Col. Blitzkert just walking around as his personnel are still working on the explosives to destroys the CORE to erupt the nuclear reaction to make an earthquake above the surface. He shaking up a bit and try to still calm for he is a colonel of the Fourth Reich, the most fearless SS of the world. While he was minding his business, an SS soldier run to him and salute as Blitzkert said.

Blitzkert: What is it, sergeant? I'm busying here.

SS sergeant: Apologize, heer standartenführer. But I have contact that the intruders are headed to the CORE right now.

Blitzkert: What!

SS sergeant: They took out the defense force at the resort and they're going here as we speak.

Blitzkert: Those heroes have been pain in my ass. Do they think they'll come to stop us from our mission. Not gonna happen, have the monsters deployed?

SS sergeant: Yes sir. Although I have a question, sir. Are you sure they are being tamed?

Blitzkert: Of course, sergeant. They are placed with data control chip all over their brains so they won't turn against us.

SS sergeant: I see, sorry for doubting you. I should prepare my troops there right away as well as our monsters.

Blitzkert: Good.

An SS sergeant salute to him and went elsewhere to be ready for defense. Blitzkert pulled out a gun syringe with red serum inside a tube, looking at it for a while then put it back to the pocket. He turns around and gaze at the CORE.

...

Freddy and the others cross the bridge and enters the CORE as there are like maze in it. The animatronics checking around if the nazis are hiding somewhere in the area. Asgore explains to them.

Asgore: Alright, everyone. This is a CORE. Now there will be maze and they have control the security so I expected to be ready whenever they have to get us. Is that understood?

Everyone nodded him. They went in to the room when a group of nazi soldiers blocking the doorway and they start shooting at then. Yuriko went front as she used psionic shield to deflects the bullets, taking small nazi soldiers to be killed while the others went to cover. Flowey sents his plant vines to takes down the nazis unconsciously. They proceed to enter to the another room when it was being blocked by veil shield. They cannot get in as nazi soldier mocking them on the other side.

SS soldier: Gehen Sie und versuchen Sie einzusteigen. Sie können nichts tun, um hier durchzukommen!
(Go and try get in. There's nothing you can do to get through here!)

Sonic: Uh, is he mocking us?

Chara: Yes, he is.

Flowey: Ha! I'm sure his face goes upside down when he realized it.

He's going to use his vines against him but then, they see Sans is in the other side of the shield. A nazi soldier didn't notice it until Sans spoke out.

Sans: Hey bud, why not just show some respect, will ya?

A nazi soldier just turned around and  surprisedly saw him out of nowhere.

Sans: Look man, if you really think you can be so confident then you should know that is wrong to say to my friends.

A nazi soldier is going to pulled out his gun but Sans use his soul manipulation as he grabbed him and slams at the wall. He find a way to remove the shield when he see a generator connects the shield so he destroys it and the shield is dispersed. Everyone went in and said to him.

Bon-Bon: You have a lot of tricks on your sleeves, Sans.

Sans: Well? What can I say, I am a skeleton.

Rainbow Dash: Right... Now let's go.

They continue running through the rooms to reach to Blitzkert until they encounter something horrifying. Few of children version of sniffers looking at them with their razor sharped teeth ready to eat them.

They are terrified of what those nazis have done to those innocent children turning into ferocious monsters they never seen in their life.

Rarity: Oh my Celestia! What are those awful creatures!

Papyrus: B-Brother. What are those f-fiends.

Sans: Bro... Those are children. But they are not humans.

Amy: How could they do to those children!

Cuphead: Bastards!

Knuckles clenched his fists as he never forgive them for doing on the children. Toriel is terrified of how they could to do such horrible act to the children. Then, they see two nazi soldiers beside with a creature who wears dirty WW2 uniform and it appears that a creature is controlling them.

A creature known as undead commander casts some kind of spell as the sniffers are started to hurt their minds until they were being controlled and order to attack them.

Kiryu: Here they come.

The sniffers running towards them ferociously as they are preparing to defend themselves to fight them.

...

