Trapped in Gravity Falls

by Eclipse208

Rating: everyone
Tags: Discord, My Little Pony: Friendship is Magic, Romance, Princess Luna, Adventure, Princess Celestia, Crossover
Length: 4905

When Discord takes over and sends Celestia and Luna to Gravity Falls, how can Dipper and Mabel help them?

Discord decides to take revenge by taking over Equestria and sends Princess Celestia and Princess Luna to Gravity Falls where they become human girls. They meet Dipper and Mable Pines and ask for help to get back to save their home.

Published 2014-09-05 23:10:04 UTC
Last updated 2014-09-05 23:10:04 UTC

Chapter 1

Celestia's POV.

I woke up in my bed as usual, and slipped on my golden shoes, necklace and crown. I got up to raise the sun and then went down to the dining room for breakfast. As I sat down, Luna trotted in with a worried look on her face, her dark blue hair flowing behind her. "Sister, i am worried" she said quietly, her blue eyes filled with worry.
"What seems to be the problem Luna" I asked her. Suddenly i heard a familiar laugh and saw a devilish smile appear behind my sister.
"Shall I tell you dear Princess?" he said with a chuckle as he flew high above us.
"Discord what are you up too?" Luna shouted. She ran towards me and Discord came closer. I stood up and went in front to protect Luna.
"Oh you know. I just wanted to take over Equestria" he said. The furniture started to float and the castle walls started to crumble.
The last thing i heard was a scream from my sister, and then everything went black.

Dipper's POV.

"Dipper I'm so bored" my twin complained and she fell onto her dusty bed.
"Mabel we've only been here a week and your already bored" I said as I sat on the bed. I still cant believe are parents made us stay the summer with our Gruncle Stan at his tourist trap, The Mystery Shack.
"Look in that journal of yours so we can go find a monster or something" she said flicking my hat off my head.
"Hey, stop doing that" I said. I went up to the window and saw a bright light in the sky and two objects falling from it.
"Mabel look outside" I shouted pointing at the light whilst I got my book out.
"Lets go see what it is" and before I could say no, she grabbed my arm and we ran out the door.

Luna's POV.

The last thing I saw was Tia trying to scream, then everything went black. I woke up and saw pine trees towering above me. The fresh, warm air welcomed me but then I heard a moan come from beside me. I turned to see a creature, that had the same flowing hair as my sister. "Celestia?" I asked puzzled. The creature got up and then fell again.
"Luna? Is that you?" it asked looking at me. Then I saw the same pink, kind eyes that my sister had and I realized that it was her.
"Tia what are we? Where are we?" I asked trying to get up.
"I think that we are humans dear sister and I don't know" she said looking around. Her skin was tanned and she was wearing a long white dress with a sun around her neck. She wasn't wearing any shoes and her wings and horn were missing.
Then I looked at myself. I was wearing a similar dress to Tia, but is was dark blue and my skin was very pale. My feet were cold due to the lack of shoes and my magic wasn't working because my horn was missing. I still had my flowing main that swirled around me.
"Why would Discord do this? I thought he was reformed," she said with a hint of sorrow in her voice. Suddenly we heard voices.
"Luna. Hide in this bush" Tia whispered, but we weren't quick enough.

Mabel's POV.

I shoved Dipper into the golf cart and shouted at him to follow the light. He weaved through the pine trees until the cart was to big, so we left it, and walked the rest of the way. "I think it fell over here" Dipper said as he pointed to some broken branches. I heard some mumbling, and someone whispering.
"Ah ha" I shouted as I jumped out. There were two girls there. One looked twelve and the other one looked around thirteen. The weird thing about them was the younger one had dark blue flowing hair that looked like the night sky. The other one had green, blue and pink hair that also flowed. "Luna stay back" the older one said to the younger one.
"Hi my name's Mabel and this is my brother, Dipper" I said pointing to him. "Were twins".
"Should we trust them Tia?" the young one said. The older one stepped forward.
"Hello there. I am Princess Celestia and this is my younger sister Princess Luna" she said pointing towards the girl on the floor.
"Your Princesses!" I said amazed. Dipper stood there flicking through his book.
"What are you?" he asked.

