[Twilight has determined that the thief is a unicorn wearing false eyelashes, per evidence found]
Twilight
Has anypony else noticed that Rarity is wearing her hair rather differently today?
[gasps] What? Is it a crime to change one's style every now and again? Why, I think it's a crime not to.
Twilight
Really? [uses magic to lift the hair covering Rarity's left eye, revealing a missing eyelash]
Fine, I'm guilty! I wear false eyelashes!! [pauses] ...Oh, and I took a bite of the cake.
[The Mane 6 gather around a stunned Twilight]
Your brother's getting married? Congratulations, Twilight! That's great news!
Twilight
Yeah, great news. That I just got from a wedding invitation! Not from my brother, but from a piece of paper! Thanks a lot, Shining Armor. I mean, really, he couldn't tell me personally? [sarcastically and mockingly, using a sandwich as a puppet] "Hey, Twilight, just thought you should know I'm making a really big decision that changes everything. Oh, nevermind, you'll hear about it when you get the invitation." [own voice, snarky] Princess Mi Amore Cadenza? Who in the hoof is that?! [snorts]
Twily, "Princess Mi Amore Cadenza" is Cadance, your old foalsitter.
Twilight
Cadance?! As in THE Cadance?!? As in, the greatest foalsitter in the history of foalsitters!!??!!
Heh... you tell me, she was your foalsitter.
Twilight
Shining Armor's in real trouble! You have to help-
[The rest of the ponies continue chattering. Twilight notices their outfits]
Twilight
Dresses? What are you..?!
Can you believe it? We're gonna be Princess Mi Amore Cadenza's new bridesmaids!
Twilight
"New" bridesmaids? What happened to her old bridesmaids?
She didn't say. But she did tell us that she would love, love, love it if we'd fill in for them.
Twilight
And I'm sure it's the result of being an awful pony who doesn't deserve to even know Shining Armor let alone marry him!
Think maybe you're being just a tiny bit possessive of your brother?
RMRest of main cast
Uh-huh.
Twilight
I am not being possessive, and I am NOT taking it out on Cadance! You're all just too caught up in your wedding planning to notice that maybe there shouldn't even [pounds hoof on table] be a wedding!
You want to know why my eyes went all- [rolls eyes, followed by a grunt of pain] Because ever since I started having to perform my protection spell, I've been getting terrible migraines. Cadance hasn't been casting spells on me. She's been using her magic to heal me!
Twilight
[inhales]
And she decided to replace her bridesmaids because she found out the only reason they wanted to be in the wedding was so that they could meet Canterlot royalty! And if she hasn't been on her best behavior with your [stomps hoof] friends, it's because with me being so busy, she's had to make all the decisions about the wedding!
Twilight
I was just trying to–
She's been completely stressed out because it's really important to her that her big day be perfect! Something that obviously wasn't important to you. [Twilight gasps] Now if you'll excuse me, I have to go and comfort my bride. And you can forget about being my best mare. In fact, if I were you, I wouldn't show up to the wedding at all.
C'mon, y'all. Let's go check on the princess.
[The rest of Twilight's friends; including Spike, leave her]
Twilight
I was-
[coldly yet sternly] You have a lot to think about.
[The wedding hall doors slam, leaving Twilight alone]
Twilight
[left alone after she drove off Cadance, Shining Armor, her friends and Princess Celestia by claiming Cadance was evil] Maybe I was too overprotective [of Shining Armor]. I could have gained a sister; but instead, I just lost a brother. [after singing a reprise of "BBBFF", "Cadance" comes back, and strokes Twilight's hair] I'm sorry.
FPFake Princess Cadance
[eyes flash green] You WILL be! [sends Twilight sinking down into the mines of the castle, while smirking evily and walks off]
I-I don't understand. How can there be two of 'em?
She's a changeling! She takes the form of somepony you love and gains power by feeding off your love for them!
["Cadance" disposes her disguise and transforms into Chrysalis, Queen of the Changelings.]
[laughing] Right you are, Princess. And as queen of the changelings, it is up to me to find food for my subjects. Equestria has more love than any place I've ever encountered. My fellow changelings will be able to devour so much of it that we will gain more power than we have ever dreamed of!
They'll never get the chance! Shining Armor's protection spell will keep them from ever even reaching us!
[chuckling] Oh, I doubt that. Isn't that right, dear?
