You all moved through the water, which leads to a deeper portion of Sector 4. 

(Y/N): Sector 4 already? 

Blake: Not only that, but there's also different locks around here. 

Samus: Must be the Level 4 Security ones. 

(Y/N): Okay, let's unlock these then. 

After a while, you all found the control panel that unlocks the Level 4 Security hatches. 

Not just that, but Samus accessed a new type of missile! 

Samus: Diffusion Missiles. 

(Y/N) and Team RWBY: OOH! Interesting! 

With these new missiles, Samus was able to freeze a lot of enemies, making them platforms for you all to get out. 

(Y/N): That should do it. 

The computer then contacted you guys again. 

Computer: You upgraded your missiles? That's unusual... There was no word from HQ. A procedural error, I'm sure... Even so, I did not approve of bypassing security Level 4. From now on you will use more discretion.

Samus: Duly noted. 

Computer: Anyway. I believe that the X have infected that Security Bot from before. That is to say, they have claimed the organic components that form its neural network. It has entered Sector 6. 

WIth that knowledge, all of you headed for Sector 6. 

In Sector 6... 

https://youtu.be/K4Yc6fpI1vQ

The Security Robot found you guys! 

Yang: Here it comes again! 

This time it had an exposed brain! 

Samus: Now we have our weakspot. 

It began to fire its weapons again, though this time, you all knew what attacks were coming, and of course, you all easily dodged over and over, and managed to succeed in causing it to revert to Core form, and then Samus absorbed it and got- 

Samus: My Wave Beam! 

Weiss: If I remember correctly, that lets you shoot through walls, right? 

Samus: That is correct. 

(Y/N): Awesome! 

Though nearby, Samus found something off, and fired to reveal a secret passageway. 

In this passageway was a secret lab... 

Samus: What is this? 

(Y/N): AGH! 

There were Metroid Hatchlings in a glass container. 

Ruby: Metroid hatchlings? 

Blake: What are they doing here? 

Samus: They can't be ... no. This can't mean- 

You all found something you all didn't want to see, there were Metroids in containers, as well as different types of Metroids! 

Alpha Metroid

Gamma Metroid

Zeta Metroid

Samus: WHAT?! ALPHA METROIDS?! GAMMA METROIDS?! EVEN ZETA METROIDS?! 

(Y/N): Wait, they can evolve? 

Samus: Yes, Metroids have the ability to evolve into creatures like that. 

Blake: This potential. They actually have the ability to do this. 

Weiss: And the scientists are cloning them? How c- 

An eruption was heard as the SA-X began to try to destroy the entire place! 

Everyone: WHAT IS THE SA-X DOING?! 

You all had to move as an alarm for detecting the lab sounded, and then- 

As soon as everyone got out... 

The lab was detached, killing all the clones, and the SA-X! 

Computer: You all ignored orders. 

(Y/N): DON'T GIVE US THAT CRAP! 

Yang: YEAH! DID YOU KNOW ABOUT THIS?! 

Computer: Yes. The Federation has been secretly working on a Metroid breeding program. For peaceful application only, of course. Please understand.

Blake: That's why there was a recreation of SR388 in Sector One! 

Samus: Yes, the ideal place for Alpha, Gamma, Zeta, and- 

Computer: Yes. Even Omega Metroids too. This research even uncovered techniques for rapid growth. Imagine...creating an Omega from a larval Metroid in days... But that research is finished. The X has smelled out its natural enemy, and one of the SA-X is on its way here...

(Y/N): Just one of- THERE ARE MORE OF THOSE MONSTERS?! 

Computer: Don't be so surprised (Y/N). You already know that the X reproduce by asexual division. Because of this mechanism, there are now no fewer than 10 SA-X aboard the station.

Ruby: Oh no, that's not good. 

You all knew something had to be done about this!