Hello, Fanfictionites, and welcome to my epic crossover work starring the Ninja Turtles and the Marvel Cinematic Universe!

I try to stay as close to canon as I can, but for this work to work (haha, see what I did there?) I had to pull off a few continuity errors. They will be listed here and updated as I find more.

MCU:

-The story takes place in the MCU chronologically sometime after Captain America: Civil War. The events of Captain America: Civil War progressed somewhat differently than in the film. The fight between Tony, Cap, and Bucky never happened, and Zemo was captured without a hitch. As a result, both Captain America and Bucky Barnes were exonerated, and though the Accords are still in effect, they have very little power over the unregistered heroes.

-All characters in the MCU chronologically introduced after Captain America: Civil War have already been established.

-Loki has not yet had his post-Ragnarok change of heart, and displays much more of the overall cold violence we saw in the original Avengers film.

-[Spoiler Alert (Major)] Neither Yondu nor Ego died after the events of GOTG Vol. 2.

-[Spoiler Alert (Major)] Both Red Skull and Baron von Strucker are still alive, as well as any other HYDRA figureheads mentioned in the book that were killed off during the Marvel continuity.

-[Spoiler Alert (Minor)] Hulk never left Earth and crashed on Sakaar after Avengers: Age of Ultron.

-I managed to headcanon Doctor Doom, the X-Men, Daredevil and company, Ka-Zar/Savage Land, and the Fantastic Four into this version of the MCU, as well as many other heroes who don't technically exist in the MCU. Yet.

TMNT (2012 series):

-The events of this story take place in the TV show in the middle of Season 4, almost immediately after the events of "Earth's Last Stand." Although in this timeline, the Foot never left New York City and Shredder recovered from his injuries much quicker (my logic being if you re-watch the fight with him and Splinter, Splinter uses mostly debilitating nerve strikes and doesn't actually do relatively much harm to Shredder).

-[Spoiler Alert (Major)] In this timeline, Kraven cuts off Tigerclaw's tail, not Alopex.

-[Spoiler Alert (Minor)] April now possesses a rudimentary basic magic ability due to her exposure to the Aeon Crystal, which as Doctor Strange later notes is indeed an artifact possessing some magic within it. And when I say magic ability, I mean it in the loosest sense of the word possible.

-[Spoiler Alert (Minor)] In this timeline, Captain Mozar survived the Mothership being blown to bits in the events of "Earth's Last Stand" which is explained in his chapter.

I'm sorry if this ruins the story for you, but I've done my best and I hope you will still give it the time of day. Happy reading! Excelsior!

Chapter 1: The Bank Robbery

Shredder sat silently on his throne, reviewing the recent turn of events in his mind. Even though the Kraang had managed to take over the entire city of New York, those foul mutants that called themselves the turtles had managed to stop them. No matter what he did, they always came out on top.

Shredder pounded a fist onto the armrest of his throne in fury at the memory of Hamato Yoshi, that rat freak he once called his friend, defeating him in combat in Washington Square. He had allied himself with the turtles and Hamato Yoshi under the pretense of saving the Earth from the dinosaur-like Triceraton aliens and their black hole generator, but had secretly plotted to kill Hamato Yoshi for robbing him of his daughter Karai. Yoshi had caught on, and delivered a series of crippling nerve attacks to debilitate him. It had taken weeks to recover fully.

Tigerclaw, the second-in-command of the Foot Clan, came in and knelt before him. Behind his metal helmet, Shredder smiled. Tigerclaw had been an assassin/bounty hunter before being hired full-time by Shredder, and had proven himself a loyal warrior time and time again.

Now the big cat spoke with a growl. "Master Shredder, five strangers are here to speak with you."

"Send them in."

Tigerclaw stood up, and moved behind Shredder's throne. Eight of Shredder's Foot-bot soldiers took up positions, four on each side of the walkway leading up to Shredder. In walked five strange-looking men, closely flanked by Foot-bots. The first man wore a dark green cloak hood over his iron-masked face of which his mouth and large, yellow-orange eyes were exposed through slits. The second had a golden helmet with curved horns, and clothes that looked like they were from another world. He carried a golden spear. The third wore a Nazi uniform and had a red-colored face, with the skin stretched out over it to make it look like a skull. The fourth had a red and purple suit and floated on a metal platform. The fifth wore a white lab coat partially covering a metal belt which had four long mechanical arms attached to it.

"Who are you, and why do you enter my presence?" Shredder asked.