Chapter 2

Luna's POV.

"We are alicorns" I said. They looked at us like we were speaking a different language.
"What are alicorns?" they both asked. Really, they didn't know what an alicorn was.
"A alicorn is a pony with the ability to fly and the ability to use magic" my sister explained. I didn't know if I could trust them. But Tia did, and if Tia does, I do to. "So your pony's?" Mabel asked with a smile on her face.
"Yes. Yes we are" I said looking at my sister.
"Luna its getting dark, you need to raise the moon" Celestia said to me.
"But I don't have my horn or wings" I told her. It saddened me to think that I wouldn't be able to carry out my duties as princess of the night.
"Try Luna. I'll try to lower the sun, and if i can do it, so can you" Tia said reassuringly. The twins faces looked confused but then they focused on my sister. She stood there for a while, concentrating and then she flew up into the air and her necklace started to glow. Then the sun began to slowly set. She landed on the ground and looked at me.
"How did you do that?" Dipper asked surprised.
"Oh silly me, I forgot to tell you. I raise and set the sun and Luna here raises and sets the moon," she said smiling. "Although I don't know how I did it without my wings and horn".
I can do this I thought to myself. I concentrated and flew into the air. I pictured the moon rising and when i opened my eyes, my necklace was glowing blue and the moon was rising. I flew down and hugged my sister. It felt like I had got my cutie mark again.
"WOW! That was amazing!" Mabel shouted. She ran up to me and hugged me.
"Mabel we need to get home" Dipper said with a worried look on his face.
"Luna where are we going to stay tonight?" Tia said.

Dipper's POV.

"You can stay with us at The Mystery Shack" Mabel said waving her hands.
"I don't know if Gruncle Stan will let them," I said. Luna and Celestia looked upset. I cant just leave them hear anyway. "But I guess we can ask him" I said. All three of there faces lit up and we started to walk home. Mabel was talking to Celestia and Luna hung back with me. "So your from where?" I asked.
"I am from Equestria. Another world" she said. Her eyes started to water.
"Hey don't cry" I said trying to comfort her.
"I'm sorry. It's just that, I though that Discord was reformed, yet he took over and sent us here". By now tears were falling from her eyes. "Who's Discord?" I asked.
"The lord of chaos" she said wiping the tears away.
"But you wouldn't have met us, right?" I said looking at her. Her hair blended into the night sky. Her eyes were glowing and she actually looked quiet cute. Wait what!
"Thanks Dipper" she said. Then she hugged me!
"For what?" I asked, still in shock.
"For making me feel better and giving us a home" and with that she ran off to her sister.

Time Skip 4 Hour

Celestia's POV.

I still can't believe that we were able to stay with them. Gruncle Stan said we could stay as long as Mabel and Dipper pay for are food and other needs. Me and Luna were sleeping on blankets between the twins beds. Just before I went to sleep, Luna whispered to me "can I talk to you in your dreams?" she whispered.
"Ok" I said and then I fell asleep.

In Celestia's Dream

"What did you want to talk about Luna?" I asked. I heard some footsteps and turned to see her standing there.
"Do you think that Discord would hurt anypony?" she asked with a worried tone.
"No. Although he is evil, he wouldn't hurt anypony" I said reassuring her.
"Ok. And how will we get home?" she said with tears in her eyes.
"I don't know but I know that Dipper and Mabel will help us" I said hugging her. And with that I woke up.

Chapter 3

Mabel's POV.