Yagami and the others are being surrounded by nazi soldiers and monsters as The Axe open fire the chainguns at them. They spread out as the gunshot started. Rory tries to avoid getting shot from black sun soldiers since they have new type of bullet that can kills demigods like her, she took down few of black sun soldiers. Link slices off machete worker's right arm then cut off the head. He went to take down another one as it's attempts to sneak him from behind. Mettaton went on The Axe and goes to attack, but came to her surprise, The Axe caught her leg and toss to the wall hitting her hard. She gets up as she check herself for a small damage she was taken. She gazes at The Axe as he walking towards her.

Mettaton: Heh... You sure have some intelligence inside of you. Are you even alive, darling?

The Axe didn't say anything and start shooting at her. She went dodging the bullets and went to cover for a while. Mario use super star and becomes Super Mario as he rushed towards the enemy to take all of them down before it runs out. Shadow shoots down few of machete workers since they are walking undead robots being controlled by the Nazis. Kuribayashi reloaded the rifle and start shooting at the Nazis while Itami went to Tuka as they both fighting off the enemy as well. Yagami carry Whisper on his arms and went to the safe cover. Blaze charging her flames as she casts upon machete workers. Spike flying around the room as he shoots fireballs at small squad of black sun soldiers. Zelda took down a black sun soldier then she took out three more black soldiers. Link finish off a machete worker when he was being surrounded by more machete workers so he used his magic attack to take down a whole of them. Rory went on rampage to slaughter all enemy in this room.
Undyne joined her as both of them are having good time to fight the nazis.

Mettaton continue fighting The Axe a nazi cyborg shooting at her rapidly but she keep dodging it. Then, The Axe went to bull charge on her, unfortunately, he failed to hit her as Mettaton just move at the side and he just hit on the wall instead. He turn around and go after her when he was interrupted by Shadow for attacking him. The Axe quickly shoot at him but Shadow quickly dodge the bullets and then he spindash at the head, popping out from the shoulder. Shadow stopped as The Axe skull landed on the ground and the green light is faded away. The suit fell on the ground releasing purple goo from inside the suit. After the battle, they see there are no more enemies to come to stop them so they went to Yagami and Whisper to see them okay.

Zelda: Whisper, Yagami, are you alright?

Yagami: Don't worry, we are fine. Whisper is getting better for a minute so she can fight.

Whisper: Everyone, I'm sorry for leaving you behind. I was too worried about my friend. She is important for me to carry on the journey.

Spike: That's okay. She is important to you so we understand it.

She nodded him with a smiled then they heard a speaker as he said.

Dr. Schabbs (speaker): Well, well, well, it seems like you just defeat Major Schlieffen aka The Axe. He was going to meet you with open arms but you just have to ruin it.

Undyne: Oh yeah? Well, the major is dead and you're next! So why not just come out of there and see us so we can beat you up for what you have done.

Dr. Schabbs (speaker): Nein. I don't think I don't have time for that although I would like to meet me once you save your mobian friend before she will become a killer cyborg just like I did to the others. I'll be waiting.

The speaker turns off as Undyne throws a spear at it.

Whisper: We have to find her quickly!

Shantae: But this place is like a maze. How can we find her?

Silver: We gonna have to split up.

Yagami: Good idea. We'll find Tangled and find other prisoners who were kidnapped as well.

Rory: I'll go with finding a mad doctor. He will tell me how they able to develop a weapon to kill a demigod.

Zelda: Link, you will go and stop that mad doctor from creating more horrifying monsters.

Link: I'm on it!

Silver, Shadow, Link, Blaze, Mario, Luigi, Rory, and Mettaton went to find and stop Dr. Schabbs while Kuribayashi, Itami, Tuka, Yagami, Spike, Whisper, Shantae, Mimic, Undyne, Alphys, and Zelda went to save Tangled.

...

A sniffer was thrown into the air as Rainbow Dash clear them out of the way with her flying speed. Chara, Asriel, and Flowey take down so many sniffers with a knife, double swords, and vines. Asgore watched as the sniffers are going toward him. He grips on his trident as he just said.

Asgore: I'm sorry for not seeing you suffer.

