As the alien ship loomed over the city, a man came out of the rubble. 

Iairon (Rank 2 Class A Hero!) 

Iairon: What the? Is this City A? I can see headquarters, so ... 

He noticed the ship on top of him! 

Iairon: WHAT'S THAT?! It's floating! And it's huge! Is that thing responsible for this?! 

He saw the rubble around him! 

Iairon: THIS IS UNFORGIVABLE! 

Then something came behind him! 

The being attacked, but Iairon ducked before anything could happen! 

Inside the Headquarters... 

Ruby: LOOK AT THE SIZE OF THAT SHIP! SO COOL! 

Yang: Looks like we got work to do! 

Bang: Agreed. We must go immediately! 

Weiss: Hey, where's Saitama? 

Back outside... 

You saw Saitama in the air. 

(Y/N): Of course he goes right for it. 

Saitama: Aliens? Hmm ... 

The ship fired a bullet at him, and he dodged! 

Saitama: Did massive shells like that level City A? Well, that's better than laser beams. 

One went for him, and- 

While that was going on, Iairon slashed at the alien creature over and over again. 

Voices: A Belliose Life Form. And Cautios. Let us kill him. That is good. Kill. 

Iairon: My killer slashes haven't brought him down. That's never happened before. Is he invulnerable? 

Suddenly the monster unleashed an attack that took off Iairon's left arm! 

Iairon: WHAT?! That was- I can't beat this thing! 

Suddenly it began to contort! 

Iairon: It split up? Damn it! I can't die like this! 

Just then they were chopped apart by Atomic Samurai! 

Atomic Samurai: Iai, are you alright? 

Iairon: MASTER! 

The creature came forth and- 

Atomic Samurai: OUT OF THE WAY! 

He sliced through them into confetti! 

Atomic Samurai: Iai! The path of the sword does not end for you yet! So stop bleeding! 

Iairon: Yes, Master. 

But then it reformed! 

Creature: GWA HAHAHAHA! A life from on this planet that can fight me?! Go on! Resist our invasion! 

Atomic Samurai: Planet? Are you from space? And more of you are on that floating toy? I doubt you caused all this destruction by yourself. 

(Y/N): Okay Extraterrestrial Scum! Get ready for a fight! 

You, Team RWBY, Metal Bat, and Bang appeared. 

Ruby: You need some backup Mr. Atomic Samurai! 

Yang: After this battle, we shake hands! 

Bang: Tell us, did you destroy the city? 

Creature: And what if I did? 

???: THEN I WILL AVENGE ALL THE FALLEN MEN! 

Puri Puri Prisoner appeared and attacked with- 

Puri Puri Prisoner: DARK ANGEL RUSH! 

Meanwhile... 

Child Emperor, Genos, Tatsumaki, Superalloy Darkshine, and King made it onto the roof to see the ship. 

Child Emperor: Looks like the others are enough for the enemy on the ground. The problem is that huge weapon up above. We can't reach it up there. 

Superalloy: Hey King, you're near the top of S Clas, what do you think? 

King: I can't do anything. There is no way to attack it up there. The mysterious flying object has fallen silent. 

Tatsumaki: HMPH! You're pitiful! You call yourself the strongest?! 

Superally: Uh ... Tornado, if you anger King, he can kill you. 

Tatsumaki: ARE YOU GOING TO LET THE ENEMY GET THE JUMP ON YOU AGAIN?! I'll handle this myself! 

Genos: Wait, I will go too. It may not work, but I can attack from the surface. 

Tatsumaki: DIDN'T YOU HEAR ME?! I SAID THAT'S ENOUGH! 

Superalloy: C-Calm down Genos. I understand, but if you anger her, she will kill you. 

Genos: It doesn't matter anyway. Master already went to the enemy ship. 

Saitama made his way into the ship. 

???: Gwahahahaha! I'm surprised you made it this far, human! But go no further! You cannot defeat Groribas! My Acid Breath will- 

But Saitama punched his head off! 

Saitama: I've been tearing it up, but the ship doesn't fall apart. And I've defeated several guys who looked like leaders. It's about time I go for the Boss. 

In the Control Room... 

Tentacle Alien: IMPOSSIBLE! Groribas was one of our strongest! But he beat him! He's incredible! What's Melzagard doing?! That leaves me and him! Is he slacking off or -

???: Geryuganshoop. What are you doing? 

Geryuganshoop: AGH! L-LORD BOROS! My humblest apologies! One of the native inhabitants got onboard. 

In four minutes, he has destroyed 23% of the ship and killed any warriors who faced him! 

Boros (Leader of the Alien Invaders! He is seeking an opponent who can finally give him a satisfying battle!) 

Boros: The ship will not fall unless he destroys a power sphere. Btu he has only destroyed crew's quarters. The lesser warriors will be of no use. You, Groribas, and Melzargard are my top three warriors, so you must eliminate the intruder. 

Geryuganshoop: He's already killed Groribas. 

Boros: WHAT?! 

Geryuganshoop: I'll call on Melzargard! 

Back outside... 

Puri Puri Prisoner pummeled Melzargard to smithereens and you saw his ... 