"Do you have any other powers?" I asked Luna. We walking back to the shack from the diner. Luna didn't want anyone to see her hair, so I gave her a blue jacket to go over her and some of my shoes. She had to keep tucking her hair in the hood, as it kept falling out.
"Well, I don't know if I can do it now but I could do teleportation spells and preform spells for specific reasons" she said.
"That is so cool" I said excitedly. But then I saw Pacifica Northwest and her minions walking towards us. Long blonde hair and a light blue shirt with a purple jacket on top. She had black leggings on and purple shoes. Oh god I thought.
"Hi Mabel. Got another dork to be your friend" she said and her friends laughing behind her.
"Mabel who is this" Luna said shyly holding her hood over her face. I looked at her then looked at Pacifica.
"Luna, meet Pacifica. A mean, snobby, unkind girl. And those are her minions" I said, pointing at her.
She gave a death cold stare, and said "Luna. That's a weird name. And why are you covering your hair like that" she said as she pulled Luna's hood back letting her hair flow freely. They jumped back as Luna screamed.
"What is up with your hair. It's blue, sparkly and flowing. Stay away from us you freak" she said as she quickly walked off. Luna suddenly broke down in tears, pulled the hood back over her head and ran off.
"Luna!" I shouted and ran after her.

Luna's POV.

She is right. I am freak. No one back home understands the night. There all still afraid of me. "Luna!" Mable shouted.
"They are right. I don't belong here" I said, wiping away my tears. "Everyone back home is afraid of me. Afraid of Nightmare Moon" I said whilst shivering at the thought.
"Who is Nightmare Moon?" Mabel asked puzzled
"When I was younger, I was jealous of my sister. Everypony loved her day but hated my night. A spirit saw my jealousy, and took over me. That's when I turned into Nightmare Moon. I vowed to make the night last forever. But I was defeated and the spirit destroyed" I said remembering all the ponies I had hurt.
"Wow. I am so sorry" she said hugging me.
"Mabel, can I ask you something?" I said looking at her.
"Shore. Fire away" she said.
"Does Dipper have a girlfriend?" I asked blushing.
"No he doesn't. Why do you like him?" she said with a smile.
"Well I... what I'm trying to say is... yes I think I do".

Celestia's POV.

"Quick run!" I screamed. How did a peaceful walk turn into us running from gnomes of all things! Me and Dipper were just walking through the woods, talking about my home when a bunch of gnomes burst out and shouted "this is for taking our queen". Then they joined together and formed a massive monster! Now I'm running for my life. The shack was in site and so was Luna and Mabel. We ran into the clearing and before I could say anything, the monster jumped and grabbed Dipper. Luna and Mabel stood and Luna screamed in horror.
"Help me!" he shouted. At the same second, Luna jumped up and blasted the monster with energy coming from her hands. Suddenly, the monster exploded and it was raining gnomes. But Dipper luckily fell into Luna's arms.
"How did you do that?" Dipper asked, still in shock.
"I don't know. I felt so angry at the monster thing, and hit it" she said letting him down.
"I think that we should celebrate with cake and a episode of duck-tective!" Mabel screamed. And as we walked inside, she gave Luna a smile, so they were up to something. I just need to find out what.

Chapter 4

Dipper's POV.

I still can't believe what Luna did. She saved me from a gnome monster! I can't stop thanking her. But I think that she's getting annoyed, because I said thank you for the tenth time and she gave me a glare. So I think I'll stop.
"Dipper" I heard Celestia say. She had come back in from setting the sun. I still can't believe that no one has noticed them yet.
"Yeah. I'm in the kitchen" I said, standing up. She walked in and gave me a serious look.
"Mable and Luna are up too something" she said looking around.
"There both outside and why do you think that" I said confused.
"Well they have been whispering and smiling at each other" she said. She looked at my as if I was supposed to know the answer.
"What should I do?" I asked puzzled.
"Well, your Mabel's twin. Talk to her" she said.
I sighed and went outside to go talk to her. Luna walked past and smiled at me. I smiled back and felt a strange feeling inside of me. Weird. I saw Mabel playing with Waddles, her pet pig, and went over to talk to her.
"Hey bro. What's up?" she said, whilst hugging the pig.
"Why do you and Luna keep on smiling at each other like that?" I asked as she stood up.
"You won't tell Luna I tolled you?" she said smiling.
"Please tell me" I pleaded.
"Ok. Well Luna sorta has a crush on you" she said, now smiling as much as the joker.
"SHE WHAT!"