Then, he swings his trident to kill them, putting them out of their suffering. Toriel shoots fireballs at the sniffers when another sniffers jumps from the behind but Sans shoots a skeletal bone to impale to the head. Both Cuphead and Mugman shoot a few sniffers running towards them. Applejack and Pinkie Pie are beating up the sniffers in close combat. The animatronics are also fought them as best as they can. Yuriko used psionic shield as the sniffers tries to attack her but they can't get through her. Twilight is charging her horn and release as the blast kills the sniffers. When there are no sniffers available in the battle, an undead commander order two nazi soldiers to deal with them. The two nazi soldiers are going to shoot them but Rosalina is able to disarm them, giving an advantage for Sonic to beat two nazi soldiers down. In the desperate time, an undead commander summons at least 5 zombies and order to attack them. Kiryu shoots every zombie at the head and he shot at undead commander's heart. After he killed undead commander, Kiryu takes deep breath as he tries to calm down, but he can't let go after saw the children have become monsters, a slaves serving to the Nazi.

Kiryu: Those monsters... How dare they turn those children into horrifying creatures.

Toriel drop her knees as she cry over dead children version of sniffers. Rosalina went to comfort her to calm down. Everyone have never felt that the Nazis are so cruel and merciless and worse, turning people into monsters serving to kill. Rainbow Dash couldn't stand of it so she hit on the floor angrily with her hoof.

Rainbow Dash: Why do they turn them! They  don't deserve it! Those Nazis thinking their superior race, well, I'll show them superiority when I get my hoofs on them!

Applejack: Dash, I don't see you acting like this.

Rainbow Dash: Of course, I am! Imagine Applebloom, Sweetie Bell, or worse, Scootaloo have being kidnapped and turn them into the freaks just like them!

Applejack: Hey! Don't you dare put my sister on it. They'll never kidnap her in Equestria.

Rainbow Dash: Oh yeah? Do you believe that Celestia will do anything to-

Twilight: Stop!

She break up both Applejack and Rainbow Ash preventing from fighting each other.

Twilight: I know both of you angry of this. All of us have felt it. But we can't just argue each other to slow us down from stopping Col. Blitzkert.

Freddy: She's right. Me and the others have felt to be killed by Purple Man and turn us into living soul animatronics. But this is worse than we have ever felt before. Let's go and stop him before any more innocent lives suffer like those children.

Everyone agrees to Freddy and went forward. Asgore went to his wife as he said.

Asgore: Come on, Tori. We have to go.

Toriel: I can't. I just can't bear to see these poor children turning into...

Asgore: Listen to me, we will stop them from happening. On my word, I'll make sure they will stand trial for the crimes they have committed. Okay?

Toriel nodded as she wipe out her tears from her eyes and went to others.

They are rushing through each room as they beat up nazi forces blocking their way. Rainbow Dash took down lasers and continues reaching to the next room. Finally, they reached to the door besides the elevator as it leads to the top of the CORE. They takes a deep breaths before ending to the room. When they enter the room, they see four monsters known as blitzkrieg raptors readying their blades on them, and in the front, it is Col. Blitzkert as he turns around at them and put an evil smile on his face and he said towards them.

Blitzkert: Well, that's the whole people here. Where are the others?

Ballora: They went to the lab to stop your cruel experiment.

Blitzkert: My experiment?

Gaster: Yes! Your experiment! Turning people into some horrifying monsters that you have create it!

Fluttershy: You also turn those poor children into those f-freaks!

Blitzkert: Ah... Those children, you say? They are from orphanages for no one to want them so I–no– we kidnap them, experiment them, and transform them into monsters. Our own monster created by the Fourth Reich.

Chara: You're insane.

Blitzkert: Define insane, little girl.

Chara: Hey! I'm a boy!

Blitzkert: Oh, I'm sorry. I didn't know it because you pink cheeks and a short woman hair that make you look like a girl.

Chara growled angrily as he grip on the knife handle.

Blitzkert: Speaking of the children, most of them aren't pure. So we did what we have to do.

Rosalina: This is wrong! You can't do that to children!

Blitzkert: Don't worry, they can be more children gathering in the orphanage. If there is, we take them away again.

F.Freddy: Hey! This is the Kingdom of Monsters, not your fucking Reich!

