Sometime later, Sun and her friends have finish school for today, and are going to head back home. The only problem they have is that the new girls who Sun met before, is making everyone in the school fight with each other about the Musical Showcase. They are hoping that Principal Celestia can help them with their problem. As they walk down the hall to the office, they are having a little discussion along the way.
"I swear I never knew those girls are in some possession of some kind of dark magic, and it's the only explanation as to what happened back there," Sun explains
"Don't worry y'all, we'll tell Principal Celestia about this and those girls are hit to the corner. The last thing she needs is another person who got magic invading this school." Applejack says.
Sun sighs at the statement and says, "Falling Star is not like it if she hears that. Then again, I kind of blunt about the fact she turned into a she demon."
"And the last thing we need is another event being turned another magical fiasco," Rainbow Dash remarks.
After their conversation, they reach Principal Celestia's office. Luckily Vice Principal Luna is there as well, so they can talk to them. However, their plan to talk to them about the new girls is not going so well.
"Dark magic? I highly doubt it. I'm sure those new girls are not here to cause any trouble. And their idea for changing the event sounds like a good idea" Principal Celestia says in a firm tone.
"But… but… Principal Celestia," Pinkie stutters loudly.
"We're telling the truth! We saw everything going down in the cafeteria!" Rainbow Dash exclaims.
"She's right. As they sang, there was all this green mist, and their singing caused everything to argue with each other. And something about their pendants is helping them absorb this energy and making it stronger," Sun adds.
Then Rarity says, "We don't mind them singing in the showcase, and we love to hear their singing in the cafeteria and the Battle of the Bands does sound exciting, but we do appreciate if you can tell them to not use their magic in the showcase."
"We don't another event to have any magic surprises," Fluttershy adds.
Vice Principal Luna says, "We'll be sure to tell them that, but I still think you girls are just worried about the Dazzling beating you, or just thought you saw something odd in the cafeteria."
"The Dazzlings?" Applejack replies looking confused.
Then Principal Celestia explains, "It's the name of their music group. They came by my office earlier to sign up for the show case. They even sang a song to Vice Principal Luna and I."
"They did?" Applejack asks with suspicion.
"Yes, and we think of having a Battle of the Bands instead is a marvelous idea," Principal Celestia answers.
Just then Sun and the girls notice and Principal Celestia and Vice Principal Luna's eyes glow a bright green color. Since it's been confirm that the new girls call The Dazzling's have been in the office and sing them a song, it can only clarify that their own principals are now under their spell. They know that the problem is getting more serious each time. After their talk with their principals, they've gone outside to the Wondercolt Statue to talk about this magical dilemma that invaded their school.
"I can't believe they got to Principal Celestia and Vice Principal Luna too," Fluttershy sadly says as she holds a ladybug by her fingers.
"They got into everybody," Rainbow adds while kicking her soccer ball around.
On the statue Pinkie happily sings as she says, "Not everybody."
"Pinkie Pie's right. We were there when The Dazzlings were singing, and we weren't affected. It was like we were protected somehow," Applejack says and thinks about what happened.
"So let's take them down! It's not like we haven't take on dark magic and whoop their sorry but," Rainbow says with pride as sh play with her soccer ball.
"Falling Star is so not going to be able to let this down. I don't think I'm going to let it down either," Sun bluntly replies.
Rainbow laughs nervously and says, "Sorry about that."
"It's okay," Sun replies.
Then Sun makes a curious expression, scratches her head as she says, "Besides, I'm curious to know about The Dazzlings. In fact, if they are from Equestria, they don't seem to be ordinary ponies. They have these pendants on their necks all the time and their singing help give their pendants and magic more power."
Then Fluttershy says, "You're right. Twilight also knows about all this magic stuff besides you. And maybe the magic within us is what protecting us from The Dazzlings' spell, and it only comes out when we play music."
"I surely don't know how to use it to whoop anybody's butt," Fluttershy adds as she sees then lady bug flying away.
Rarity sighs as she paints her nails and says, "If only we can get a message to Twilight. Maybe she can help us figure out who The Dazzlings are and what to do about the spell they cast on our friends."
"We can use my journal for that, but what good would that do," Sun replies.
"She's right, the portal's closed," Rainbow says as she throws the ball towards the statue.
Rainbow catches the ball and says, "And I'm pretty sure they also don't have cell phones. Or any portal opener or something like that."
Sun takes the journal out of her backpack and says, "No, but we do have this."
"We'll just use this to explain to Twilight about The Dazzling and see if there's anyway she can help us," Sun adds as she turns the book to an empty page.
