Hello, everyone! PHANTOMKNIGHTMARE47 here, with the third chapter of Kamen Rider Nebula. In this chapter, Nakashima and co. arrive in Manhattan, NYC, in the universe of Teenage Mutant Ninja Turtles. Once there, they encounter Leonardo, Donatello, Raphael, and Michelangelo, along with their allies. Meanwhile, a new Darkmare starts attacking Manhattan, and Nakashima gets access to a new weapon, his first-ever gun weapon, and gets help from a Legend Rider in the form of Sento Kiryu, AKA Kamen Rider Build. Will Nakashima and co. be able to defend Manhattan from the Giganoidian Army and the Foot Clan? Get ready to find out in this newest chapter of Kamen Rider Nebula!

Disclaimer: Same as last chapter.

It shows Nakashima waking up, and getting dressed, before he headed to the kitchen, to see Asuka at the kitchen making breakfast for everyone.

"Morning, sweetums." said Asuka, winking at Nakashima. "I enjoyed what we did last night."

"Same here." said Nakashima, smiling a little, before realizing something "Aw crap! I forgot to wear a condom!"

"Don't worry, sugar-pie, I'm on the birth control pill." said Asuka, reassuring Nakashima that he didn't get her pregnant.

"Oh, thank God." said Nakashima, sighing in relief.

"Alright, everyone. Our destination's coming up." said Raymond, announcing their stop "Next stop: Manhattan, the universe of Teenage Mutant Ninja Turtles."

After everyone finished their breakfast, and washed their dishes, the gang got strapped in, as their ship flew through another dimensional rift.

(Cue Opening Song: "The Howl Towards Tomorrow" by JAM Project)

[Instrumental]

It shows all the Kamen Riders of the Showa-era, Heisei-era, and Reiwa-era throughout the years, until it shows Nakashima sitting on a hill on a starry night.

[Tachiagare kedakaku mae sadame wo uketa senshi yo]

Nakashima then gets to his feet, as all his friends are with him, and he reaches to the skies.

[Sen no kakugo mi ni matoi kimi yo ooshiku habatake]

Nakashima then reaches for the moon, and clenches his hand into a fist, and the logo for Kamen Rider Nebula appears in a glitter of stardust.

[Yami no jidai wo tsugeru kane ga tooku nari hibiku]

It shows Nakashima with his friends, relaxing at home, and Nakashima looks at a photo of his foster parents before their passing, and at a photo of his biological father, Ryo Murasame.

[Tatakau tomo yo ima kimi ha shi mo osorezu]

It shows the various members of AMPS, such as the leader, Commander Raymond Thompson III, Professor Jeremy Broslowski, Dr. Jonah Maxwell, Field Commander Ryuga Terasaka, and Lieutenant Asuka Shimada

[Gareki no machi wo somete shizumu yuuhi ha kurenai]

It cuts to the various allies that Nakashima and co. encounter on their travels throughout the Multiverse, such as: The Agents of W.O.O.H.P, the Knights of Mercia, Danny Fenton, Cal Kestis, Team Sonic, Spyro The Dragon, the Maximals, Steven Universe, Inuyasha, Mystery Incorporated, Ruby's Group, the Meisters of Death Weapon Meister Academy, the Order Of Mata Nui, Hero Factory, the Ninjago Ninja team, the French Miraculous Heroes team, and others.

[Aisuru hoshi no mirai wo mamoru tame]

It shows the group's means of transportation throughout the Multiverse, a ship known as the Galaxy Defender.

[Oo kami no yaiba ha hito no ai]

It shows the Giganoidians on their ship, the Nightmare Fortress, with the swordsman, Zankord, the general, Gextral, the assassin, Kenvardon, the jester, Jyrax, and their leader, Giganidas.

[Inori wo komete tsuranuke]

It shows the Giganoidian foot soldiers, the Blightoids, causing havoc on the streets of Winter Bluffs, until Nakashima does the movements needed to transform, and says "Ectophase Activate!", before transforming into Kamen Rider Nebula

[Tachiagare kedakaku mae sadame wo uketa senshi yo]

Nebula then fights against the Zomborgs in hand to hand combat, before he takes out a Grid-Card and slides it across the top of his belt, summoning his Nebula Calibur sword

[Asu no heiwa he no ishizue to nare]

Nebula then slashes and slices away at the Blightoids, cutting them down one-by-one.

