Later that night, Leo was playing his flute on the balcony. King Splinter came to talk to him. "Leonardo? If I may say, far better than any dream girl is one loyal, caring, and so on and so forth and one right before your eyes." Splinter left and Leo thought about what he said, he saw Twilight through the window, but she didn't notice him looking. In frustration, he threw his flute in the ocean and when he was leaving, he heard a familiar sound. 

♫ Ah, ah, ah, ah ♫
♫ Ah, ah, ah ♫

♫ Ah, ah, ah, ah ♫
♫ Ah, ah, ah ♫

Leo looked down the balcony and saw a girl with black hair with bangs on each side, and back of her hair was cut but dyed blonde and she was dressed up like a ninja, wearing a gem necklace, walking on the beach and singing just like Twilight.

♫ La-da-da, la-da-di, ♫ 
♫ la-da-da, la-da-da ♫

Leo recognized this voice. It's the same voice he heard when he was rescued!

♫ La-da-di, la-da-da, ♫ 
♫ la-da-da-da-da ♫

Bright green swirls came out of her red gem pendant and went into Leo's eyes as his eyes glows green.

♫ La-da-di, la-da-da, ♫ 
♫ la-da-da ♫

"You're mine now, little turtle." A female voice said with an evil smirk before letting out an evil laughed as it echoes throughout the beach. Leo was now under the mysterious girl's spell.

In the morning, the SWAT Kats came flying in their jetpacks into Twilight's room while she was still sleeping. "Twilight, Twilight wake up! Wake up. We just heard the news." T-Bone jumped on the bed waking up Twilight, Spike, and the Mane 5.

"Congratulations, buddy, you did it!" He said while shaking the half awaken Twilight's hand. Starlight yawned. "What are you guys talking about?" Starlight said as she tried to get back to sleep. "As if you guys didn't know, the whole town's talking about the prince getting married this afternoon."

Twilight seemed a little surprised. "Anyway, we just came to wish you good luck." They walked outside. "See ya later. We wouldn't miss it!" They flew off the balcony. Twilight started to realize what they meant and got excited. She got up, hugged her friends. She ran downstairs still in her pajamas and the others followed her.

When she was on the upper staircase she looked down and saw Leo, his family and another girl talking. "Well now, Leonardo." King Splinter said a little embarrassed. "I guess I was mistaken. Your mystery girl does in faceted exist. And she is quite lovely."

The others caught up to Twilight still looking surprised and when they looked down, they were surprised as well. "Congratulations, my dear." He said shaking the girl's hand.

"We wish to be married as soon as possible, father." Leonardo said still in a trance. Twilight was in shock and shook her head in disbelief. "What? Sure but these things take time you know." "This afternoon, father, the wedding ship departs at sunset."

"Alright, Leonardo, if that's what you want." Spike, Starlight, Applejack, Fluttershy, Rarity, Pinkie Pie, and Rainbow Dash saw Twilight break into tears and run off crying, so they ran after her.

Karai also saw Twilight and snicker evilly to herself, she looked at the familiar gem necklace that still contained Twilight's voice and magic.

But she doesn't know that Raphael, Donatello, and Michelangelo saw her snickered evilly, and they knew that something is not right. Later in the afternoon, Twilight was wearing another outfit,

she sadly watched the wedding ship sail off. Twilight fell down and started sobbing. Starlight felt sad for her and she put her hoof on her shoulder, Spike, Starlight, and the mane 5 felt sad that Twilight was heartbroken.

On the ship, T-Bone and Razor are ready to attend the wedding, "Do you guys realized something is wrong with Leo's bride?" They saw Raphael, Donatello, and Michelangelo talking.

"Yeah, its like Leo was controlled by her." "What are you guys talking about?" The brothers saw T-bone and Razor, "AAAHHH! TALKING CATS!" Michelangelo yelled, "Oh sure; talking turtles are not strange like talking cats." T-Bone said annoyed.

"Point taken." Donatello said, "Anyway, what is it about your brother being controlled by his bride?" Razor ask, before they can answer, they heard singing, and it sounded a lot like Twilight.

Karai:
♫ What a lovely little bride I'll make, ♫ 
♫ My dear, I'll look divine! ♫

They all peeked through the door and saw Karai singing.

Karai:
♫ Things are working out according to my ultimate design! ♫

Karai slingshot a pin to an angel carving on the mirror, making Michelangelo to gulp deeply, but Donatello put his hand on his brother's shoulder to calm him down.

Karai:
♫ Soon we'll have that little alicorn, ♫
♫ and Equestria will be ours! ♫

Karai looked in the mirror and started laughing in the mirror, the reflection was Adagio. "Adagio Dazzle!?!?" The SWAT Kats said surprised. "Oh no, this is so bad! We gotta-" T-Bone was cut off by Raphael who was also surprised with Donatello and Michelangelo. "You guys know her?!"

"Yeah. Adagio and two other girls, Aria and Sonata are three evil sirens who used to live in another world called Equestria where we all lived, but they were banished to human world by Star swirl the bearded." T-Bone explains, "We got to stop her!" Razor said, "We'll help too." Raph said, "Well, come on!"

They grab the three brothers and they quickly flew out of the cruise. The SWAT kats yelled, "TWILIGHT! TWILIGHT!" Then they all landed next to Twilight, Starlight, and the others.

