It was a bright sunset around Equestria. The Mane 6 and Spike had arrived at the Crystal Empire.
"Hoo-wee! Your very first Princess Summit. You must be over the moon, Twilight!", Applejack cheers.
Twilight Sparkle answers Applejack, "Oh, I am excited, but, to be honest, I'm a little nervous too."
Pinkie Pie startles Twilight just gives her excitement.
"You're nervous-cited! It's like you want to jump up and down and yell, "YAY ME!", but you also want to curl up in a teeny tiny ball and hide at the same time.", corrected Pinkie Pie, pretending to jump up and down, and curl like a ball. She then returns to her original position. "We've all been there."
Fluttershy joins in, saying "I'm there almost every day."
"You've got no reason to fret, Twi. Everything's gonna be just-"
"TWILIGHT!", Rarity screamed, startling Twilight and their friends. "Oh sorry, girls. I just realized Twilight's not wearing her crown. You haven't forgotten it back at Ponyville, haven't you?"
"It's in my bag." Twilight answers, as we see Spike with Twilight's luggage.
She then concerns, "Just feel a little self-conscious about wearing it.", about her crown, and then about her new wings: "Haven't really gotten accustomed to these yet, either."
"You are a princess now, Twilight. Embrace it! I'm telling you, if I had a crown like that, I would never take it off. Why I'd sleep in the thing." Rarity suggests.
As the Mane 6 goes inside, there are several guards on their left and right on the carpet who are doing the horn fanfare, with the three princesses waiting.
Twilight bumps into one of the guards, who was different than the rest of the guards, saying: "Her highness, Princess Twilight Sparkle!"
As the group then comes to the end of the room to meet the three royal princesses, that's when they meet.
"Twilight! I haven't seen you since the coronation!" Cadence relieves, nuzzling her sister-in-law.
"We have so much to discuss. But it can wait until tomorrow. You all look tired from your journey.", greeted Celestia to the Mane 6 and Spike.
"Now, off to bed, all of you." Celestia told them in a kind way.
In Twilight's and Spike's bedroom, they were preparing for sleep, but Twilight, laments about something, sighing to get Spike's attention.
"What's wrong, Twilight?", Spike asks.
"I don't know, Spike, I'm just worried, I guess. Princess Cadence was given the Crystal Empire to rule over.", Twilight explains. "What if now that I'm a princess, Princess Celestia expects me to lead a kingdom of my own?"
"That would be awesome!", Spike suggests.
"No, it would not! " Twilight grumbled, walking around, continuing to explain. "Just because I have this crown and these wings, it doesn't mean I'll be a good leader."
"Now, come on. You should get some shut-eye. Big day tomorrow.", Spike finishes, while tucking Twilight to bed.
With Spike sleeping, he woke up suddenly due to Twilight's noises. They both see Twilight trying to get her wings calmed down.
"Can't...tuck! Just trying to get comfortable!", gritted Twilight, who finally got her wings calmed down.
Twilight groans in anger as the blanket falls back down on her. They came back down, back in their position.
HiT Entertainment & Hasbro Presents...
An AllSpark Pictures & ARC Productions Film...
My Little Pony + Thomas & Friends: Equestria Sodor Engines
Tara Strong as Twilight Sparkle
Ashleigh Ball as Applejack and Rainbow Dash
Andrea Libman as Pinkie Pie and Fluttershy
Tabitha St. Germain as Rarity
Casey Weseluck as Spike
Rebecca Shochiet as Sunset Shimmer
Joesph May as Thomas the Tank Engine
As the opening credits end, the camera pans down from the title back to the Crystal Empire.
Laster in the middle of the night in a room a light shined quick and then the door slightly opened and a hooded pony look at the guard and was about to get past him. The pony then continued until the pony made it to Twilight's room and when in quiet.
See the crown the pony used magic to get to replace it with another one that looked the same, but the pony almost knocked over the lamb, but luck used magic to catch it and put it back.
However, the pony trip over Spike and woke him.
"Huh?" Spike yawned, "What?"
Twilight then woke up, yawning to see her crown in the mystery pony clock.