"It's worth a try," Applejack replies.
With that Sun grabs a pen from her back, and says in her thought as she begins to write her message, "Dear Twilight…"
Meanwhile, back in Equestria, everyone at Ponyville are going on with their everyday lives. Over a small hill, there is a purple crystal like castle, and it shines like a cave full of gems. In the castle throne room, Twilight and her friends are arranging the stuff and putting them in their belongings. Twilight and her friends are very pleased to have the castle just outside of Ponyville, and it's kind of a mystery to them as well.
"I have to say, your castle is looking marvelous," Rarity says as she polishes one of the thrones.
"I have to agree. Though, it's still going to take time to get used to," Twilight replies.
"Don't worry, you got a pretty sweet castle and, we get to help you with your official title now," Rainbow adds.
Twilight smiles and she has to admit, the castle is pretty, and cool, but it also mysterious. Just then she and her friends hear a knock on the door.
"Who can that be?" Spike asks.
Not sure who it is, Twilight walks over to the door and uses her magic to open it. When she opens it, she gasps in excitement, to see that a familiar pony is here to visit.
"Falling Star!" Twilight happily screams.
"Hey Twilight," Falling Star replies with a smile.
Twilight and Falling Star give each other a simple hug. Then Twilight escort Falling Star into the throne room. The girls give a wave to Falling Star as they continue to do their own activity.
"It's so good to see you again, what are you doing here?" Twilight asks with glee.
"Well, I thought it will be a good idea to pay you a visit, and Princess Celestia asked me to give you this," Falling Star answers, as she levitates a book to her.
Twilight takes the book with her magic, and is surprised to see that it's the same book that is used to contact Sun.
"The journal we used to contact Sun?" Spike questionably replies.
Then Falling Star explains, "Yes. She thought is will be a good idea for you to have it, and since I told her I was going to visit you anyway, she asked me to deliver it for you."
Twilight puts the book on her throne with a smile and says, "Thanks."
Then Twilight asks, "Since you're here, do you want to explore around Ponyville."
"Sure," Falling Star answers with a smile.
Just then a strange vibrating noise is surrounding the room.
Pinkie looks to see the source of the noise and questionably says, "Uh Twilight, the book is vibrating again?"
The girls looks a bit confused to see the journal vibrating and glowing. Twilight levitates it to her and opens the book. She then look to see the message Sun is leaving to her.
"That must be Sun," Twilight says.
"According to what Sun said, she and her friends are having a showcase this weekend, but they ran into trouble," Twilight explains.
"What do you mean?" Rainbow asks.
Twilight takes a good look as the message and says with concern, "What I mean is… is that Sun and the girls need my help."
After looking through the shelves, Twilight finds the book she needs. Thanks to Sun's description, she can tell what kind of trouble she and her friends are facing at this time.
"The way Sun described them, I'm afraid these new girls sound an awful like… the sirens," Twilight says as she levitates a book to the table where the girls and Spike are.
Then Pinkie scaredly screams, "Not the sirens!"
"I don't exactly know what that is," Pinkie whispers to Fluttershy.
Twilight uses her magic to open the book and explains, "The sirens were three beautiful, but dangerous creatures who had the power to charm ponies with their music, but to maintain this power they had to feed of the negativity and distrust of others. The more of the negative energy they consume the strong their voices became, and the farther they can spread their dark magic."
"I don't think I like this story very much," Fluttershy says in a scared tone.
"Me too, so, what happened?" Falling Star asks looking a bit nervous.
"If the sirens had their way they would have divided and conquered all of Equestria, but a certain Star Swirl the Bearded wasn't having it. Rumor has it, he found a way to banish them to another world, one where he believed their magic power would be lost," Twilight adds.
Then Falling Star says in a worried expression, "That world must have been the one where Sun and her friends lived."
"But Starswirl must have sent them there ages ago. How come they're surfacing now?" Applejack asks.
"I don't know. But if my hunch is right, and it is the sirens who come to Canterlot High, this spell they cast is just the beginning," Twilight replies as she turn the page to the pictures of the sirens.
"But how are Sun and her friends are immune to the sirens' spell?" Falling Star asks.
Twilight says while thinking, "That is something I like to see, but I need to get back there and help stop the sirens."
But Rainbow lands on the ground and says, "Uh, I hate to burst your bubble, Twilight, but the connection between Sun's home and Equestria will still be totally cut off for over another two years."
