Steve and Tony gave Ace a tour of the Avengers Tower. He was impressed by the state-of-the-art facilities and advanced equipment. Despite having similar equipment in his mansion's lab, Ace noted that the equipment in the Avengers Tower was superior. Tony, with his reputation as a genius, most likely designed and built the impressive technology despite his somewhat arrogant demeanor.
Ace got along well with Steve and Tony. They chatted like they were long-time friends.
“So Rider, are you ever going to reveal your face to us?” asked Steve
“Maybe someday, Steve. I like to keep my identity a secret for as long as I can.”
“Come on, everything will be fine. Look at me; the media adores me, and many people are interested in getting to know me better. The ladies also are lining up for me." said Tony with a smirk
“I don’t want that kind of attention, Tony. I also don’t have a multibillion-dollar corporation to protect myself against the government. Besides, moving around in my private time is more convenient.”
“Well, I guess everyone does want your tech. Did you make them?” asked Steve.
“No, they were given to me. Don’t ask where they came from. Even I don’t know where.”
“Huh? Those things just don’t appear out of nowhere. You’re hiding something, aren’t you?” said Tony
“I don’t know what else to say. They were suddenly just given to me, and I want to use them to help people.”
Tony grumbles, still not believing Ace. Steve puts a hand on his shoulder to stop him.
“Let him go, Tony. He has his secrets to keep. Although it is worrying, we don’t know where those armors came from. I trust him to use them correctly. You’re very admirable, Rider. Not many people can restrain themselves from using their power for their own selfish reasons. You, however, did the opposite.
During their conversation, Steve gained an understanding of Ace's personality and character. Steve trusts his instincts and believes that Ace is a good person. After watching Ace's videos, Steve is confident that Ace will not misuse his power.
“Coming from you, Captain, it is an honor,” said Ace
The three continued to chat to get to know each other. Suddenly, an alarm blared on the main computer in Avenger Tower.
“What is that?” Ace asked
“It's the alarm if something big is happening in the city. I added it in case the Avengers ever need to mobilize.” said Tony
“Let’s go check it out.”
The trio made their way to the main computer to investigate the commotion. On the screen, they saw a 20-ft-tall yellow and white electrical humanoid creature rampaging through the streets, causing destruction and absorbing numerous individuals. The trio was horrified by the sight of this monster.
“Zzzax needzz more energy from humanzz! More humanzz! Zzzax muzzt feazzt!”
“What the hell is that thing!?” said Ace
“It is a creature made of pure electricity… How did something like that come to life? It is also intelligent; no, it is absorbing people to increase its intelligence.” said Tony, analyzing the creature
“Whatever it is. We need to stop it. Rider, can you help us?”
“You don’t need to say it, Captain. Of course, I will help.”
The Captain nodded, thankful for the Rider’s help. Hulk then came in to check the commotion. He had a bit of cream left in his mouth.
“What happened here?” asked Hulk
“Hulk, we have a big monster to stop. We are going to save people.”
Hulk sees the Zzzax on the screen and smirks. “Hulk smash, big monster!”
“Avengers! Assemble!” said Steve
Tony went to his armory and suited up. Many mechanical arms held pieces of Iron Man armor, which were attached to his body and formed the red and gold armor. Tony is wearing Mark X armor for this occasion.
Captain America wore his helmet with an A symbol and belt straps for his shield. The Hulk didn’t need to change, but he was eating snacks at the last minute, which Ace found amusing. They all rode on the Quinjet and headed toward the Zzzax location.
…
Zzzax is currently rampaging through New York. He is shooting electric blasts at buildings, causing massive devastation. He also absorbs more humans and could feel himself getting more intelligent, albeit slowly. But this did not matter. As long as he can consume more people, he will be happy.
“Humanzz have run… Only a few left to kill. Muzzt kill more! Get Zzmarter!”
The Quinjet arrived, and Ace, Hulk, and Captain America landed on the ground while Tony hovered above Zzzax.
“The Avengers are here! Even the Kamen Rider! We are saved!” said one of the fleeting people.
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Tony hovers a few feet from Zzzax, aiming his repulsors at him.
“Hey buddy, I suggest you surrender before things get ugly.”
“Muzzt kill more humanzz!”
“The hard way it is then.” Tony shot his repulsors, but it did not affect Zzzax.
“Weak human. Zzzax kill you!” He shoots electric blasts and hits Tony. He is sent flying, crashing into the ground.
“Tony! Are you okay?” said Steve
“Yeah, I’m fine,” he said as he got up
“Hulk fight! Hulk is the strongest!” Hulk leaps into the air and throws a punch at Zzzax. He responds the same way, but Hulk is at a disadvantage.
Zzzax has nearly limitless stamina and durability due to the quasi-physical nature of its body. His body is made of pure electricity, so the Hulk wouldn’t be able to harm him severely.
“Annoying, Zzzax doezzn’t want to fight you!” Zzax grabs Hulk and throws him toward a building. The green giant slammed on the building side and stood slightly disorientated.
“This is a tough opponent, but I’m sure we can win,” said Ace. He equipped the Build driver and revealed the rabbit and tank fullbottles. He gave them a good shake and inserted them into the driver.
[RABBIT]
[TANK]
[BEST MATCH]
Next, he grips the driver's crank and begins to turn it. Tubes emerge from the driver, forming armor parts behind and in front of Ace.
“Henshin!”
The armor parts combine seamlessly, with red and blue pieces interlocking to symbolize the Rabbit and Tank Fullbottles. These components are segmented diagonally, contributing to the armor's sleek and slightly rounded design.
