TMNT x Spy Girls (Equestria Girls OCs) Crossover

April, Casey and the girls goes into the sewers and went deep to the part where they find the April's Friends' Home.

"The sewers?" asked Heart.

"Gotta admit, the sewers might have been gross, but their home is.. Is actually so cool." said Diamond.

"My thoughts exactly, Diamond." said Lightning.

"So where are these, friends of yours, April?" Rainbow asked.

"Their training right now, but they should be out in a few minutes." April explained.

"Okie-dokie." said Heart.

After April, Casey, and the girls were having a few minutes of discussion, the turtles comes out of the dojo when their training was done, and they were shocked on what they saw. (That April and Casey brought more humans to the lair). Even Master Splinter was surprised.

"What is going on here?! April, care to explain, why is there more humans to our secret hidden lair? Master Splinter said curiously but a little furiously.

"Umm..." April said nervously.

As soon as the girls saw the Turtles and Master Splinter, they've gone in a shock.

"Am I seeing things, or am I seeing a talking rat?" Musical asked.

"Definitely a talking rat, Musical." Diamond said firmly.

"April, you didn't tell us you're friends with these...mutants." said Lightning firmly asked.

"They seem... quite interesting. Mutant turtles and a mutant rat" said Rainbow.

"Anyway.. My name is Diamond-Chi, there are my friends, Sweet Dreams, Musical Star, Lightning Flash, Rainbow Flash and Heart Pencil." Diamond-Chi introduced.

"We are known as the "Spy Girls" around our world, you could see we don't belong here, we're not mutants either." Heart explained.

"We are from a school named Canterlot High." Lightning explained.

"*looks at them* So... what are your names?" Sweet asked.

The blue masked turtle walked over to the Spy Girls.

"My name is Leo, nice to meet all of you" Leo introduced himself.

"My name is Donnie, a pleasure to meet you" Donnie introduced himself.

"I'm Raph, nice to meet ya." Raph introduced himself.

"Mine's Mikey, it's great to have new friends." Mikey introduced himself excitedly.

"*looks at the mutant rat* What about you?" Heart asked.

Master Splinter doesn't answer.

"Oh Spli-" said Mikey before Raph covered his mouth.

"Shut up, Mikey!" Raph exclaimed.

"Mikey was supposed to reveal it, besides 'Splinter' doesn't mind" Donnie revealed.

"So your name is Splinter?" Diamond-Chi asked.

Master Splinter nods.

"So I wondered, how did all of you become mutants? Was it some sort of experiment or something?" Musical asked.

"It's pretty complicated...you want the origin of how we became who we are?" said Leo.

"Yep." said Lightning.

"Alright. Splinter told us that we were bought from a pet store and was a human, he had mutagen while he was at it. Creatures known as the "Kraang" disguised as humans, so when they found us. They attacked, and once they were attacked, the mutagen fell and smashed into pieces and mutagen was pouring out. Splinter and my brothers were affected by it. That's how we became who we are" Leo explained.

"Woah, so Splinter was a human and you guys were regular pet turtles bought from the pet store? Then got affected by the mutagen? Some kind of tragic past, really" Rainbow concluded.

"Yeah, it was on accident but it was a good one. We were all hidden trying to defeat Shredder and other foes" said Donnie.

"Shredder?" Sweet asked.

"Yeah, Shredder, he always 'tries' to find a way to get this world under control, also with the help of his daughter, known as April's foe, Karai" Raph revealed.

"Wow." Sweet kind of shocked.

"Um guys, we might have some company here" said Casey, looking at the Kraang.

Everyone looks at a lot of Kraang in the lair.

"What the?!" Musical yelled.

"The Kraang? H-How did they find us?" Lightning asked.

"You know them?" April asked.

"Yeah they're the ones who tried to do an experiment on me." Musical explained.

"More like tried to experiment on us." said Rainbow.

"They attacked us once we got sucked through here" said Heart.

"Actually their portal is what got us here in the first place." Diamond revealed.

"How do you know it was actually their portal?" Donnie asked.

"What I like to know is, how did they find us here?" Diamond asked.

"Cause they think you're humans, and you are, but not ORDINARY, as the ones we see here" Mikey explained.

"We know that, but, what she means is, how did they track us down?" Lightning asked.

"They must've tried to link to different worlds or dimensions, maybe that's how they found you" Donnie explained.

"What are we waiting for? We need to take the Kraang down!" said Raph, getting ready with his sais.

"My thoughts exactly." said Rainbow as everyone gets in a fighting stance.