[Atsuku nare ookiku sake ten ni sasageshi inochi yo]

It shows various other forms of Kamen Rider Nebula's, posing with their own personal weapons, as Nebula fights Zankord in a sword duel.

[Yowakimono no tate to nare soshite sekai wo michibike]

Nebula does his Galactic Rider Kick on a Darkmare, destroying it instantly, before driving off on his motorcycle.

(End of OP)

Chapter 3: Mutant Warriors of Manhattan!

Location: Manhattan, New York City

Universe: Teenage Mutant Ninja Turtles

The Galaxy Savior then made a landing, and Nakashima, alongside Yujiro, Sam, Gabriella, Britney, and Blaine exited the craft, to stretch their legs.

"Holy schnikes! New York City looks awesome!" said Blaine, with a smile on his face.

"You said it, dude." said Nakashima. Nakashima was a fan of the New York Mets, a baseball team. His favorite member was Kodai Senga.

The gang then walked around, until they looked to see some ninjas dressed in black and red, with an emblem of a red circle with a black foot in the center. These ninjas were part of the Foot Clan, they got their name due to stepping on the corpses of their victims.

"Aw crap!" said Yujiro, entering a fighting stance. Blaine got out the Dragon Fountain-Pen Sword, Gabriella got out a blaster, and Clover was wearing the Brawlin' Power Gloves.

Suddenly, four figures arrived. They looked to be humanoid box-turtles. The first had emerald green skin, and sapphire blue eyes behind a blue ninja mask, and wore a blue sash that had a silver belt-buckle with a blue capital "L" on it.

The second had medium olive-green skin, and reddish-brown eyes. He wore a purple ninja mask, and a purple sash that had a silver belt-buckle with a purple colored capital "D" in the middle. His carapace was gunmetal gray.

The third had kelly green skin, and emerald green eyes, with a crack in his plastron. He wore a red ninja mask, and a red sash that had a silver belt buckle with a red capital "R" on it.

The fourth and final turtle had light-green skin, and baby blue eyes. He wore an orange ninja mask, and an orange sash with a silver belt-buckle and an orange colored capital "M" on it.

These four mutant turtles were Leonardo, Donatello, Raphael, and Michelangelo, four ordinary box-turtles mutated into humanoid forms by an unknown substance, named after Renaissance-era artists, and taught in the art of the ninja.

"Time to kick some Foot Clan ass, guys!" said Raphael.

"It's Ninja Time!" said Leonardo, as he drew a pair of dual ninjaken swords. Donatello took out a purple and gunmetal-gray technologically-advanced bo-staff, Raphael drew a pair of sai, and Michelangelo drew a pair of nunchucks from the sides of his belt.

(Author's Note: The TMNT look like their IDW and 2012 selves, with Donnie having a prosthetic carapace and a tech bo-staff. Leo's voice-actor is Seth Green, Donnie's VA is Yuri Lowenthal, Raph's is Greg Abbey, and Mikey's is Robbie Daymond.)

"What the hey? Am I seeing actual humanoid turtles?" Clover blurted out, rubbing her eyes in shock.

"I'm just as shocked as you are, kiddo." said Stella, with a gobsmacked expression on her face.

"It's official. We've gone bonkers." said Blaine, as Britney was thinking the same thing.

"We must've had too much coffee this morning," said Britney. The gang then helped the four Turtles in fighting against the Foot Clan ninjas, and managed to drive them off.

"Thanks for the help, you guys." said Leo, walking up to Nakashima and co. "My name's Leonardo. These are my brothers, Donatello, Raphael, and Michelangelo."

"Greetings," said Donnie.

"'Sup." said Raph.

"Yo!" said Mikey.

"My name is Nakashima Kazuma, and these are my friends, Yujiro Shishigami, Blaine Johnston, Clover Ewing, Clover's mom, Stella, and Britney Watanabe." said Nakashima, introducing himself and his friends.

"It's a pleasure." said Leo, smiling a little. "C'mon, let's introduce you to the others."

