Ace witnessed the destruction in Harlem through the live feed on the news. He watched in horror as Abomination wreaked havoc, taking pleasure in causing chaos and taking lives. The sight fueled his anger - how could anyone take joy in such senseless violence? Simply because they had gained power? As he received a call from Captain Stacy detailing the dire situation in Harlem, Ace knew he had to act quickly to offer his assistance.

“Please be careful Ace-sama. From my scans. This opponent will be dangerous.”

Ace smiled at Izu, thankful for her thoughtfulness. “Yeah, thank you, Izu. It seems I might have to get serious for a bit.”

Ace rode on the Ridevendor and went to Harlem at max speed. When Ace arrived, he saw Tony on the ground with his armor damaged and Peter recovering from a crash. He didn’t see Hulk nearby but he was sure he would be back soon. That guy doesn’t go down that easily. He stopped between Gwen and Abomination. Gwen was relieved that backup had arrived. Even she was not confident in taking down Abomination by herself.

“Rider, you’re here. I thought I was toast for a moment.”

“I couldn’t exactly ignore the screams of the people. Of course, I would come to help.”

Ace looks at Abomination with fury behind his mask.

“You won’t get away with what you have done. We will stop you!”

Abomination only laughs at Ace’s declaration.

“And what will a puny human like you can do? I have gained ultimate power! No one can stop me! Not even the Hulk!”

“Quite arrogant of you, but let me warn you that I am quite strong.”

Ace equipped the OOO Driver, inserted the Taka, Tora, and Batta Core Medals, tilted the driver, picked up the O Scanner, and scanned the driver.

“Henshin”

[TAKA, TORA, BATTA]

[TA-TO-BA, TATOBA, TA-TO-BA]

Different colored medals surrounded Ace, creating red, yellow, and green armor. His helmet was red with a hawk motif and green eyes. His arms were yellow with three claws on each arm, and his legs were green, resembling a grasshopper's. On his chest, there was a ring with a drawing of a hawk, tiger, and grasshopper. This is Kamen Rider OOO’s default form Tatoba Combo.

OOO harnesses the power of Core Medals, with each medal adorned with the representation of a specific animal. Depending on the medal he utilizes, OOO acquires corresponding abilities. For instance, the Taka head enhances his vision, enabling him to discern weaknesses. His arm claws facilitate striking enemies, while his legs provide heightened jumping and kicking prowess.

Gwen saw his new form and was excited to see what it could do. She truly wonders how many armors he has. Every time they meet, he always seems to have a different one, each different from the rest.

“What do you call yourself in this form?” she asked

“Call me OOO.”

“Oh, is it because of the three medals you use?”

“Something like that.”

“RARGH. Even if you wear that armor. It won’t change anything.” said Abomination. He is mad at OOO and Gwen for ignoring him for a moment.

“We’ll see about that.”

As OOO rushes toward Abomination, he unleashes a flurry of claw strikes, evading Abomination's attempted punches with nimble deftness. Using his agility, OOO leaps into the air and delivers a powerful double kick to Abomination's face, causing the menacing figure to stagger backward. Seizing the opportunity, Gwen joins the fray, delivering a swift and forceful swing kick to Abomination's face, sending him crashing to the ground.

As Abomination rises in a fit of rage, he hurls a car at OOO. In response, OOO deftly summons his sword, Medajaribur, a katana, and skillfully slices the hurtling car in half. With his trusty Medajaribur in hand, OOO launches a barrage of attacks against Abomination. Each strike of the blade leaves a visible cut on Abomination's skin, but to OOO's dismay, the wounds heal at an astonishing pace.

“You cannot stop me!” Abomination punches OOO but he blocks the fist with Medajaribur. The ground beneath OOO’s feet cracked while holding back his punch

‘What power.’

Suddenly, Abomination is blindsided by an unexpected attack from behind. Tony, rejoining the fight, unleashes a volley of covering fire, providing support for OOO in the intense battle.

“I thought you would be out Stark.”

“It is going to take a lot more than a punch to bring me down Rider.”