Luna's POV.

I can't believe Mabel! I thought she was my friend. I know I shouldn't of hid behind a tree, but she shouldn't have told Dipper that I had a crush on him. It makes me feel betrayed.
"AAAAAAAGGGGHHHHHH". Oh my. Why did I just shout that.
"Luna" they both said at the same time. They both stared at me and suddenly I just burst out crying and ran off. I ran as fast as I could until I found a cave. I walked in and sat on the ground. I looked up and saw thousands of gems and crystals on the ceiling, glittering from the moon light coming in from the entrance. They reminded me of one of Twilights friends called Rarity.
"Luna?" I heard a voice from outside say.
"Go away!" I said wiping away my tears.
"Luna it's me Tia" the voice said. "I saw what happened. Why did you scream?" she said sitting by me.
"Why did Mabel tell Dipper that I liked him?" I said looking into her pink eyes.
"I asked him to. I saw you two acting weird, so I asked him to see what was going on" she said holding me.
"But that gives her no right to tell him that I like him" I said.
"Well maybe she just wanted to help you" she said, twirling my hair. Suddenly a voice came from behind us.
"Mind if I speak to you?" it said. It was Dipper.
"I will leave you two alone". And with that, Celestia got up and left. This is awkward. He came and sat by me. I just looked away from him.
"So you like me?" he said to me.
"Um...well yeah. I'm sorry". Now I'm looking at my feet. They are bruised from me running here.
"Why are you sorry?" he said. His eyes were shining in the night and we were six inches away from each other.
"For all of this" I said quietly.
"Well just so you know" he said holding my hands, "I like you too". And that's when it happened. He kissed me! On the lips! I felt like I was flying. We walked back to the shack hand in hand.

Time skip 1 hour

Mabel's POV.

I feel horrible. I shouldn't have told Dipper. And now I have lost one of my best friends.
"Mabel?" a voice from behind me said. "It's me Luna".
I instantly stood up and hugged her. Then I noticed her and Dipper were holdings hands!
"I'm so sorry" I said letting go of her.
"It's ok" she said smiling at Dipper.
"So are you two together?" I said. Please say yes, please say yes.
"Yes. Yes we are" Dipper said hugging her.

Chapter 5

Celstia's POV.

Why did Luna fall in love. I'm happy for her, but she will be heart broken when we have to go back to stop Discord. I fear for my subjects. I hope that Twilight and her friends have been able to get the elements.
"Celestia?" I heard a voice say. I had been sitting in the cave that Luna had found. It was so pretty.
"Yes?". I turned around and saw Dipper standing there.
"I think I might have found a way to get you home" he said whilst frowning.
"Oh. Ok. Well what is it?" I said standing up.
"Well my book says that there is a portal hidden in the middle of the forest" he said as he pointed to a picture of a giant crystal.
"We must find it straight away" I said walking towards the entrance.
"Can't you just stay for a little longer" he said. I feel horrible doing this. But we need to go.
"Dipper, we have a entire kingdom to rule and right now, it has been taken over. I'm sorry" I said as I put my hand on his shoulder.
"Ok. I'm sorry" he said as he walked out. Just outside I heard him cry. I had no choice. One boy, or a entire kingdom of ponies who rely on me.

Time skip 1 hour

We were all watching duck-tective. Luna still didn't know that we had to go. Dipper wanted to tell her but he couldn't do it, so I have to.
"Luna? Can I talk to you?" I said. I looked at Dipper, but he just got up and walked out.
"What's up sis?" she asked with a happy tone.
"We have found a way to get home. We have to go soon" I said walking towards her.
"What? No. I refuse to go" she said as tears started flowing from her eyes. She backed away and ran up to our room.
"Oh my. What have I done?" I said. I walked towards the stairs when a hand grabbed me.
"I'll talk to her" Dipper said as he walked past me. I nodded and went back to join Mabel.