Blitzkert: A big talk coming from a soul child possessed a robot. But anyway, I have no time for this, once we destroy the CORE, it will create a mass earthquake to get a rid of those vermin on the surface. Men, women, and children will be crushed to death and show that the Fourth Reich has come for revenge. Blitzkrieg raptors, attack!

Four blitzkrieg raptors rushed in with their blades ready. Toriel jumps in as she sents a few waves of fireballs knocking them out and falling to the abyss. Toriel feel an anger as the flames lights brighter on her hands and her eyes look serious glancing at him.

Toriel: You will pay for your crimes, child murderer!

She runs toward him in full speed.

Cuphead: Toriel, wait!

She didn't listen as she give him a fire punch at the face. But he dodge it as she miss her target then he punches at the face and kicking hard to the stomach. She sent flying as she was going to fall to the abyss when Sans came to rescue her by using soul manipulation. The others stepped in as they outnumbered him. Asgore stepped in with his tridant as he said.

Asgore: It's over, Col. Blitzkert. You will surrender and end this madness.

Blitzkert: Oh, I don't think so. It's because I have a back-up plan.

He grabbed a gun syringe from inside a trench coat as he inject himself to the neck. He dropped it on the floor as he started for transformation. He felt pain, but he able to ease it. The others are shocked of what happens next, and that was when his skin started to melt and the blood have falling to the ground. Rarity is started to puke as she saw how disgusting it is to melt away the skins. Yuriko wide open her eyes to never seen so horrifying. Chica just went behind Bonnie to never witness his transformation. After the transformation, his head look down before he bring up with his red glowing eyes, glancing towards them with an emotionless expression.

Everyone just witnessed his transformation and become a monster. He suddenly laughed as he said.

Undead Blitzkert: *Evil laugh* Oh I like this new form. I never felt so much power!

He started to levitate into the air and create a demonic barrier arounds him. Sans putting on Toriel to safety as she landed on the floor. Toriel turns around horrifying to see him become a decaying creature with a demonic power. Blitzkert look down at them and put a sadistic smile on his decaying face.

Blitzkert: Look at me, I'm a monster just like you.

Toriel: You're not like me. And you're not like every monster living in the underground. You have become something worse.

Kiryu: You are no longer human anymore.

Rosalina: You have betrayed your own humanity.

Blitzkert: My humanity? Do you think I just toss away like it was nothing. No, you're wrong. This body may be monster I am, but I'm still a human inside.

Yuriko: Keep talking, you nazi freak. We can still outnumbered you.

Lelei: Even you have dark magic, we can find a way to beat you.

Blitzkert: You sure?

Then, few of nazi soldiers led by a commander as they come back from setting up the bombs on the CORE and went to see him.

Nazi commander: Heer Standartenführer, wir haben gerade die Bomben auf den KERN gelegt. Oh mein Gott...
(Heer standartenführer, we just finished planting the bombs on the CORE. Oh my god...)

He turn his head at his men with his sadistic smile and glowing red eyes as he said.

Blitzkert: You men have serve me for a long time since WW2. Now I shall grant you a reward.

Nazi commander: Belohnung?
(Reward?)

He raise his hand as he spawns demonic skull spirits and goes straight to his own men as they are started to being absorbed by his power.

Mugman: What are you doing?!

Blitzkert: Watch as I give them a special reward for serving me a long time ago.

They begun to transform into horrific monsters as they changing their forms. The soldiers who were SS becoming known as fire demon, the body started to burn like a fire they were but they remain intelligent of being human.

As for a commander, he changing into a same undead commander that they encounter at the corridor.

Blitzkert: Hehehe... Now it's time to test my new power.

He summons a lot of nazi zombies wearing old dirty WW2 uniforms as they are rising from hell. Everyone can't believe they are going to face a horde of nazi zombies led by Blitzkert in undead form.

Blitzkert: Commander, do your thing.

An undead commander use his spell to command nazi zombies and went to attack them in high speed. The heroes are ready themselves for a fight.

...

Itami and the others running through everh corridors to find Tangled before it's too late. When they were running, a group of veil assassins appears and went to attack them.

Yagami: Jesus! Who are those guys now?