“RAGH, annoying insects.”

OOO backed up, changed the middle Core Medal, and scanned the driver.

“I’m going to need more power.”

[TAKA, GORILLA, BATTA]

OOO’s arms changed from yellow to silver with large gauntlets called Goribagoon gauntlets. OOO punches Abomination and each punch deals major damage.

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“Urgh”

“How do you like that?”

“Don’t underestimate me!”

OOO and Abomination punch each other, their fists connecting with such force that each strike shakes the ground. Gwen and Iron Man are surprised by the immense power they are displaying, but they cannot just stand there and watch. Gwen webs Abomination’s feet, making his foothold uneven and giving OOO an opening to attack. Iron Man shoots electric blasts to interrupt Abomination’s attacks.

“Don’t forget about us!”

Peter on Hulk’s back was charging toward Abomination. Peter managed to convince Hulk to work together. Although he was stubborn at first, Peter's words managed to sway him.

Peter webs Abomination’s face blinding him and Hulk spear tackled him sending him flying, crashing through the street.

“Nice of you to join us, friend.” said OOO

“Hulk, friend?”

“Of course, we are all friends here.” said Ace as he patted Hulk’s shoulder

“Now then, let’s smash this overgrown amphibian.”

Hulk smirks, feeling good to be working with other people despite his reservations. “Hulk, crush gray man!”

“And it is time for me to get serious.” said Ace as he changed the head and leg Core Medals.

[SAI, GORILLA, ZOU]

[(DULL THUD) SAGOHZO... (DRUM BEAT) SAGOHZO]

In a dramatic transformation, OOO adorns a formidable full silver armor with piercing red eyes, entering his Sagohzo Combo. Empowered by this form, OOO possesses superhuman strength, the ability to manipulate gravity, and the capacity to deliver powerful headbutts through the Sai Head. Additionally, with the Zou Legs, he can unleash seismic forces, causing minor earthquakes to shake the battlefield.

*Insert Kamen Rider OOO OST - Sun Goes Up*

“HAAAAH”

OOO yells, releasing a powerful aura. He feels immense strength running through him. Using a combo not only amplifies his physical prowess but also unleashes the full, untapped potential of the power contained within the Core Medals.

Tony, Gwen, and Peter could feel the power emanating from OOO. Compared to before his power multiplied, surprising them.

OOO launches a copy of his Goribagoon gauntlets at Abomination. He gets hit and Hulk follows up beating him up. The two behemoths clash exchanging blows but Abomination has the upper hand with his military experience. Gwen and Peter webs his hand and Tony shoots a unibeam aiming at his face.

OOO joins in smashing Abomination with the Hulk. Each strike sends shudders to Abomination and his healing factor couldn’t keep up. His bones are getting broken from the combined assault of OOO and Hulk.

“HAAAAH” OOO beats his chest like a gorilla and everything starts to rumble like a small earthquake. OOO manipulates gravity, sending Abomination into the air. The nearby debris and pavement were also carried, making a mini tornado. Debris kept slamming into Abomination and he couldn’t get out of OOO’s gravity manipulation.

Hulk jumps toward Abomination and slams him to the ground. “Gray man go DOWN”

Abomination sluggishly gets up, his body battered. “How, how could I be losing?”

“You have paid the price for your arrogance. Let’s finish this.”

OOO scans the driver for the finisher.

[SCANNING CHARGE]

OOO leaps into the air and slams back to the ground creating three silver rings. The rings move to Abomination and he gets encased with debris and slowly moves toward OOO.

“Hulk, this is the last hit. Give it everything you got.” OOO gauntlets and horn glowed in energy as Abomination gets closer.

“Hulk, SMASH”

“Seiya!”

Hulk and OOO strike Abomination creating an explosion. He is sent flying and crashes on the street unconscious.

“Is it over?” asked Peter

“Yeah, it’s over.” replied OOO

Tony lands and talks to OOO. “We finally met. It is nice to meet you Rider.”

“I feel the same Stark.”

“That was an impressive display there. Did you manipulate gravity? Are those coins the power source? How many armors do you have?”

