Luna watched if Canterlot was safe in a tower. She couldn’t help noticing that the Changelings that were hitting the shield left. Well, that was a good thing. Luna couldn’t help but notice before she saw something flying from the window. She didn’t know what it was. But Luna knew it was a creature that tried to invade. Whoever threw the creature away did a good job, she even intended to please that it did. Suddenly, she heard the sound of a door opening and closing. She looked back and saw her sister, Spike, friends of Twilight, Cadence and Shining Armor. “Sister? Friends? Cadence? Shining? What happened?”

“Sister, you’re in danger,” replied Celestia.

Luna was confused and worried at the same time. “Me? In danger? But what am I in danger of?”

“It’s Nightmare Sparkle, Luna,” replied Celestia. “She went to Castle of the Two Sisters to decorate it, and then would come to you.”

Luna was confused. “Wait. Who is Nightmare Sparkle?”

“Nightmare Sparkle is Nightmare in Twilight’s body,” replied Celestia. “It’s kind of hard to explain.”

“But how did Twilight become that?” asked Luna. “What made her accept for Nightmare to take control of her body?”

Celestia got nervous. “It’s our fault, Luna”

“What do you mean it’s from all of you, Sister?” asked Luna.

“In the rehearsal, Twilight accused ‘Cadence’ of being evil just because she was acting differently,” Celestia replied.

Luna found it odd that Cadence was acting weird. “And you believed in her?”

“No, Luna. I was taken by her brother’s words.” Celestia was crying now.

“Sister, Twilight is your student,” said Luna. “If Twilight said that, it was because she felt something wasn’t right.”

“I know, Luna,” Celestia kept crying. “But I thought Cadence was like that because of stress.”

“Sister, don’t blame yourself,” said Luna. “You made a mistake, that’s all.”

“But it was my mistake that gave Nightmare the opportunity to take control of Twilight’s body,” said Celestia.

“But what do you want me to do, sister?” asked Luna. She wanted to do something to save her friend.

Celestia didn’t know what to do. “I don’t know, Luna. We came here before Nightmare Sparkle to warn you that she would come here to possibly talk to you.”

“I know that already, Sister,” said Luna. “But you want me to do what?”

Suddenly they heard the sound of a door opening. Everypony looked at the door and saw Nightmare Sparkle. Nightmare Sparkle smiled at the sight of Luna and approached. “Hi again, Luna.”

“Twilight?” asked Luna. “Is that you?”

“I’m not Twilight,” said Nightmare Sparkle. “I’m Nightmare Sparkle!”

“Twilight, you have to fight it,” said Luna.

“You’re so naive, Luna,” said Nightmare Sparkle. “Before I took control of your body you resisted me for a long time. You denied and denied my chances that I could use your body. Twilight was the opposite of you. She accepted on the spot, although it seems uncertain at first I managed to convince her until fast, and Twilight won’t be able to hear you, she’s watching everything in her mind while i’m controlling her body.”

“You will let Twilight go now. Or I will…” Luna was already prepared for her magic.

“Or what? Will you attack me?” asked Nightmare Sparkle. “She and me are the same. If you hurt me, you’ll be hurting Twilight too.”

Nightmare Sparkle’s words made Luna’s courage fade. She stopped using her magic. She didn’t want to hurt her first friend. What would Twilight think of her?

“Luna, don’t listen to what she says!” said Applejack.

“Yeah, Luna. This one doesn’t know who she’s getting into!” agreed Rainbow Dash.

Nightmare Sparkle smiled before laughing and saying, “Do you think I don’t know? Of course I do. You’re the five mares who tried to keep me from causing eternal night. The difference is that I was in Luna’s body and now I’m in Twilight’s body and she’s not with you five anymore”

Rainbow flew to Nightmare Sparkle. “We will free Twilight from your hooves. You will see!”

“Do you think I won’t be ready?” asked Nightmare Sparkle. “I have an army of Nightmare forces. Only they’re on the moon now, but that doesn’t stop me from calling them to bring them to Equestria.”

“Are you afraid of losing?” asked Rainbow Dash. “Because we will find a way to stop you. We’ve beaten you before and we can do it again.”

“How many times will I have to say?” asked Nightmare Sparkle, already starting to get impatient with the pegasus. “How will you use the Elements of Harmony without Twilight? She bearers the Element of Magic. And without her, the Elements won’t work.”

Rainbow Dash remembered that, but remained confident. She didn’t let Nightmare Sparkle keep her from confindece.

Nightmare Sparkle laughed at the reaction of the pegasus. “What happened? Can’t you accept the truth that you’ll never see Twilight again?”

Rainbow Dash got angry. She punched Nightmare Sparkle’s cheek, resulting in turning red. Nightmare Sparkle screamed before putting her right front hoof on her cheek. Nightmare Sparkle glared at Rainbow Dash, the pegasus realized what she it did, and smiled nervously. “That hurt, you know?”

“Er ... Sorry,” said Rainbow Dash.

Grumpy, Nightmare Sparkle took the hoof off her cheek, took Rainbow Dash, and used her magic. Everypony had to close and cover their eyes. When the glow stopped, they stopped covering and opened their eyes. They were surprised. Rainbow Dash has gone.

“What did you do to Dashie, Queen Mean?” asked Pinkie Pie in an unhappy way.

“I put her in the castle dungeons, pink pony,” replied Nightmare Sparkle.

“Get her out of the dungeon, bad queen!” shouted Pinkie Pie.

“I won’t do that,” said Nightmare Sparkle. “All of you will go to the dungeons.”

Nightmare Sparkle charged its magic and made a glow occur. Everypony and Spike in the room had to close their eyes because the glow was so strong. When the glow faded, the mares, princesses, and Shining Armor were no longer in place. Nightmare Sparkle smiled before walking again. “Now, I must return to my castle.”