"Forgive us, my lord Shredder," said the metal-faced man, "but we have come on an errand of business."

"State your errand."

"Your recent campaign to take over New York City has come to our attention," the metal man said. "Loki here actually attempted that same feat several years ago. You might remember the alien invasion of New York in 2012? He was far less successful than you were."

"And I am an Asgardian," the man with the golden helmet said. "To say that a mortal has bested me in strategy is a bold statement. Were these different circumstances, I would not believe such a statement."

"Combining your efforts with ours, we want to pit our skills together and launch a full-scale invasion of New York," said the metal-faced man. "With the combination of our armies, we can crush anyone who gets in our way. Particularly Spider-Man and those cursed Avengers."

"I have also heard that some vigilantes have been causing you trouble," said the man on the metal platform. "Specifically, four turtle brothers and their rat father. I have no love for heroes of any sorts, particularly mutants. I am a mutant myself, you know. Join us, and these ninja pretenders, along with all our enemies, will fall."

Shredder smiled evilly. "It seems we have a common enemy."

"At last, Lord Shredder, we can introduce ourselves properly," the metal-faced man said. He bowed slightly. "We are the Masters of Evil. And my name, is Dr. Doom."

The ninja turtles were having a training session in the underground dojo of their secret home in the sewers. Their mentor, Master Splinter, had suggested that they practice a little bit. It had been several weeks since New York had been saved from the Triceratons and the black hole generator, and crime was at an all-time low. They hadn't seen hide nor hair nor tentacle from any of their bad guys in weeks. Even the Purple Dragons were a no-show. And all of them were getting bored.

The turtles were having a special match against their father. All four of them would be competing together against Splinter. The only rule: each of them would only be allowed to attack once. This exercise, Splinter said, would help them make the best of a single opportunity.

As his sons gathered around him with weapons drawn, Splinter began the match. "Hajime!"

Donatello opened up with a spinning jump kick that Splinter easily ducked under. As Donnie landed, Michelangelo aimed his nunchuck at Splinter's shoulder. "Gotcha, sensei!" he cried joyfully.

But Splinter caught Mikey's weapon and countered the attack with a blow to the chin that sent the turtle reeling. "Not today, Michelangelo!"

"Watch your back, sensei!" Leonardo jumped onto his father's back and put the rat in a wrestling lock.

Splinter flipped his son off of his back and onto the floor of the dojo. "Watch the floor, Leonardo!"

"Whuff!" Leo grunted as his shell hit the floor. Now Raphael made his move, charging towards Splinter. But the rat turned and knocked his son down with a sweep of his tail. With all four turtles down, Splinter declared the match over and retired to his quarters to meditate.

"Dude, that was totally epic!" Mikey said. "I think he knocked all the pizza stains out of my shell." He stood up, rubbing his jaw.

Suddenly they all heard a commotion at the main entrance. April and Casey had arrived with the turtles' most favorite treat: pizza.

"All right!" All four brothers dove in hungrily. They were always up for some pizza. "Mmmf! Mmmf! Thanks guys!" they managed to say between pizza slices.

"Eat up!" said Casey Jones. "You're gonna need the extra fuel on patrol today."

At least three times a week, the turtles patrolled the streets of New York City in search of their missing sister, Karai. She had been accidentally mutated into a snake, and Splinter was concerned for her safety.

"Turn on the TV!" Mikey said, diving for the remote. "Maybe we can get to see the marathon of Chris Bradford's 2 Ruff Crew!" 2 Ruff Crew was the turtles' new favorite show, their others being Space Heroes, Super Robo Mecha Force Five!, and Crognard the Barbarian..

The TV was tuned to Channel 6, and there was an important news bulletin on from Channel 6 News. "We interrupt this program to bring you this special bulletin from Channel 6 News," the TV said as a flashing Channel 6 News icon filled the screen. A dark-skinned man appeared on screen.

"This is Carlos Chiang O'Brien Gambe here," the man said. "Suprisingly shocking events going on in downtown New York, as a man calling himself Shocker is holed up in the bank." The mini-screen next to O'Brien's head showed a scene from the bank, where a bald man in a denim jacket with yellow padding on his forearms and a metal gauntlet on one arm was standing inside. "He seems to be able to charge up his gauntlet with powerful electric shocks," Gambe continued, "and there are several people being held inside the bank. So for all you people thinking about withdrawing money, I would suggest using a credit card for your purchases."