"My crown! She's got my crown! Stop! Thief! She's stolen my crown!" Twilight yelled, getting up and chasing after her.
The pony ran, but Twilight when after as both passed the other room as they opened their doors, and gasped.
"Stop!" yelled Twilight teleporting in front of the pony, only for the pony to do the same and the clock to land on Twilight. She got it all her look to see a yellow-coated unicorn with a red and yellow striped mane and tail.
The unicorn against to run and made it back into the room she came from, but Twilight tackled her and the crown bounced around a bit fore going through a mirror. "What did you do with my crown?" demanded Twilight as her friends arrived.
The yellow unicorn grinned and said, "Sorry it had to be this way... Princess."
Then she when through the mirror too. All gasped and Fluttershy was the one to ask who she was.
"Who was that?" Fluttershy asked.
In the morning Celestia explained about it and who that mysterious pony was.
"Sunset Shimmer. A former student of mine. She began her studies with me not long before Twilight. But when she did not get what she wanted as quickly as she liked, she turned cruel and dishonest." Celestia explained, "I tried to help her, but she eventually decided to abandon her studies and pursue her own path. One that has sadly led to her stealing your crown."
"She replaced Twilight's with this one," said Spike holding up the fake crown as Celestia looked at it for a moment.
"I suppose Sunset Shimmer thought you wouldn't notice right away that this was not yours." Celesia said, "And by the time you did, it would be too late to go after your crown and Element of Harmony."
"But I don't understand. Where did she go? Why did she take the crown?" Twilight asked.
Celestia leads everyone out of the throne room.
"You'll soon know more about this place than even I do," Celestia informed.
Celestia then leads them in front of the mirror, where the other princess is. Princess Luna then explains about the mirror the crown and Sunset entered through.
"This is no ordinary mirror. It is a gateway to another world. A gateway that opens once a year" Luna said.
"Sparkly!" Pinkie giggled, as she touched the magic mirror.
Luna used his magic to move Pinkie away while rolling her eyes.
"It has always been kept in the throne room of Canterlot Castle, but when Princess Cadance took over the Crystal Empire, we sent it here for her to watch over," Luna explained.
"I had always hoped that Sunset Shimmer would someday use it to return, to come back to Equestria seeking my guidance." Celestria sighed, "Obviously, this is not what has happened."
"Twilight, you must use the mirror to go into this other world and retrieve your crown." Cadance said, "Without it, the other Elements of Harmony have no power, and Equestria is left without one of its most important means of defense," said Cadance.
"Your crown does not belong in the place Sunset Shimmer now calls home and in her possession, your Element of Harmony will no doubt be used to bring harm to the inhabitants of this other realm." Luna said, "They will don't know the power that the crowns have and must not know."
"You understand the importance of your task?" Celestia asked.
"Of course," said Twilight.
"Good, then you must go at once," said Celestia.
Twilight sighed and moved forward, but Rainbow Dash landed in front of her.
"Whoa, whoa, whoa! She's going, we're going with her." Rainbow said, with the others beside her and Pinkie squee. "Right girls?"
" Oooh! I'm so 'nervicited'!" Pinkie said with joy.
"You do realize that's not a real word, right?" Applejack said with skepticism.
"I'm afraid I can't let you go," said Celestia.
"What! Why not?" Rainbow asked, confused as the others were too.
"Sending all of you could upset the balance of this alternate world, creating havoc that would make it impossible for Twilight to get the crown back from Sunset Shimmer." Celestia explained, "This is something Princess Twilight must do alone,"
"Time is of the essence. On the third day, when the moon reaches its peak in the night sky, the gateway will close." Luna said. " And once it does, it will be another thirty moons before you will be able to use it to return."
Twilight nodded and understand and was lucky she had all the time too. She moved up and stop in front of the mirror looking at it. She put her hooves through first then moved into it. Spike, however, was scared and nervous and ran forward too into the mirror as the girls yelled.
"Spike, NO!" The mane 5 yelled.
The Twilight and Spike were in a colorful vortex as they were heading to this other world.