Later, it shows a man who resembled Atsuhiro Inukai, walking through the streets of NYC. This was Sento Kiryu, AKA Kamen Rider Build. Sento used to be known as Professor Takumi Katsuragi, a scientist who worked for Faust known as "The Devil Scientist". Takumi admitted that he created the Rider System to combat the alien known as Evolto, who had been masquerading as Souichi Isurugi. However, Takumi had been knocked out, with Evolto using a dead comedian and musician known as Taro Satoh, and altered his face to resemble that of Takumi's, and he then erased Takumi's memories. Takumi then had his name changed to Sento Kiryu, and used his powers to defend innocent people from Faust.

"New York City looks downright amazing at nighttime." said Sento, with a smile on his face. He then walked around the city.

Meanwhile, it shows Nakashima and co. at the Turtles' Lair, where they met their mentor, Hamato Yoshi, AKA Master Splinter, a ninja who was mutated into a humanoid gray rat, April O'Neil, a news reporter, Casey Jones, a street-wise guy who fought by weaponizing sports equipment, Leatherhead, a mutant alligator who was mutated by the Utrom, and became their agent, and Slash, an alligator snapping-turtle mutated by Baxter Stockman, who despite his lack of brainpower, made up for it with incredible strength, and a big heart.

"So, there really are other universes out there." said Donnie, gobsmacked. "So that means that the Multiverse Theory really is real."

"Yep, big time." said Jeremy, nodding in confirmation.

"Not only are we facing off against the Foot Clan, but also one of their allies. A mafia don known as Don Vizosio." said Leo, with a serious expression on his face. "He had his scientists create Mutant Killer weaponry."

"Crap." said Blaine, shocked by this.

"The Foot Clan got their name by treading onto the corpses of their victims." said Splinter, explaining everything "And out of all of them, there is one who is the most cruel and merciless. His name is Oroku Saki, otherwise known as: The Shredder."

Meanwhile, it shows the Shredder speaking with Vizosio over dinner, with the mafia don having spaghetti, and Shredder having aubergine parmigiano.

"Glad you and your forces could come, Shredder." said Vizosio, as he bit into a meatball, while Shredder had his helmet, Kuro Kabuto removed, revealing that his face was burnt, resembling Freddy Kreuger. The leader of the Foot Clan bit into his meal.

"By the way, do you perchance drink wine?" said Vizosio "Because, what I have with me is an aged Chianti Classico, which is molto buono. And when it's paired with scamorza cheese, and caviar on a cracker, it's absolute perfection."

"Why yes. I often drink sa-ke, but it's nice to have a change of pace." said Shredder, as he sipped the wine. Two of Shredder's underlings, a mutant warthog known as Bebop, and a mutant white rhinoceros named Rocksteady was at another table, with Bebop having baked penne pasta, and Rocksteady having a pizza margarita.

"I promise, Shredder, these Mutant Killer weapons are more than capable of taking down both these "Mighty Mutanimals", as well as those dannazione turtles."

"Good," said Shredder, smirking. "Because soon enough, I will be dining on suppon-nabe."

(Author's Note: There will be examples of characters speaking foreign languages such as Japanese, Italian, Russian, etc.)

Later, it shows Nakashima and co. walking through the streets of NYC, until Nakashima looked to see Sento.

"Hello there." said Sento, smiling a little.

"Holy cow! You're Sento Kiryu, otherwise known as Kamen Rider Build!" said Nakashima, surprised. "It's an honor to be meeting a Legend Rider in person."

"The pleasure is all mine, Nakashima." said Sento, shaking Nakashima's hand. With Sento was Ryuga Banjou, AKA Kamen Rider Cross-Z

"Yo!" said Ryuga, with a smirk "My name is Ryuga Banjou, I'm a friend of Sento's who's also a Rider."

"It's a pleasure to meet you, Ryuga-san." said Clover, shaking Ryuga's hand. Suddenly, they heard a commotion, and they saw two of Vizosio's men holding Fullbottles, and they shook them, before they attached them to their necks, with one gangster becoming a Smash based off of a bison, and the other becoming a Smash based off of a king cobra.

"We can handle these scumfucks." said Ryuga, as he took out his own BuildDriver, as did Sento. Ryuga was holding the Great Cross-Z Dragon Fullbottle, and Sento was holding a red Fullbottle in his left hand, and a blue Fullbottle in his right hand.