"Twilight! You won't believe it! We were getting ready for the wedding, 'cause we thought you and Leo were getting married. Then we overheard Leo's brothers, Raph, Donnie and Mikey, and-and Adagio was looking at the mirror and she was singing with your voice and using your magic to control Leo!" Razor yelled.

"Do you hear what we're telling you?! The prince is marrying the evil leader of the sirens in disguise!" T-Bone yelled while he held Pinkie Pie as he shook her, he put her down as her eyes were rolled because she got dizzy thanks to T-Bone and shook her head to get rid of the dizziness, Twilight couldn't believe it.

"Are you sure about this?" Starlight ask as she check on Pinkie to see if she's OK after the shaking from T-Bone, "Yes, are we ever wrong?" Razor said, "What are we gonna do?" Applejack asked.

Twilight stared at the ship sail away into the sunset and she remembered what Adagio said. Before the sun sets on the third day. Without a moment to lose, Twilight quickly jumped in the ocean.

Starlight uses her magic to tie a rope to the barrel into the water and put Twilight on it. "Rainbow, I need you and Fluttershy to take Twilight to that boat as fast as you can!" Starlight ordered as she used her magic to lift two ropes and tie them around Rainbow Dash's and Fluttershy's waists. "You got it, Starlight!" Rainbow Dash said as she and Fluttershy started pulling Twilight to the ship.

"Applejack, Rarity, Pinkie Pie and Spike, we need to go back to Equestria to warn Princess Celestia. She needs to know about this." Starlight said as she lift Spike and put him on her back and use her magic to make a portal to Equestria.

"Do you think Princess Luna and Princess Cadence might help too?" Applejack ask, "I hope so." Starlight said. "Starlight! What about us?!" T-Bone ask, "I need you guys to stop that wedding! At all cost!" Starlight said before she and the others went through the portal and the portal disappears.

"Stop the wedding? But how are we gonna do that?" Raphael ask, then Razor had an idea, he said, "I got an idea!" As the brothers and the SWAT kats gather around in a circle to listen to Razor's plan.

On the ship Leonardo and Karai were walking down the aisle. They walked past King Splinter, who had Chase on a leash due to his 'strange' behavior today. Chase growled at Karai, since he knew he couldn't trust her. Karai just kicked him in the face, making him whimpered and kept walking.

They reached the priest and he started "Dearly beloved." Meanwhile, Rainbow Dash and Fluttershy are still pulling Twilight to the ship. "Don't worry, Twilight, we're going to make it." Fluttershy said tiring out as she tiredly pull the barrel Twilight's on, "Hang on Twilight, We're almost there." Rainbow Dash said as she try to pull the barrel due to the fact that Fluttershy is tired.

"Do you, Leonardo, take Karai to be your lawfully wedded wife, for as long as you both shall live?" The priest continued. "I do." Leonardo answered.

Karai heard something coming, bunch of seagulls came swooping down on her and she ducked, she look up again and saw them swooping down to her again and she ducked again.

The SWAT kats, Raphael, Donatello, and Michelangelo appeared on the ship as sea creatures appeared on the ship and attacked Karai.

At the same time, Twilight just arrived on the ship and started climbing, "Raphael, Donatello, Michelangelo! What is the meaning of this?!" King Splinter ask his sons, "We got the answer; that girl is brain-washing Leo!" Raph yelled as he pointed at Karai who now being bounds up and down by seals and landed on the dessert table.

Twilight reached the ship top, and saw Karai covered in food and then got squirt with water by dolphins, T-Bone and Razor got into Karai's face and burped in her face. "Why you little-!" Karai yelled as she grab Razor and T-Bone tried to separate them as Razor grab the gem necklace Karai has around her neck.

King Splinter saw that Chase want to get Karai, so he unhook the leash off his collar and Chase ran toward Karai. Then, Chase bit her on her leg to get revenge for The SWAT kats and for kicking him in the face earlier.

Karai screamed and her necklace fell off and the gem cracked a little on the floor as Twilight's voice continued to vocalizing as it and her magic went up towards Twilight as Leonardo was out of his trance.

Everyone watches in shock while Karai watches in anger as Twilight's voice and magic went back to her and she finished vocalizing, she then realized she had her voice and magic back.

"Twilight!" Leo called to her, "Leo!" Twilight called back, Chase barked happily as he bounds happily. "You can talk. Your the one!" Leo said as he walked to her and held her hands.

"Leo, get away from her!" Karai said, realizing she had her old 'Adagio' voice back. "It was you all this time." Leo said. "Leo, I wanted to tell you..." "Leo, no!" Adagio shouted.

As they were about to kiss, Twilight felt pain around her body as she started to glow and slide down to the ground. "You're too late!" Adagio said.

The sun had already set and Twilight turned back to her alicorn self again. "YOUR TOO LATE!" Adagio laughed evilly as her gem necklace was put back together again, flew back to her and she put it back on.

She turned back to herself as a anthro siren form,

Aria and Sonata flew out of the water as their anthro siren forms as well.

Sonata grabbed Twilight with her magic and flew off the ship as Aria use her gem to make a portal to go back to Equestria. "So long, lover boy!" Adagio said as she, Aria, and Sonata went back to Equestria. "Twilight!" Leo yelled.

(A/N: I know Karai is the turtles' sister in the series, but just roll with it!)