was a new born when he was sent to Earth so how could he remember his orders? Are Saiyan meant to have super good memories or something? Or does Freezas army program the infants mind like a computer or something?

[Kiyza]

One thing Iv always wondered is how would Goku have known what to do when he got to Earth he was a new born when he was sent to Earth so how could he remember his orders? Are Saiyan meant to have super good memories or something? Or does Freezas army program the infants mind like a computer or something?

Considering they're Saiyans, I'd assume they really wouldn't need orders to go on a rampage and destroy things.

[Ringworm128]

One thing Iv always wondered is how would Goku have known what to do when he got to Earth he was a new born when he was sent to Earth so how could he remember his orders? Are Saiyan meant to have super good memories or something? Or does Freezas army program the infants mind like a computer or something?

Considering they're Saiyans, I'd assume they really wouldn't need orders to go on a rampage and destroy things.

Well if thats the case why didn't Tarble destroy his planet?

[Kiyza]

One thing Iv always wondered is how would Goku have known what to do when he got to Earth he was a new born when he was sent to Earth so how could he remember his orders? Are Saiyan meant to have super good memories or something? Or does Freezas army program the infants mind like a computer or something?

Considering they're Saiyans, I'd assume they really wouldn't need orders to go on a rampage and destroy things.

Well if thats the case why didn't Tarble destroy his planet?

It was mentioned in the JSAT special that he was weak and didn't have the typical personality traits of a Saiyan. He's an anomaly, really.

[Bando]

God knew about Goku's tail and its connection to his Oozaru form, so it seems he'd been watching Goku for some time even before he defeated Piccolo, probably because he knew the danger Oozaru Goku posed to Earth.

Are you sure? In the anime Goku had this to say:

Yamcha: Goku! Your tail... !
Goku: Kami-sama took it off. I don't really know what he meant, but he said that my tail was a real problem ever since he brought the moon back after it disappeared.

[the_abberration]

Quite possibly:

Gohan would have died saving Goku from the fall (or died from his wounds).

Upon meeting Bulma, he would kill her after learning how she found him and about the Dragonballs.

Having three of the seven Dragonballs, knowing their power, and armed with the Dragon Radar he would have hunted down and killed Oolong and the villagers and Pilaf.

He would then use his "being a child" to trick Master Roshi into putting out the fire at Mt. Frypan and claim the last two remaining Dragonballs.

Roshi, Ox King, and Chi Chi would team up to fight him and have him almost beaten until the full moon comes out and turns the tide.

The next day, Goku would use the Dragonballs to wish for immortality. However before he can, Kami would choose to come down (as he can not let this go on any further) and kills Goku.

or

during the fight, Goku hits his head and becomes good. Out of guilt for the damage he has caused, he decides to becomes Earth's protector. He then uses the Dragonballs to wish for everyone he killed to be revived.

One thing Iv always wondered is how would Goku have known what to do when he got to Earth he was a new born when he was sent to Earth so how could he remember his orders? Are Saiyan meant to have super good memories or something? Or does Freezas army program the infants mind like a computer or something?

Actually anime filler suggests that on the trip to Earth, the computer stimulated him by repeatedly telling Goku to kill/destroy (similar to how Kal-El was taught by Jor-El about Earth during the trip from Krypton). This was shown during Piccolo's training of Gohan.

why didn't Tarble destroy his planet?

His computer voice malfunctioned.

[Herms]

Are you sure? In the anime Goku had this to say:

Yamcha: Goku! Your tail... !
Goku: Kami-sama took it off. I don't really know what he meant, but he said that my tail was a real problem ever since he brought the moon back after it disappeared.

In the manga he says: "Yeah, God took it off. I don't really get it, but he said that he wanted to return the vanished moon to normal, and that me having a tail was getting in the way." In other words, the removal of Goku's tail because it was a problem came before the moon was restored, not afterward.

That's kinda weird about the anime subtitles. I wonder if he says something different in the anime, or if the subtitler made a mistake?

[Bando]

What's even weirder is that Funi's translation was more accurate.

Yamcha: Goku what happened to your tail?
Goku: Oh that? I got rid of it. You see it turned out that the moon could be restored if I lost my tail, so that's what I decided to do.

[lash]

One thing Iv always wondered is how would Goku have known what to do when he got to Earth he was a new born when he was sent to Earth so how could he remember his orders? Are Saiyan meant to have super good memories or something? Or does Freezas army program the infants mind like a computer or something?

I wonder that too. Raditz actually expected Goku to remember him.

[Eire]

Why wouldn't they remember? They are different kind after all, while most of fans tends to see them as aggressive and strong humans with tails.

[ThunderPX]

What I always wondered is, how was Goku supposed to find everyone on Earth and kill them anyway? He would never have learned to sense ki, and he didn't have a scouter. How would he ever be sure the job is finished?