"Saa, jiken wo hajimeyou-ka?" said Sento in perfect Japanese, as Ryuga grabbed the Great Cross-Z Dragon and turned it into its adapter mode, and inserted the Fullbottle inside.

[Kakusei!]

Ryuga then attached the Great Cross-Z Dragon in it's adapter mode into the ports on his Build-Driver

[Great Cross-Z Dragon!]

Sento shook the two Fullbottles, and twisted the tops, before inserting the red Fullbottle into the left port, and the blue one into the right port.

[Rabbit!Tank!BestMatch!]

Ryuga and Sento then turned the levers on their Build-Drivers, as what appeared to be model ports appeared in front of them.

[Are You Ready?]

"Henshin!" said Sento and Ryuga, as they then transformed into Rider Form

[TheHeavy Metal Moonsault!RabbitTank! (YEAAAAH!)]

[Wake Up Cross-Z! Get Great Dragon! (YEAH!)]

"The laws of victory are in effect!" said Build, smirking underneath his helmet.

(BGM: "Be The One" by PANDORA Feat. Beverly plays)

Build and Cross-Z then summoned their weapons.

[DrillCrusher!]

[Beat Closer!]

The two riders then fought against the Crush Smash and Venom Smash, landing strikes on the two monsters. Build then turned the Drill Crusher from a sword to a gun, and shot at the Crush Smash. Cross-Z then slashed and sliced at the Venom Smash. Cross-Z and Build managed to stagger the two Smash Monsters, and turned the levers on their belts. A chart appeared that held the Crush Smash in place, while a blue colored Eastern Dragon appeared.

[Ready?GO!VortechFinish!]

[Ready? GO! Draconic Finish!]

The two Legend Riders then did a Double Rider Kick, defeating the two gangsters, and forcing them back into their Human forms. The police then arrived, and arrested them.

"Now we've seen two Legend Riders in action," said Clover, amazed.

"Mind. Blown." said Blaine, dumbfounded.

Meanwhile, back onboard the Nightmare Fortress, we see the Giganoidians facing a new monster that resembles Another Kabuto mixed with the rhinoceros beetle monster from Armor Hero: Emperor.

"May I be pleased to introduce: Kabuterror!" said Jyrax, revealing the new monster to his fellow Giganoidians.

"At your service." said Kabuterror, kneeling before the Giganoidians.

"Go, Kabuterror, and cause as much havoc and mayhem in New York as you possibly can!" said Giganidas, commanding the new monster.

"With gusto," said Kabuterror, as he was then teleported down to Earth.

Later, it shows Nakashima speaking with Splinter, learning more from his past.

"So, you were once human, Splinter?" said Nakashima, surprised

"That is correct." said Splinter, nodding in confirmation. "I was taught in the ways of the ninja since childhood. Although, I had a bitter rivalry with the man who would become the Shredder, Oroku Saki. I fell in love with a woman known as Tang Shen, but Saki arrived and in our clash, murdered Tang Shen in cold-blood."

"Damn…" said Nakashima, saddened by this news.

"In retribution, I burned Saki's face with a torch," said Splinter, continuing his tale. "I moved to the United States afterwards, and I bought four baby box-turtles at a local pet-shop. One day, I encountered two figures, and I knew they were enemies. I fought against them, but an unknown substance that they possessed had came into contact with me, and since there was a common gray rat in the alleyway I was at, I was mutated into a humanoid gray rat, while the turtles I bought were given humanoid form, due to my human DNA."

"Holy crapola!" Nakashima gasped, shocked by this news.

"Afterwards, I carried the four turtles in a shopping cart, kind of similar to the fictional character, Lone Wolf carried his son in a cart." said Splinter, continuing his tale. "When I was young, I aspired to be an artist. So, taking inspiration from a book about history's greatest artists in Europe's Renaissance era, I named the four turtles: Leonardo, Donatello, Raphael, and Michelangelo, and taught them the art of the ninja."

"How come Donnie has a technologically advanced bo-staff, and a shining metal carapace?" said Nakashima, curious.

Splinter sighed, and spoke "At one point, Donatello risked his life in fighting against Bebop and Rocksteady. Bebop broke his original wooden bo-staff in half, and Rocksteady put Donatello in a coma by using his sledgehammer to shatter his natural carapace."