“That is a secret Stark.”

“Oh come on can’t you answer at least some.”

“Fine, the medals are the source of my power.”

“Did you create them?”

“No, they were created by ancient alchemists centuries ago.”

“What? How did you get that?”

“Secret, you wouldn’t believe me even if I told you.”

Stark grumbled because OOO was keeping secrets from him. He is very curious about the power of Kamen Rider. Some of his powers came from technology while some are just straight out of fiction. Even he can’t explain the power of his current armor. He said his power came from those medals, but how did you make one of those? He guesses he has multiple of those seeing him exchange them and using them in combination or a set gives immense power. But he said it was created by alchemists centuries ago, alchemists! He can’t really wrap his head around something so fictional.

“How about you Hulk, what are you going to do?” Ace asked Hulk, he knows Hulk has been on the run ever since his birth. Ace knows he is a good fella and wants to help him.

“Hulk don’t know.”

“Then, Hey! Tony, how about making Hulk an Avenger.”

“What!? The big green guy?”

“Why not? He is one of the strongest guys on the planet and Bruce Banner is a renowned scientist. You will be having the brains and the brawn.”

“Grrr… Puny Banner.” Hulk doesn't like his other weak self. He and Banner don’t see eye to eye and the latter wants to get rid of him.

“I know you don’t like him, Hulk, but he is also you. You are the same person so you need to work together.”

“Hmph”

“Hah… Well Stark, why don’t you contact Fury. I’m sure he would love to recruit this big guy.”

“Fine, I’ll call him.”

Gwen and Peter approach OOO and Hulk to chat. They looked a bit battered but otherwise, they were fine.

“Hey you two, good job.”

“Yeah, thanks. But seriously you were amazing OOO. I can’t believe you can control gravity.” said Peter

“I can do a lot more depending on the form I’m using.”

“Hey, Hulk right? Thanks for helping.” said Gwen

“Hulk did not like gray man. Hulk can beat him alone.”

“I’m sure you can. But a little help wouldn’t hurt. We are all comrades anyway.” said Gwen patting Hulk

“Hulk comrade?”

“Of course, we all fought together. So that makes us comrades.”

“Hulk, like comrade… Hulk friends with spiders and circle man.”

“It is nice for you to think of us like that Hulk. But I hope you call me Kamen Rider or just Rider instead of circle man.”

“Okay…”

A helicopter landed nearby, and Ross arrived with his men surrounding the Hulk. OOO stepped in front of the Hulk to protect him. Hulk growls at Ross, he knows him and hates him to the core.

“I suggest you hand him over to us.” said Ross

“Why? He doesn’t belong to you.”

“He is a fugitive and belongs to the US Army.”

“Hulk belongs to nobody and he is my friend. And don’t think I don’t know what you did Ross. I know your experiments. Your soldier over there destroyed so many lives. I’m sure the media would love to know this story.”

Ark easily found the recording of Blonsky transforming into the Abomination. Spreading this information will be too easy.

“But if you still insist.” OOO stomps his feet and a small earthquake is created.

“You’re going to have to go through me.”

Ross was about to order his men to capture the Hulk. He wouldn’t let this chance slip away but was stopped by Iron Man.

“Okay, that is enough. Ross, tell your men to stand down. Hulk has officially become a member of the Avengers. He will be coming with us.”

“What! You can’t do that.”

“I just spoke to Fury and he accepted Hulk. But… if you have something to say then talk to Fury.”

Ross trembled in anger, wanting to capture the Hulk but hesitating to provoke Fury, especially when the Rider had incriminating information on him.“Retreat, I repeat everyone retreat.”

The military retreated, taking Abomination with them. The tension eases now there are no problems.

“Now you’re safe Hulk.” said OOO patting Hulk’s arm.

“Thank you.” replied Hulk

Betty walks toward Hulk before stopping a few meters away from him. Hulk was hesitant but OOO pushed his back.

“Go on. Talk to her.”

Hulk walks to Betty to have their talks.

“This is one hell of a night.”

“You can say that again.” replied Gwen.