Luna's POV.

Why? Why do I have to leave when I have found someone who loves me? It's not fair.
"Luna?" a voice from behind the door said. "It's me Dipper".
"Come in" I said looking out the window.
"I know that you have to go home" he said. Why wasn't he upset.
"I guess you're wondering why I'm not upset". Wow. He's good. "I love you so much and you know that. But you need to go and save your kingdom" he said looking me in the eye.
"I know. I know. But, your the first and only pony or person who truly loves me. And I don't want to lose you". I was hugging him tightly now.
"We can come and visit you in..." he said trying to think.
"Equestria" I said giggling.
"Yes.That's it" he said smiling. I leaned over, put my head on his shoulder and he wrapped his arms around me.
"I love you so much Dipper" I said looking at him.
"I love you too Princess Luna" he said as he kissed me on the forehead. I hadn't been called "Princess" in ages, and it reminded me of my subjects. My friends. And little Pipsqueak who said I was his favorite princess. I knew what I had to do.
"Your right. I need to go and help my subjects" I said standing up. We walked out of the room hand in hand.

Mabel's POV.

We had set off the next day. Dipper and Luna in front, and Celestia with me, behind.
"How long has it been?" I said, walking slower. "My feet are killing me".
"We've only been gone 10 minutes" Dipper said. He was looking at the book so much that he walked into a tree.
"Ha ha" I said pointing at his red face.
"How long until we get to the portal?" Luna asked, slowly frowning.
"It should be right here" Dipper said, pointing to a tree.
"Let me try a location spell" Celestia said. She put her hands together and close her eyes. She muttered something underneath her breath. She flew into the air and a trail of yellow sparks led to the top of the tree. They surrounded a branch.
"That must be a lever or something" Luna said, as Celestia flew down.
"I'll get it" I said, confidently. "With my grappling hook!" I aimed it at the branch, shot it and it wrapped around it. I slowly flew into the air, reached the branch and pulled it down. Surely enough, the tree opened up. I flew down and landed in a bush. Luna helped me up and we all stood in awe of the tunnel.
"Let's go down then" Celestia said. Dipper led the way down, with us trailing behind him. At the end of the staircase was a room full of gems and crystals, much like the cave that Luna discovered, and in the center, was a huge crystal.
"Thank you Dipper and Mabel. You have been like family to us" Celestia said, tearing up. She hugged both of us, and then turned to her sister.
"Mabel, you have been another sister to me. standing up for me when Pacifica insulted me and made me feel so good to be different" she said as she walked towards me and hugged me. She let go of me and turned to my brother. I know it was hard to let mermando go but, they truly loved each other.
"I will truly miss you Dipper" she looking into his eyes. She took off her necklace and gave it to him. "Use this to see me. Look into it and you will see me. I will see you in the closest mirror" she said, her hands shaking.
"I love you" Dipper said, holding it,
"I love you too" Luna said. Then they kissed. When they broke apart, the sisters turned towards the crystal and walked through. The surface of the portal rippled. Suddenly out of no where, Dipper shouted, grabbed my arm and before I could stop him, we were through the portal.

Chapter 6 Final

Luna's POV.

I didn't want to leave, but I had to. Going through the portal was a weird sensation. I could feel my self turning back into a pony, yet all I could see were many colours swirling around. It made me feel quite sick. I landed with a thud and saw Celestia by me. Her crown was on her head and her cutie mark had returned. I looked at my flank, and saw my cutie mark there. I looked around and noticed that we were in the Canterlot artefacts room. I turned to see what the portal was, and realized it was a painting of a shooting star above a pine tree.And then I realized, where was Discord?
"Luna, we need to find Twilight and the others" Tia said, as she got used to being a pony again.
"Yes of course. Tia, the painting is a portal" I said holding my hoof towards the picture.
"We can't worry about that now. We must go" she said whilst walking towards the door. I got up and as I was walking to the door, I saw a flash out of the corner of my eye.
"Tia. Look" I said, cautiously turning around. My sister looked at me and her jaw dropped. I wondered what she was looking at, and I saw them.
"What are you two doing here!" I shouted.