(TECHNO ROCK MUSIC)
[HAGANE NO MOONSAULT]
[RABBITTANK]
[YEAH]
|Kamen Rider Build uses the power of Fullbottles to fight. Build transforms by inserting two Fullbottles into the Build Driver and turning the lever. Biotic-type Fullbottles are inserted into the right-hand slot and form Halfbodies that affect the left side of Build's head, his right arm, and his left leg. They are also themed after living things. Abiotic-type Fullbottles are inserted into the left-hand slot and form Halfbodies that affect the right side of Build's head left arm, and right leg. They are also themed after something physical rather than biological. Any pair of biotic and abiotic Fullbottles can create a Trial Form. Still, each Fullbottle has a Best Match with another Fullbottle, creating a perfect combination of powers that synergizes well. If they are used together, they create an especially powerful Best Match form.|
|The Rabbit & Tank form is Build’s most balanced default form. The rabbit bottle gives the user increased agility and speed. The tank bottle increases his defense and is equipped with Tank Roller Shoes on his right leg for kicking attacks; it can also act as a working tread to roll along on a flat surface.|
“Nice suit. It looks quite miraculous seeing you transform,” said Steve
“Haha, thanks. Doing a henshin is always my favorite part.”
Iron Man stood beside them. He was studying how Ace’s transformation worked.
“I still can’t figure out how your belt works. It is making me jealous. What do you call yourself in this form?”
“Call me Build.”
The Hulk snapped out of it and started attacking Zzzax.
“Hulk won’t lose to a monster!”
“We should help him,” said Ace
Captain America and Build run to attack, and Iron Man takes to the sky and rains down bullets. Build takes out his weapon called the Drill Crusher. It is a sword shaped like a drill. Build’s left leg glows, and he instantly moves next to Zzzax with the rabbit bottle's power. He attacks with the Drill Crusher, but Zzzax's body reforms after every blow.
Captain America throws his shield at Zzzax's face, which only annoys him.
“Annoying humanzz. Zzzax only wantzz human brainzz!”
“Sorry, but you can’t have that!” said Build, striking him in the face.
When the Hulk joins in, he grabs Zzzax and slams him into the ground. The Hulk easily lifts him up but is surprised at how light Zzzax is. Tony follows up with a hail of beams and missiles.
“Jarvis, what’s your analysis?”
“He is a being made of pure electricity, sir. He also seems to be able to absorb electricity to increase his volume.”
“So, we don’t get him more juice, got it, but how do we stop him?”
“Analyzing sir.”
Zzzax gets up and punches Hulk to the ground. He then sends electric blasts to Build and Captain America. Steve managed to block it with his shield, but Build was blasted away, tumbling into the ground.
“Need to change things up.” Build switches the fullbottles to Gorilla and Diamond fullbottles.
[GORILLA]
[DIAMOND]
[BEST MATCH]
“Build up!”
[ARE YOU READY]
(TROPICAL ROCK MUSIC)
[KAGAYAKI NO DESTROYER]
[GORILLAMOND]
[YEAH]
Build’s armor is now brown and bluish diamond in segments. His right hand is a giant fist, and his left is coated with diamonds.
|The Gorilla and Diamond form of Build has increased power in punches and reduced damage from the Gorilla Fullbottle. The Diamon bottle can allow Build to reflect attacks and manipulate light to create illusions. It can also transmute any matter into diamonds and can manipulate them.|
Build punches with his right fist to Zzzax, and the punch was not less weak than the Hulk. Zzzax stumbled for a bit, and Captain America jumped over Build, using him as a boost, and he used his shield to bash him in the face. Hulk sinks his hands into the ground and lifts the pavement, sending debris to Zzzax. His body was riddled with holes, but his body reformed as if it did not happen.
“Muzzt kill humanzz!” He sends electric blasts in a wind area toward the Avengers.
“Everyone get behind me!” said Build
Steve, Tony, and Hulk got behind him. Build raised his left arm, and a large pentagon-shaped diamond appeared in front of Him. The diamond reflected the electricity, and the Avengers were not harmed.
“We are getting nowhere. If we just beat him physically. He will only reform himself.” said Steve
“He is made of pure electricity, right? What if we short-circuit him?” said Build
“That’s it! But we are going to need a lot of water,” said Tony
“I got it!” replied Ace
Build changes the fullbottles to the Harinezumi and Syoubousya fullbottles.
[Harinezumi]
[Syoubousya]
[Best Match]
[Are you ready?]
“Build up!”
(Rock music with sirens)
[Rescue Kenzan ]
[FireHedgehog]
[Yeah]
Build's body now consists of alternating white and red segments adorned with spikes. Additionally, he features a knuckle on his right arm and a fire truck ladder on his left, referred to as the Multi Deluge Gun.
|The FireHedgehog form can create spikes all over his body with the Harinezumi Fullbottle, while the Syoubousya can manipulate fire and water and contain multiple rescue equipment. the Multi Deluge Gun can shoot coolant and cleaning liquids, as well as winch victims to safety thanks to an inbuilt power winch|
Build shoots water at Zzzax, and he starts to short-circuit and gets smaller.
“It is working; keep it up, Build! Tony, back him up,” said Steve
Tony breaks a fire hydrant and redirects the water to Zzzax.
“No! Getting weaker… Zztop!” He starts panicking and shoots more electric blasts.
A blast was about to hit Build, but Captain America stood before him to protect him.
“We are stopping you right here!” said Steve
“Hulk taking you down!” Hulk beats up Zzzax while he is being splashed with water. This allowed Hulk to deal more damage to him and speed up his weakening process.
“Let’s finish this.” Build cranks the driver for the finisher
Build stabs Zzzax with the Multi Deluge Gun and shoots large amounts of water. A white energy chart then surrounds Zzzax. Build jumps and drops down with his knuckles full of spikes.
[READY, GO]
[VORTEX FINISH]
An explosion was created, and when the dust settled, Zzzax was defeated, and his size was reduced to 5 feet.