"HOLY FUCK!" Nakashima blurted out, shocked.

"Mind the language, please. There is no need for profanity." said Splinter, in a strict yet fair tone of voice. "A scientist known as Professor Honeycutt fitted Donatello with an unbreakable bulletproof prosthetic carapace, and Donatello used both Kraang technology and weapons-grade titanium to forge his new bo-staff. It can transform into a tracking device, a stun-gun, a dart-launcher, a selfie-stick, and so on. It is also keyed to his handprints, so he is the only one who can use it."

"Whoa." said Nakashima, surprised.

Later, it shows the Turtles, alongside Leatherhead, Casey, Slash, Sento and Ryuga storming Vizosio's base of operations, managing to dispatch several of Vizosio's goons with ease.

"I guarantee that takes care of Vizosio's flunkies." said Leatherhead, sounding similar to the Disney character, Pete, but with a Cajun accented voice.

"Now to kick Vizosio's sorry ass." said Raph, with his sai at the ready.

"I'd like to see you disgusting creatures try." said Vizosio, as he took out a Fullbottle, and jabbed it into himself, turning into a Triceratops and tank themed Smash.

"Time to bust out the big guns, Sento." said Ryuga, as he took out a knuckle-like weapon, and a different-colored Fullbottle, and shook the Fullbottle before inserting it into the knuckle, turning it into an adapter.

[BOTTLE BURN!]

Sento took out a large Fullbottle, and shook it, before twisting the bottom.

[GREAT! ALL YEAH!]

He then inserted the large bottle into his Build-Driver, while Ryuga inserted the adapter into his own Build-Driver.

[CROSS-Z MAGMA!]

The two Riders then turned the levers on their belts.

[Are You Ready?]

"Henshin!" said Ryuga and Sento in unison, as they transformed into their respective final forms.

[The Completely Peerless Bottle Brainiac! Build Genius! (Sugei! Monosugei!)]

[Searing Muscles! Cross-Z Magma! (ATCHACHACHACHACHACHACHACHACHA!)]

Both Build and Cross-Z assumed their final forms, with Cross-Z cracking his knuckles.

(BGM: "Burning My Soul" By J-CROWN and TaKu plays)

The group then fought against the transformed Vizosio, landing one strike after another. Leo managed to slash into Vizosio's hide with his swords. Raph managed to jab his sai into his eyes, and so on. The two Riders then turned the levers on their Build-Drivers.

[Right Side! Gyaku Side! All Side!]

"The laws of victory are in effect!" said Build.

"You're gonna go down hard, you mafia bastard!" said Cross-Z.

[Ready? GO! Genius Finish!]

[Ready? GO! Volcanic Finish!]

The two Legend Riders did a Double Rider Kick, connecting with Vizosio as the Blast Smash, and defeating him instantly.

The NYCPD arrived, and arrested Vizosio instantly, as the Turtles and their allies headed off.

Later, it shows Nakashima riding his second Rider Machine, Stellar Hunter, until he looks to see Kabuterror causing havoc in the Chinatown district. Nakashima then exited the vehicle.

"Hey, you bastard bug!" said Nakashima, scowling at Kabuterror, who then turned around.

"So, you're the little turd who is causing Lord Giganidas problems." said Kabuterror, scowling at Nakashima.

"Wow. Calling me a "turd"? That's really immature for a monster." said Nakashima, in a deadpan expression. He then did the same transformation movements as his father crossed with Kotaro Minami.

[HENSHIN]

"ECTOPHASE ACTIVATE!" said Nakashima, as he then transformed into Rider Form, and entered a fighting stance, fighting against Kabuterror. He then slid a new Grid-Card across the top of his belt.

[STELLAR MAGNUM, EQUIP ON!]

A gun-like weapon then appeared in Nebula's hand. It resembled the Dart Leader from Azure Striker Gunvolt mixed with the Garren Rouser. Nebula then shot at Kabuterror, nailing him with energy bullets.

"What in the fuck kind of bullets even were those!?" said Kabuterror, flabbergasted. He then noticed wisteria purple blood leaking from his arm. "I'M BLEEDING! You motherfucker! You made me bleed! YOU'RE DEAD MEAT!" He then fought against Nebula in hand-to-hand combat, trading blows with the lion-themed Rider.