Dipper's POV.

I know I shouldn't have followed her through, but what if she had forgotten about me. I couldn't just let her go. The portal felt weird. All I saw were colours and a weird sensation going through my body. I fell on my face and looked up to see a blue pony standing in front of me.
"What are you two doing here!" it shouted.
"Luna?" I asked un-shore. A older looking pony stood behind her. She had a white coat and the same hair that Celestia had, so I knew it was her. I tried to stand up but I just fell down. I looked at my self and realized that I was a pony! My coat was a pale yellow and my mane and tail was brown but I still had my hat. I looked at my flank and realized the was a blue pine tree on it. I looked to my right and saw a pony that looked a lot like me, except she had longer hair, a pink jumper on and on her flank was a shooting star. She looked at me and smiled, showing braces. It was obviously Mabel.
"OMG! Were ponies!" she said jumping up and down.
"Why did you come? Our world isn't safe" Celestia said, looking very serious.
"I was worried about you and wanted to help. So I grabbed Mabel and we followed you here" I said, frowning. I thought that they would want us to be here.
"As you are here, you can help us. But be careful. Discord is the lord of chaos, and will stop at nothing to cause it" Luna said, becoming serious. We both nodded and ran after the princesses through their magnificent palace. We reached the throne room to see it in bits. The walls had cracks in them and a weird creature sat on a red floating throne.
"Hello there princesses" he said, smirking.
"Leave Discord, and return Equestria to it's normal self" Celestia said, stamping her hoof on the ground. Discord started to laugh.
"You can't tell me what to do. I'm the lord of chaos" he said, looking more menacing.
"Then we will just have to stop you" a new voice said. I turned to see six ponies and a dragon standing there.

Celestia's POV.

"Twilight Sparkle" I said, in happiness. They were all wearing there elements and they ran towards us.
"Princess your alright" she said, panicky.
"I'm fine. what about the elements?" I said, quickly. She frowned slightly.
"The book said, to turn the Lord of Chaos to stone for a third time, two more elements, Love and Peace, will be revealed when a Princess remembers their actions" she said remembering of the top of her head. Luna and I both looked at Dipper and Mabel. I remembered the time when Dipper filled Luna with love and when Mable made peace with us instantly. A bright light glowed around their necks and two necklaces appeared. The other six were activated. The eight ponies flew into their positions, and a rainbow flew at Discord. His laughs turned to shouts, as he turned to stone. The ponies flew down and rejoiced happily.
"Celestia, who are these ponies?" Applejack asked.
"This is Dipper and Mabel" I said.

Mabel's POV.

I was one of the elements of harmony and I had just defeated the Lord of Chaos! My necklaces was gold and had a pink, shooting star gem in it. Dippers gem was a blue pine tree. I had met Twilight Sparkle, Rarity, Fluttershy, Rainbowdash, Applejack, Spike the dragon and, my personal favourite, Pinkie Pie. They were all so nice. I saw Luna and Dipper talking, so I went to go talk to them.
"Hey Mabel. We were just talking about what's going to happen now" Luna said smiling.
"So are you to going to stay together or what?" I asked, curiously.
"Well, Twilight said that the portal closes and opens on a full moon. And the portal has just closed" Dipper said, looking at me.
"We can't get back now!" I said. Wasn't he worried.
"Time in your world is at a standstill. You can stay here as long as you like" Luna said, now almost screaming.
"That is amazing" I said jumping up and down.
"So I guess this is the end of a adventure. And now we begin a new one" Celestia said wisely.
And that is how I met the Princesses that got Trapped in Gravity Falls.

The End

Author's Note

I hope you enjoyed the story.