He said, open fire at them. The others follows him as they going to defeat veil assassins. Shantae and Spike shoots fireballs together to critical damage at them. The veil assassins are defeated and they continue moving on. They keep running until they found a room leading to the laboratory. When they entered, they see Tangled is laying on the operation table and the nazi scientists are in the room so they shouted.

Kuribayashi: On the ground now! JSDF!

Itami: Hands up where we can see them!

Yagami: If you want to live, I suggest you to do what they said.

The nazi scientists raise their hands for surrender and drop their knees on the ground. Whisper went to Tangled as she removes her restrains and check if she is okay.

Whisper: Tangled? Tangled! It's me, Whisper. I'm here.

She shaking on her until her eyes started to open and see her friend is beside her.

Tangled: W-Whisper?

Whisper: Yes, it's me.

She hugged her. After that, Tangled went off the operation table and look around to see newcomers and scientists kneeling down with their hands up.

Tangled: Whisper, where are we and what is this place? And who are you people?

Kuribayashi: We're friends of Whisper. We come to rescue you.

Zelda: You and your friend have been kidnapped by these people and attempt to experiment on you.

Tangled: What! That's insane!

Alphys: Um guys, we should check if there are more people trapping here.

Undyne nodded her. She went to the scientists as she grabbed his collar and said.

Undyne: Are there more people here, punk? Answer me honestly and I promise that King Asgore will giving you a life sentence.

Nazi scientist: J-Jawohl. They're at the prison room.

Undyne: Good.

She dropped him on the floor showing him and his fellow scientists mercy.

Undyne: There are at the prison room. We should free them as well.

Mimic: Right! But how about them?

Tuka: Don't worry, I got this.

Tuka use her sleep spell cast upon nazi scientists to sleep.

Tuka: There. Now they won't go anywhere.

Itami: Wow Tuka, how did you learn that?

Tuka: I asked Lelei to teach me, father. *chuckles*

Tangled: Father? You mean his daughter is an elf. That's so cool!

Itami: Eh, an adopted daughter. It's a long story. Now let's go and free the people.

He said. Tangled finished changing his clothes and went to the prison room. When they got there, the prison guards saw them and prepare to shoot. Tangled use her tail to punched at both nazi prison guards and knock them out. More prison guards came and shoot them as the heroes went to fight them to free the prisoners. After that, they released all cell doors as the people went out surprisedly to be free the heroes goes to them and said.

Itami: Everyone, we'll get you out of here. Just follow us and you will be safe.

Male human: Thank you. You have no idea how we have been through here.

They get the people out of the X-Lab as they take them to the elevator.

...

Shadow and the others goes through nazi monsters as they are reaching to the huge size room. They looking around and saw a portal in front of them.

Silver: Hey. Is that...

Blaze: Yes, Silver. It's a portal.

Link: So that's how they got here. They have a portal to bring more soldiers for their operation.

Mario: I have a feeling like someone is coming for us.

???: That's right!

They heard a voice so they look up and fall back as a giant robot almost crush them. The heroes are going to  face against a robot used by Dr. Schabbs.

Dr. Schabbs: You like it? This model was build by the allies which we stole their design and use it for ourselves. Of course, it was only a prototype but I'm sure I can kill you all at once.

Silver: We'll see about that.

He was going to use his psychokinesis but the robot is too heavy he cannot lift it to the air.

Silver: Gah! It's no use. I don't think I can use my psychokinesis on him

Dr. Schabbs: This robot of mine was designed to make it heavy do your psychokinesis can't lift it.

Silver: Damn it! He must've seen me in action.

Dr. Schabbs (speaker): Now anyway, without a further to do, let's fight.

The heroes prepare for a fight and lauch themselves towards Dr. Schabbs robot.

...

Twilight unleashed her magic to blasts away a horde of nazi zombies. The animatronics are gunning the undeads as best as they could to prevent them go near them. Sans sent donw the rain of skeletal bones, killing them from the sky. Cuphead and Mugman shoots pearshooter at nazi zombie heads. Papyrus swings his long skeletal bone at the nazi zombies and Gaster kills them with his gaster blaster. Chara, Asriel, and Flowey beating up every nazi zombies in their way. Blitzkert seeing his zombie army are easily to be defeated, he decides to sent out fire demons to do a job. The fire demons rushed towards them with their fire claws and roar loudly. Toriel shoots fireball at fire demon, but it absorbs him create fire energy within boody  and shoots back at her. She was hit and fell on the floor near Asgore.