As the special bulletin ended and Chris Bradford's 2 Ruff Krew began, Raph, Donnie and Leo huddled up. "So do you think we should go check it out?" asked Leo.

"How?" asked Raph. "Unless you plan to walk. The Party Wagon got lost, remember? And those Kraang wrecked the Shellraiser awhile ago."

Donnie cleared his throat, and all present turned to look. "I might be able to help you out there, Raph," said Donnie with a smug smile. He raised a remote control and pushed a button, causing the garage doors to open. Inside was the Shellraiser, looking good as new.

"I give you . . . the Shellrasier Mark II!" Donnie said proudly.

As his brothers stared in amazement, Donnie continued, "The Shellraiser Mark II is just as good as the old one, with a few slight modifications. It has all the old weapons: a retractable top-mounted garbage cannon, a sewer lid shooter and bumper-mounted crushing jaws. Its armor is nearly impenetrable, its weapons are devastating, and its wheels crush Foot-bots underneath them."

Raph spoke up. "I take back everything I said about you not being awesome. Because this is TOTALLY AWESOME!"

"Yeah," agreed Leo. "Good work, Don."

Several minutes later, the Shellraiser Mark II pulled up to the back of the bank. The turtles jumped out and climbed up the fire escape, entering the building through an open window. There they crouched on the balcony, looking at the scene below.

Inside the Shocker man raised his arms, punching the bank vault's door right off its hinges. "All right, boys!" he said. "Get in there and get that gold!"

A team of Foot-bots started removing gold from the vault and taking through a hole in the wall outside to a white van. "I didn't know this guy was Foot," said Leo. "Is he some kind of new mutant?"

"Ooh! Ooh!" piped up Mikey. "As Official Name-giver, I will dub him with the name . . ." He paused for dramatic effect. ". . . Powersurge."

"Pretty sure his name is Shocker," said Raph. "And isn't that a different comic b

Mikey frowned. "Well, now his name is Powersurge!"

Suddenly a figure dressed in a red and blue spandex outfit came swinging through one of the windows of the bank and landed on the decorative chandelier hanging from the roof. "Whoa! Guys!" Raph shouted. "It's Spider-Man!"

All of New York City knew who Spider-Man was, even the turtles. They'd spent a long time watching him, even seeing him in action a couple of times on patrol before. "Stand down, Shocker!" Spider-Man shouted. "This doesn't have to get ugly."

"Spider-Man!" Shocker said. "Glad you could make it! Let the welcoming party begin!" He charged up his fist and punched a table off the ground, sending it hurtling towards the roof.

As Spider-Man swung towards Shocker, Leo spotted several people in trouble. "There are people down there!" He leaped over the edge of the balcony onto a wooden desk. A man stood on the desk, surrounded by four Foot-bots and scared to death. "Help!" he said. "These guys have me surrounded. I can't get down!"

"Don't worry, sir," said Leo. "I'll get you out of here." He drew his katanas and sliced the Foot-bots to pieces. With his guards gone, the man took off screaming for the exit.

Meanwhile, Mikey and Donnie were trying to help a woman who was trapped underneath a pile of debris. "Get me out of here!" she screamed.

"Please calm down, ma'am!" Donnie said as he and his brother cleared away the junk she was buried under. Once she was out, they pointed her towards the exit and she ran off.

Raph was trying to help a terrified man get out of his office. "I can't get the door open!" said the man. "The lock's jammed or something. Help!"

Raph had been trying to jimmy the lock with his sai and get the door open, but this hadn't worked. Finally, abandoning all formality, he kicked the door open with all the force his legs could muster. He then stepped aside as the man bolted for the front doors.

With the civilians safe, the turtles dove down on the Foot-bots loading up the van. Each Foot-bot, upon the arrival of the turtles, activated their four weaponized arms, but even this could not make them a match for turtle power. Soon all twelve Foot-bots lay in pieces.

By now the battle was over. Shocker had been tied up by Spider-Man's webs and hung helpless on the ceiling. Spider-Man swung down and landed by the turtles. "Always good to fight alongside a fellow hero," he said, extending his hand. Leo took it, and gripped it in a firm handshake.

"The pleasure is ours, Spider-Man!" Leo said, grinning.

"Yeah!" Raph said. "We're huge fans of yours!"

"Leo, people are coming in," said Donnie. "We gotta move."

"Aww," Mikey whined. "No time for an autograph?"

The turtles hustled out of the bank through the window as news reporters and policemen streamed into the building.