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This will make sense if you've seen the material, but I phrased it this way to
avoid spoilers.

In Dragon Ball Super, power levels go off the charts. Which is cool to watch
in the fight scenes. However, episode 27 showcases (`spoiler`
_[link](https://www.youtube.com/watch?v=e4_Q1KRpamA)_ ) how easy it is for
someone of such a high level to cause an irreversible catastrophe.

Since we later learn that our usual heroes and villains aren't especially
powerful in the grand scheme of things, and that there are numerically many
more beings with such high power levels, how do all these inhabited worlds
protect themselves from such powerful beings? Having a planetary defense
network is one thing, but if any one person could cause such a catastrophe,
how do you defend against that?

Is this just how the story/plot works, or are do all these planets have
defenses against this sort of thing?


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How do all the planets defend themselves?


Well the answer to your question would be "Mr. Satan", with regard to the
earth in Universe 7. Ever since the Cell arc where Mr. Satan took credit for
Gohan's win, he has been considered as the savior of the earth. Hence the
population are under the impression that his power is rivalled by none and he
is strong enough to defeat any beings that would put the risk of the planet or
life of mankind at stake

The main story of Dragon Ball revolves around the Earth in Universe 7 and
since the Z fighters happen to live there, they more or less keep the earth
safe. With regard to universe 11, we, later on, learn about a group of
fighters called the "Pride Troopers" who basically do what you described. With
regard to the other universes, we don't know whether they actually have any
organizations or any form of defense against these beings

You have to also remember that there is Jaco//the Galactic patrol which tends
to keep an eye on this regard, however they obviously do not have the strength
to fight against beings at that level. Also, every universe as a Supreme Kai
who happens to have multiple Kai's under him.(Like King Kai under Shin). They
usually would watch over these planets and keep a check with regard to this.


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Most of the planets don't sufficiently defend themselves. Many end up enslaved
or destroyed.

In the first or second episode of Z, It was revealed that the Sayans went
around conquering planets, often killing off all the inhabitants.

Frieza had a large empire of hundreds of planets before he was defeated by
Goku.


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# **TL;DR: They don't.**

First, let's take a look at the individuals and groups throughout the Dragon
Ball Universe that are capable of wreaking the levels of havok that you
describe. I'll mostly be limiting this analysis to Universe 7 to start with.

## **1\. The Gods**

The Gods, consisting of the Angels, the Kais, and the Gods of Destruction,
among a few others, are a powerful group of deities that preside over the 12
Universes and maintain balance. The Gods of Destruction are mostly responsible
for - you guessed it - destruction, so they cannot be expected to help defend
mortals from various threats. Similarly, the Angels are merely the attendants
of these gods, and do not directly take almost any actions beyond what their
respective god wishes of them. This dynamic can be clearly seen when [Beerus
refuses to take any action against Golden
Freeza](https://www.youtube.com/watch?v=iLKYwHlYTmg) when he arrives on Earth,
and when he does not attempt to stop Goku Black when he invades the present
timeline.

On the other hand, the Kais are tasked with ensuring mortals are able to live
in peace and advance themselves as much as possible. However, their approach
to actually accomplishing this is quite hands off. They do not intervene in
the affairs of mortals directly in the majority of cases, preferring to simply
observe and allowing them to engage in as much destruction as they please.
They did not make any effort whatsoever to stop Freeza and his family from
dominating the universe. However, they do occasionally provide their help in
cases of extreme universal peril, such as the first and second appearances of
Majin Buu in Universe 7, or Zamasu's rampage in Universe 7/10 (though the
Zamasu thing was sort of on them).

## 2\. Namekians

Namekians, though a peaceful race, boast very powerful fighters capable of
doing serious amounts of damage. Though most Namekians are not fighters, the
Namekian warriors we see fight against Dodoria and Zarbon have a power level
of roughly 3,000, according to the [Dragon Ball
Wiki](http://dragonball.wikia.com/wiki/List_of_Power_Levels). To get an idea
of how powerful that is, the same wiki lists Master Roshi's highest power
level at 180 - and he was able to destroy the moon with a Kamehameha. Despite
this level of power, though, they are actually the only Namekians we see
besides Nail (and Piccolo) that are able to put up any level of resistance
against Freeza and his soldiers. Though there may have been other warriors
that were killed offscreen, we can conclude that Namekian warriors of this
caliber are actually quite rare. As we saw, they were clearly not enough to
defend the planet.

## 3\. The Freeza Force

The Freeza Force is undoubtedly the largest organized force of powerful beings
that we encounter in Universe 7, in terms of sheer numbers. Though the average
Freeza goon is not **that** powerful (we see Roshi defeating many at once
during Resurrection F), they are still much stronger than the average mortal.
As well, the Freeza Force has quite a large array of very powerful
individuals, including:

  * Cui
  * Zarbon
  * Dodoria
  * The Ginyu Force
  * Shisami
  * Tagoma

And of course, Freeza himself.

The Freeza Force also has control of the entire Saiyan race, who are quite
powerful on average, similar to Namekians. The difference, though, is that the
Saiyans are a warrior race, so everyone was encouraged to grow as strong as
possible. It is hard to know the average strength of a Saiyan - I do not
believe it is ever stated - but even if the average Saiyan was only a tenth as
strong as Raditz, a low class warrior with a power level of 1500, they would
still be a very powerful force, especially with their Great Ape forms.
Remember, Roshi destroyed the moon with a strength of 180. It's easy to see
why Freeza destroyed them before they began to threaten him.

Finally, we have...