Toriel: We must not use fire magic. It makes them stronger and shoot back at us.

Asgore: Got it.

He said as he finished off a nazi zombie. Amy encounter fire demon as it breath fire at her, but she dodge it and hit the fire zombie with her hammer.

Amy: Nice try.

Sonic, Tails, and Knuckles are fighting off few of nazi zombies and tries not to get bitten from them. Foxy stabs a nazi zombie head with a hook then he shoots schockhammer at another nazi zombie to the head. Lelei casts missile magic arrows at the fire demons and they were easily defeated because they are weak. Asgore see the fire demons coming towards him so he swing his trident hard to kill them. Rosalina create a barrier on her to be protected from nazi zombies then she shoots out of them with her magical wand. Yuriko used psychokinetic burst to kill a whole nazi zombies around her then she she kills zombie commander before he have a chance to pull out a gun.

Yuriko: Undead commander is down. They're no longer being commanded.

A fire demon came close to her when the head was shot by Kiryu. He went beside her as he said.

Kiryu: Focus on the enemy first before saying anything.

Yuriko just nodded his words. Blitzkert makes it angry as he blasts demonic beam at them. Yuriko and Kiryi dodges the beam. He summons more nazi zombies from the hell and continues to attack them.

Baby: I don't know how long do we kill all of those zombies.

Ennard: Then, there is one thing we have to do.

Foxy: Aye, kill a leader. If that leader dies, there won't be more zombies coming to eat us.

Cuphead: That's a good idea.

Gaster: Everyone! We have to kill Blitzkert. It's the only chance to win this!

Everyone got to his words. Rarity and Twilight use their horns to blasts at Blitzkert's barrier.

Blitzkert: Ha! Your magic can't penetrate my barrier.

Rainbow Dash: We shall see if you can handle it.

She flew way higher before she dive down toward him to speed attack wach times. Pinkie brings out a cannon and blasts at the barrier. Applejack get a pile of rubbles and shoot at the barrier by kicking the rubbles. Yuriko use psionic slams on dead nazi zombies and throws at the barrier. Marionette shoots purple fire blasts at him. Baby shoots panzerfaust at him to weaken his barrier. Knuckles goes toward the barrier and punch it really hard. Tails shoots cannon beam at the barrier. Sans and Gaster are together to shoots their gaster blasters at him. Blitzkert is struggling to hold the barrier much longer and then, he feels tired so he giving up of holding it, breaking a barrier down.

Papyrus: Nyeh, nyeh, nyeh! I see that the barrier is down. Now let's slay this evil.

Blitzkert: You'll pay for that!

He creates fireballs around him and shoots at them. They dodges the fireballs and retaliate him. Rainbow Dash goes to him in full speed to give him a punch but he blast her off with a demonic beam. Fluttershy went to stop him but she was being taken out as well. Rosalina use her magic to rain down the fallen starts upon him. Blitzkert flies away to dodge the fallen stars. Flowey shoots him using the pellets. Kiryu shoots him at him with his rifle to kill him. Sonic hominf attack at him few times to damaging him. Papyrus throws few of skeletal bones at him to take some damage. Toriel shoots a wave of fireballs at him and Sans shoots gaster blaster ar him at the right side. Marionette goes in and shoots purple fireballs at him. The animatronics are shooting at him at once to critical damage on him. Blitzkert is getting too much hit by them, he was going to use large demonic energy ball to end this battle once and for all.

Blitzkert: I had enough of you! Prepare to die!

He shoots demonic energy ball at them. Gaster intervenes and shoots gaster blaster at the energy ball to block it. The blaster is too strong it pushing demonic energy ball back towards him. Blitzkert didn't realize he is lost as both gaster blaster beam and his own demonic energy ball hits him at once. He scream in pain really loud as he feel like he's going to die and fail his mission.

Blitzkert: AAARRRGHHHH! YOU CAN'T BEAT US! YOU HEAR ME, YOU CAN'T BEAT THE FOURTH REICH!!!