(BGM: "Shine On" by ANTHEM plays)

Nebula then fought against Kabuterror, and managed to inflict some damage onto the monster. He then spun a wheel on the side of his weapon 10 times.

[Ichi! Juu! Hyaku! Sen! Man! Oku! Chou! Finishing Bullet!]

"Shooting Star Blaster!" said Nebula, as he squeezed the trigger on the Stellar Magnum, firing a barrage of energy shots at Kabuterror, shooting him full of holes.

"FUUUUUUUUUUUUUUUUCCCCCCCCCCCCCCKKKKKKKK!" Kabuterror screamed at the top of his lungs before exploding.

Meanwhile, back onboard the Nightmare Fortress, Giganidas was fuming, and was throwing a major hissy fit

"DAMN IT ALL TO HELL!" the Giganoidian warlord bellowed, infuriated by this. He then drew his sword, and started slashing away at a dummy in a fit of absolute anger. The training dummy was ripped to shreds within a few slashes.

"Ohhhhh, bloody Hell." gulped Zankord, nervous "I haven't seen him this furious before."

"Last time he threw a temper tantrum this bad was when I joined the Giganoidian army, I made the mistake of addressing him casually." said Kenvardon "That's how I lost my right eye."

Flashback….

It shows Giganidas facing Kenvardon, who was kneeling before Giganidas.

"It's a pleasure to have Giganodia's deadliest mercenary in my ranks." said Giganidas with a smirk on his face.

"The pleasure is all mine, milord." said Kenvardon

"You will be expected to be sent out on assassination missions and recon missions on a regular basis," said Giganidas.

"Whatever you say, Pal." said Kenvardon. Giganidas's smile turned into a scowl.

""Pal"?" said Giganidas, on the verge of a major rage-out before he then bellowed "DID YOU FUCKING JUST REFER TO ME AS "PAL", YOU INSIGNIFICANT PIECE OF FUCKING DAMNED GUTTER-TRASH?!" With that, Giganidas's fingernails on his left hand elongated into bladed claws, and he slashed out Kenvardon's right eye.

Flashback Over

"It was a brutal bloodbath. Lord Giganidas slaughtered a majority of my squadron, as well as several of his own foot soldiers who tried to restrain him. All because I made the rookie mistake of addressing him casually." said Kenvardon, explaining everything "Which is what earned Giganidas the title of "The Butcher Of Giganoidia"."

"B-B-B-Butcher!?" Gyrax gasped.

"He prefers to refer to himself as either "The Galactic Shinigami" or the "Brilliant Genius of Galactic Warfare", instead." said Gextral.

(Author's Note: Giganidas's VA is now changed to Crispin Freeman)

Later, it shows the group boarding the Galaxy Savior, such as the Turtles, April, Casey, Slash, Splinter, Leatherhead, and Mona Lisa.

"So, we're actually travelling to several other dimensions. How remarkable." said Donnie, as he and the others boarded the craft.

"Alright, everyone. Our next destination is the universe of Rosario+Vampire." said Jeremy, announcing everyone's next stop. Once everyone had boarded the craft, the Galaxy Savior then lifted off, and flew through a dimensional rift.

(End of Chapter 3)

("Run Around" by Jasan Radford plays)

(It shows Nebula riding his motorcycle on a racetrack during a cloudy day.

Things are starting to accelerate into something never

Stopping always troubled but

Now I think i'm getting dizzy too much spinning pace my

Patience line is thickening, quickening

It's getting too insane. I'm trying to maintain

Woah, woah, woah, woah, woah, woah, woah

You run around, I run around

We're all gonna run, run, run around

You run around, I run around

We all do a run, run, run around

(End of ED)

Next time, on Kamen Rider Nebula, Nakashima and co. arrive at the universe of Rosario+Vampire, where they meet the members of the Newspaper Club. But, a new Darkmare makes its debut to sow chaos between the Human and Monster worlds. Luckily, Nakashima gets help from Tsukasa Kadoya, AKA Kamen Rider Decade. Meanwhile, Tsukune is going through puberty, and is mustering up the courage to admit his feelings to Moka Akashiya, a Vampire who he had fallen in love with when he first started attending Yokai Academy. Next time: Chapter 4: Nebula+Vampire!