(Y/N): 

https://youtu.be/iVN6XGQpL1M

Weiss: (covering eyes) NOT SOMETHING I NEEDED TO SEE! 

Ruby: (hiding) THAT IS FILTH! FILTH! 

Melzargard then regenerated! 

(Y/N): YANG! 

Yang: RIGHT! 

You both charged in and- 

(Y/N) and Yang: HIRYU SHOTEN HA! 

You both unleashed a massive aura attack onto him, and then Bang leaped up and struck Melzargard over and over, sending him flying back! 

(Y/N): WHOA! 

Yang: Nice one Old Man Bang! 

Bang: Do not underestimate someone of my age! 

Melzargard: Shall we contact ship? Have cannons finished this? Yes, that is good. 

One small piece of him came out. 

Small Melzargard: I go do it! MWAHAHAHAHAHA! 

But then Metal Bat leaped at him. 

Metal Bat: And just where ar you going?! 

He slammed his bat onto Small Melzargard, and hit him over and over again, for- 

Weiss: ICE MAKE: ICE TIME CAPSULE! 

She froze him and chopped him into pieces with both her rapier and Nichirin Sword! 

Geryuganshoop: Melzargard, what are you doing?! 

Melzargard: I'm fighting. 

Geryuganshoop: But we have an intruder! 

Yang: Wait, you don't think- 

(Y/N): Yep, Saitama is going where the party is! 

Back with Saitama... 

Saitama tried opening door after door and when he did-

Saitama: It broke. 

Back outside... 

Small Melzargard reformed. 

Small Melzargard: Yes. That is good. I have decided that I will rip your limbs off and decorate the ship. 

Weiss: He's back already?! 

Metal Bat: Time for batting practice! 

Weiss: Let me join in too! 

Metal Bat and Weiss attacked over and over! 

Iairon: Metal Bat! Master! Everyone! Direct Physical attacks don't work on that! We must rereat and use heat or find some other way! 

(Y/N): Sorry, but we got to fight hard! 

Blake: Well, here we go then. 

Melzargard started to attack back, but then you thought of an idea! 

(Y/N): Guys! Keep him busy! I'm going to try something! 

Everyone agreed and continued to keep Melzargard distracted! 

Geryuganshoop: Melzargard! Get back to the ship! The intruder takes priority! 

Melzardgard: I'd like to, but these guys are persistent! 

Geryuganshoop: Earth has life-forms who can give you a hard fight?! 

Melzargard: This isn't a hard fight! Tell me about the ship! 

Geryuganshoop: The ship is fine, but over half of our fighters are down! 

Melzargard: Concentrate the ship's fire on these guys! 

Geryuganshoop: I can't right now! And firing the cannons is the grunts' job! 

Melzargard: Well I can't return to the ship! 

Geryuganshoop: Fine, I'll tell the gunners. But if they hit you, don't die. 

Weiss and Metal Bat saw a marble. 

Weiss: Metal Bat, is this- 

Metal Bat: Hmm ... Ice Queen, want to play ball? 

Weiss: I thought you'd never ask. 

Weiss picked up the marble and tossed it at Metal Bat! 

Metal Bat: BATTER UP! 

He slammed his bat on it, and Small Melzargard died! 

Weiss: AHA! GUYS! THE MARBLE THINGS IN THEIR BODIES ARE THE WEAK SPOTS! 

(Y/N): Really?! 

Atomic Samurai: I'll slice away until I hit it! 

Back in the ship... 

Geryuganshoop: This is a warning to the intruder! Stop your destructive behavior and retreat! I'm warning you! 

Saitama: What the hell? 

Geryuganshoop: Otherwise, I'll kill you with everything I have! 

Saitama: I hear a voice that's inside my head. 

https://youtu.be/x-TEGpqWVjk

Saitama then broke his way into Boros' room! 

Boros: You came a long way quickly. Welcome to my ship. 

Saitama: Are you the alien leader? You really did a number on City A. 

Melzargard appeared. 

Melzagard: You really wrecked having on the ship! I Geryuganshoop, the universe's strongest telekinetic will smash you to bits! 

Saitama: So, you're psychic? 

Geryuganshoop: DIE HUMAN! 

He launched several pieces of rubble at Saitama, but it did no damage to him! 

Saitama: Anyone can do that! 

He threw one, and- 

Boros: So you defeated my subordinates. Well done. I am the leader of the Dark Mater Thieves, Boros! Dominator of the Universe! 

Saitama: I am the Professional Hero, Saitama! I don't know what the dominoes of the universe wants, but ... you guys destroyed the town, so I won't let you get away. 

Boros: Saitama, huh? Want to know why I'm here? There was a prophecy. No one in the universe was left to face me. I grew bored. But then a seer said that I could enjoy a challenging fight on this planet. That was 20 years ago. It took me time to get here. My subordinates think the prophecy was a lie to make us go away. But it was true! So excite me! It's what I- 

Saitama punched Boros! 

Saitama: Are you stupid? Attacking a planet just for thrills? Even the most bored office worker couldn't think of that! 

Boros then got up. 

https://youtu.be/c7m1DAlg304