## 4\. Earthlings

The Earthlings, otherwise known as the Z-Fighters, are the other notable group
of beings in Universe 7. Assuming the farmer that encountered Raditz
represents the average human, humans are not at all powerful with a power
level of 5 according to [the
wiki](http://dragonball.wikia.com/wiki/List_of_Power_Levels). However, they
have the potential to grow quite powerful as seen with Krillin, Tien, and
Yamcha (don't laugh). The Earth has also produced other extremely powerful
fighters, including Goku and Gohan, the Androids, and Cell, all of whom are
astronomically powerful in the grand scheme of things. Consider that before
Goku came around, there was no one powerful enough to challenge Freeza - even
in his first form.

## Get to the point already!

All this is to say that powerful, planet destroying beings are actually not
that common. In the scale of the Universe, the fact that there are only around
4 major groups that deal with beings in that power scale tell us that this
isn't something that most planets are likely to encounter on a regular basis.
Indeed, the Galactic Patrol from Dragon Ball Super seems to be somewhat
influential, with their Galactic King being invited to the Universe 7/Universe
6 tournament between the Gods of Destruction, and yet we know that one of
their elite patrolmen, Jaco, is not powerful at all. Bulma threatened to [send
Vegeta to destroy Galactic Control
headquarters](https://www.youtube.com/watch?v=KtTYYMK_CK8), and Jaco was
scared silly. The Galactic Patrol has no way to fight him.

Knowing this, it is safe to assume that for the most part, planets do not have
any reliable way to defend themselves against extraordinarily powerful
individuals. Planet Vegeta was wiped out by Freeza single-handedly, and the
same would have happened to Namek if the Z-Fighters hadn't intervened.

Note that this does not necessarily apply to other Universes, though -
Universe 11 has the Pride Troopers, who seem to patrol to random planets and
[stop threats](https://www.youtube.com/watch?v=cYEhCudb1aE), and Universe 6
has the Saiyans, who [hire themselves
out](https://www.youtube.com/watch?v=hV9O_28Sq3g) to protect other planets.

# Update: The Galactic Patrol

As of the Dragon Ball Super Manga chapter 43, we can see that the Galactic
Patrol has been around Universe 7 for at least 10 million years. As well,
Merus, a member of the Galactic Patrol, was able to get the drop on Vegeta and
stun him with a stun gun, by Vegeta's own admission. It may be that the
Galactic Patrol does indeed have skilled members capable of holding their own
against powerful beings, and Jaco is merely an incompetent outlier.

# The Other Universes

To address the comments, I'll talk about how the other Universes deal with
such threats in more detail, since the above answer pertains mostly to
Universe 7.

**Universe 1:**

Not much is known about them, besides the fact that they have a very high
mortal level, making them exempt from the Tournament of Power. It's hard to
make any judgments here.

**Universe 2:**

We don't get to see their universe much, but it is seen in episode 91 that an
audition is being held to determine who will fight in the Tournament of Power.
This could mean that strong fighters are common here. As well, the fact that
the Tournament is public knowledge (it is later seen being broadcast to all of
Universe 2) could potentially imply that the gods of Universe 2 interact with
mortals more regularly, which could extend to defense (though this is
speculation).

**Universe 3:**

Universe 3 has [Katopesla](http://dragonball.wikia.com/wiki/Katopesla) among
their roster, who is apparently some sort of policeman in his Universe. Though
he is likely the strongest of them, since he was selected for the Tournament,
there may be more who, while weaker, have a high power level, and help defend
the Universe from threats.

**Universe 4:**

Though they fight in the Tournament of Power, we don't know hardly anything
about them. Considering how much of a jerk Quitela is, though, I doubt he
takes the time to defend any planets (especially since he's a God of
Destruction...).

**Universe 5:**

Like Universe 1, they didn't even enter the Tournament of Power, and we don't
know much about their Universe at all.

**Universe 6:**

As briefly stated above, Universe 6 has the Saiyans, who hire themselves out
to protect other planets. Frost also claimed to do a similar thing initially,
though it was eventually revealed he was instigating the conflicts that he was
resolving. Still, it shows there is at least some level of a formal defense
organization in this Universe. It's unknown what the Namekians of this
Universe do with their time (though they were all willing to fuse into
[Saonel](http://dragonball.wikia.com/wiki/Saonel) and
[Pirina](http://dragonball.wikia.com/wiki/Pirina) to ensure their survival).

**Universe 7:**

See my old answer.

**Universe 8:**

Same story as Universes 1 and 5: we don't know anything about this Universe.

**Universe 9:**

We do get a bit of insight into Universe 9. We know that this universe is
extremely difficult to survive in, since it was described by the Trio De
Dangers as a "garbage dump" (according to the
[wiki](http://dragonball.wikia.com/wiki/Universe_9)). Considering the utter
chaos the universe seems to be in when Sidra [destroys a
city](https://www.youtube.com/watch?v=WHfJh__qY48), we can probably assume
there isn't much in the way of defense for most planets.

**Universe 10:**

Though there are several strong fighters in this Universe, like Obuni, we
never get to see if there is any form of a defense force. It certainly won't
come from the gods, considering Gowasu's policy of leaving mortals to develop,
similar to Shin (this was also one of the reasons Zamasu betrayed Gowasu).

**Universe 11:**

As mentioned briefly in my old answer, Universe 11 has the Pride troopers, who
actively patrol the Universe and destroy threats, as seen
[here](https://www.youtube.com/watch?v=cYEhCudb1aE).

**Universe 12:**

Like Universes 1, 5, and 8, this Universe was exempt from the Tournament of
Power, so we didn't learn much about them.

## Summary

Overall, while it seems that some Universes have some level of defense for all
planets, many of them do not, and would have to rely on powerful altruistic
individuals to protect them from evil or destructive forces.


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