With his last words, he was being exploded into the pieces. The body parts of Blitzkert fell on the ground and then turn into the dusts. The heroes are exhausted but they finally to defeat him. They take rest for a long while to regain their strength back.

...

As the battle started, Silver being pushed back and got damage on him. Blaze tries to shoot fireballs at Dr. Schabbs robot but it wasn't effective. Link is trying to swing his sword at the leg but he was being swing attack by Dr. Schabbs. Mario and Luigi went up from behind as they slams on the head with their hammers, giving a critical damage on him.

Dr. Schabbs: Ow! That hurt!

He grabs both plumbers and thrown them at the wall. He switches to gun mode and blast at them. Shadow dodges it in zigzag and attack the robot in spin dash attack. Mettaton transform into Neo Mettaton as she blasts her cannon to destroy machine gun.

Mettaton: Sorry, darling. I just broke your gun. Hehehe...

Dr. Schabbs aim a blaster cannon at her and fire. She dodge it in the air and retaliate it. Rory swings her halberd at him as she said.

Rory: I will kill you for the crimes you committed against nature. You use science to bring back the dead for your selfish ways.

Dr. Schabbs: Selfish? Oh, Miss Rory, you must understand that my science is perfect!

He grabs her with his hand and pummel her using a fist. He throws her to the ground then kick right at her, sending to the wall as she hits it. Silver got him and use his psychokinesis on the objects and thrown at him. But Dr. Schabbs blocks off the throwing objects and shoot at him. Silver dodges it and goes near Link.

Link: He's too strong. We have to find a way to beat him.

Silver: I know. Let me think first.

He's thinking of his strategy to find a way to defeat him. He look at the portal behind him and it gives him an idea.

Silver: I have an idea. Link, shoot your bomb arrow at the portal. That would suck him into it.

Link: But it will suck us in as well.

Silver: Just do it!

Link feels hesitated then he takes his pride as he put a bomb arrow on the bow and aim at the portal behind him.

Dr. Schabbs: Fools! Nobody will stop me. I'm going to continue my research to make an army of monsters to rule the world!

Silver: Then I hope you won't be disappointed. Now, Link!

Link fires bomb arrow right at him. Instead of hitting him, the bomb arrow goes past through it and shoot right to the portal, crippled it into the pieces. The portal started to sucks in as everyone is about to go into the void. Silver use his ability to hold everyone while Link stabs to the floor and hold it as long as it can. Dr. Schabbs cannot believe he was being outsmarted by them. He was being sucked into the void despite he tried to hold on. He use his hands to grab on the floor near the void.

Dr. Schabbs: Nein! This can't be! I'm going to die! Wait, if I'm going to die, then everyone here is going to die with me! Hahahahahahahahahahahahaha!

With his last action, he grabs a detonator and press it. Afterward, Dr. Schabb robot was being sucked into the void and disappeared forever. Then, the void was closed. The heroes are okay now that the Dr. Schabbs and a void are gone. They were relieved at first, but the place is exploding as the ceiling is started to falling apart.

Silver: Everyone, let's get out of here!

They went out of the room and go through the corridors as there are more explosions coming to destroy X-Lab. They go through every corridor until they got into elevator platform and go up before X-Lab is completely destroyed.

...

Hans woke up immediately after he sense something on his head. He stands up and approaching to the magical sphere on top of the table.

Hans: What is it you wake me up this time?

He touches the sphere as it shows the vision of Blizkert and Dr. Schabbs defeated. After that, he let go the sphere and make a sigh, waving his head for disappointed.

Hans: Such a shame. You two did a fine work and you failed me. But their sacrifice won't go in vain. I'll see you in valhalla.

...

After they defeated Blitzkert and Dr. Schabbs, which resulting the destruction of X-Lab, they made it out of MT. Ebott. Asgore contact his royal guards to take humans to the hospital for medical treatment while taking nazi prisoners to the prison. They made it to the castle as the heroes are resting there for a long while. Tails and Yagami got the evidences of Nazi existence and horrible experiments that would turn people into monsters. The others are shocked to see a cruel things that the Nazis done to them. But their anger have to be stopped as they are tired after the fight. They went to bed and take some sleep then they will plan to warn to the world about new threat is coming to bring a war to entire nations.