Ah, ah, ah. Don't want to go back to the caves now, do you? Ever since I took your place, I've been feeding off Shining Armor's love for you. Every moment he grows weaker and so does his spell. Even now, my minions are chipping away at it.
[laughing] He may not be my husband, but he is under my total control now.
TSTwilight Sparkle and Princess Cadance
[both gasps]
And, I'm sorry to say, unable to perform his duties as captain of the Royal Guard.
Soon, my changeling army will break through. First, we take Canterlot. And then, all of Equestria!
No. You won't. You may have made it impossible for Shining Armor to perform his spell, but now that you have so foolishly revealed your true self, I can protect my subjects from you!
[Princess Celestia and Queen Chrysalis engage in a beam battle. Queen Chrysalis ends up winning and Princess Celestia lands on the floor, her horn burnt and her crown loose. The wedding audience gasps in horror.]
[Twilight runs to her. Her friends follow her.]
Ah! Shining Armor's love for you is even stronger than I thought! Consuming it has made me even more powerful than Celestia!
The Elements of Harmony. You must get to them, and use their power to defeat the queen.
TPTwilight, Pinkie, Fluttershy, Rainbow and Applejack
Rarity!
[laughing] You can run, but you can't hide!
Part 1
Twilight
Let's go through this one more time
We've been over it like 1,000,000 times, Twilight! We've found all 6 keys, defeated Tirek, and got this sweet castle. End of story.
Twilight
Yes, but why?
I dunno, Sugarcube. Maybe it's just your new house and there ain't nothing more to it than that.
And here is the Staff of Sameness. It was one of the great mage Meadowbrook's nine enchanted items. We are incredibly fortunate to have it here. This is the tool that allows us to free ourselves from our marks! I'm curious – how did the subject of the vault come up?
Oh, some ponies were telling us how much they missed their cutie marks, and—
Twilight
Pinkie!
[gasps] Were they? Well, it seems you inspire all sorts of free thinking, don't you?
[laughs nervously] Well, w-we certainly didn't intend to cause any disruptions to your charming little—
Good. Let's just make sure of that, shall we?
[the creepy ponies all surround the Mane 6]
Twilight
It's a trap!
[after Starlight painfully takes their cutie marks away, Starlight gloats at Twilight]
Aw. I don't blame you for what you tried to do here today. You've spent your whole lives thinking those marks are a good thing.
Twilight
Give them back!
Well, now you can spend the rest of your lives here with us! And we'll teach you just how much better life can be without your cutie marks!
[After the Mane 6 get their cutie marks back, Starlight is about to attack Party Favor, Sugar Belle, Night Glider, and Double Diamond, but Twilight deflects her magic]
Wh– I studied that spell for years! How can you—
Twilight
I studied magic for years too! But what I didn't know then was that studying could only take me so far. Each of my friends has taught me something different about myself. It was their unique gifts and passions and personalities that helped bring out the magic inside of me. I never would have learned that I represent the element of magic without these five, and I certainly wouldn't be here to stop you now!
Spare me your sentimental nonsense! I gave these ponies real friendships they never could've had otherwise!
DDDouble Diamond
How do you know that?! You never even gave us a chance!
[Starlight uses her magic to escape them and goes into hiding in a cave.]
DDDouble Diamond
We'll never find her in there!
Twilight
We just have to hope that when she's had a chance to think it over, she realizes that you all have taught her something.
Twilight
Huh?! I'm pancake! I mean, awake...
Uh, Twilight? Is there something you wanna tell us
You know how much we appreciate all you do for us, and we simply adore having you around... But... We worry you might be... Ahem... Avoiding something else.
Twilight
Oh, has it been that obvious? I've been... The thing is... I know it's silly, but I... I've been avoiding... This place.
Why in Equestria would you want to avoid such a gorgeous castle?
Yeah! This place has everything! Big tall ceilings that make you feel tiny...shiny new floors that are cold to the touch...brrr! And it even has loooooong empty HALLWAYS!
["Hallways" echos out]
Twilight Sorry, Princess Celestia. I-I thought I could give you a break tonight. But it turns out I was in over my head.
(overjoyed) You have nothing to apologize for, this has been the most fun Gala in years!!
Twilight
(oblivious) I know. It was a— (realizing) —WHAT?!! But...there was ooze all over the place, a-and one of the guests threatened to send somepony to another dimension!
I know. Can you imagine how dull it would have been if I hadn't invited Discord? (She pushes Twilight with her) Come on! Ho! The night is still young! (giggles)