But Pinkie comes between the girls and spaz out, "Okay, first off, if there was bubble blowing going on, why wasn't I told about it? And second, if the connection is totally cut off, how was able about to get a message to Princess Celestia, Twilight and us all this time she lived in the other world."
Just then Twilight gasps with a smile and says, "Pinkie, you're genius!"
"Yeah. I get that alot," Pinkie says with a smile.
She then drags Rainbow to the face and firmly asks, "Now, about those bubbles?"
Just then Twilight starts to gather a bunch of pipes, wires, and other kind of equipments. The girls are wonder what Twilight is up to, and what she is doing to the mirror in the library. After a few hours, Twilight has finished with her protect, and explain what her invention is supposed to do.
Twilight addly explains, " ...And the interval between the two points is defined as the square root of the sum of the squares of the separation between the points along three spatial dimensions."
Everypony else are looking confused and not sure what Twilight is saying
"Say what now?" Spike asks looking confused.
"Duh! She's gonna take the magic in here and put it in there. That'll make the portal open up so that whenever she wants to, she can go from here to there. There to here. Here to there. Here there! Here there! Here… " Pinkie explains as she goes around the portal and the book back and forth.
Applejack stops her in her tracks and says, "We get the idea!"
"Now to see if it actually works," Twilight replies.
She then levitates Princess Celestia's book on the stand on top of the mirror. Then the magic from the book start up the machine, and reaches to each part until it able to put the magic inside the mirror. With that, the mirror is open now and can be open at any time Twilight needs to head back to Canterlot High. The girls are amazed to see this, and think it looks pretty cool to see.
Then Applejack asks, "Don't suppose we could join you this time around?"
"Better not. It could make things pretty confusing if Canterlot High all of a sudden had two of all of you," Twilight answers, and explains.
Applejack and the others agree to it. They remember meeting their counterparts a while back, and they don't want to make any confusing for anyone who end up seeing two of each of them
Then Spike asks, "But I still get to go, right? There isn't another one of me at Canterlot High. And you never know if you might need your trusty assistant."
"Mm hmm," Twilight says while nodding her head.
"Yes!" Spike exclaims in excitement.
Then Falling Star declares, "Well, I'm coming to."
"What?!" The girls and Spike say with a shock.
Then Twilight asks, "Falling Star, are you sure about this?"
"Yes. I'm sure of it. Sun helped me when I gone down a bad road, now it's my turn to help you and her," Falling Star answers, and explains her reason.
Hearing this, Twilight nods her head and says, "Okay, you can come, but make sure to stay close, you haven't been to Canterlot High is a while."
"You bet," Falling Star replies.
Twilight turns to her friends and says, "We won't be gone long."
Twilight's friends hug her, Falling Star, and Spike to wish to them good luck. With that, Twilight, Falling Star, and Spike are getting ready to leave.
"Ready, guys?" Twilight asks.
"Ready!" Spike answers.
"Ready as I'll ever be," Falling Star says with a smile.
At that moment, Twilight, Falling Star, and Spike run through the portal to Canterlot High to help them with their situation. Back at Canterlot High, Sun and her friends are doing what they can to keep themselves entertained, doing each other's hair, painting their nails, and playing ball. Applejack and Pinkie are playing cards. Of course, Pinkie manages to win the game a few times.
Rainbow signs indisapontments and says, "I'm starting to think she's not coming."
Her answers had been proven wrong then three beings fly out of the portal, it can only mean that Twilight and Spike are back
"Twilight!" The girls cheer with excitement.
Twilight is able to sit up and says, "Oof. I'm back, and I brought two friends for the ride."
The girls are looking a bit confused about it at first. They can see twilight and Spike are here, and they notice someone else is with her.
Sun recognize her right away and asks, "Falling Star? Is that you?"
"Yep. It's me," Falling Star sheepishly smiles.
Sun simply smiles and help both of the girls up. The other gather around Twilight, Spike,and Falling Star happy to see them again. Sun hugs Twilight and then Falling Star.
She then asks Falling Star, "It's so good to see you again. What are you doing here?"
"I'm here to help you with the problem here," Falling Star answers.
"Yes, and we've got some bad news about those new girls," Twilight adds with concen.
The girls look at Twilight with a concern and worried look on their faces. They can tell that she has found something alright, and it's serious.
Sun starts to feel worried and asks, "I know that look Twilight. What is is you found out about them?"
With that, Twilight and Falling Star suggests to go to somewhere where they can talk about this. They suggest Sugarcube Corner to get a bite to eat, talk about their problem. They hope they know a way to fix this.