Gravity Foals: Bill in Equestria

by DockingWater17

Rating: everyone
Tags: Other, Gravity Falls, Princess Luna, Mystery, Spike, Science Fiction, Adventure, Crossover, Discord, My Little Pony: Friendship is Magic, Alternate Universe, Main 6
Length: 4718

Bill may have lost in Gravity Falls, but what if he tried to takeover Equestria?

While Bill Cipher failed to takeover Gravity Falls, there are an infinite amount of universes and timelines. So, what happens in the one that Bill has a connection to Equestria instead of Gravity Falls?

There are sections of this story that is based off of a scene from Gravity Falls. However, these sections don’t appear in the same order as their scenes of inspiration in the show. Also remember that there are some spoilers to GF, but there isn't anything too major, at least for the time being. As for timeline placement, this story takes place sometime during Season 9 but after the premier.

This is my second story on FIMfiction, the first one I didn’t even finish. So, any feedback would be greatly appreciated.

Published 2019-07-11 01:40:01 UTC
Last updated 2019-10-16 23:59:45 UTC

Chapter 1: Chaos God Meeting/Reunion

It was a calm night, like most in Equestria. No sounds at all. Even right outside the Everfree Forest. However, something interesting was about to happen in Fluttershy’s cottage. In the cottage, Discord was sleeping, having a peaceful dream that was cut off by some outside force. Then, another dream started instantaneously.

The dragonesque was in the middle of a strange field. The grass around him fell in the shape of a pyramid with one eye and a top hat, as well as arms and legs. Then, the area became a light blue and a laughter was heard.

“I know that laugh.” Discord said to himself. “Show yourself!” All of a sudden, and creature came out of the ground who was shaped exactly like the area in the grass, being yellow pyramid with one eye and a black top hat.

“Well well well well well.” The creature said while duplicating and spinning around Discord. “Aren’t you a sight for sore eye? Discord! My old pal.”

“Bill Cipher.” The crazy mix of animals replied with a more angry tone. “What are you want?”

“Don’t play dumb with me, spirit of chaos. You knew I’d be back.” Bill exclaimed as his clones mess with the dragonesque before going back to the main one. “You can’t keep that spell book safe forever.” The triangle snaps his fingers and a book appears above his hand. “You’ll slip up and when you do.” Bill opens the book and a giant upside down triangular portal activates above his head.

“Get out of here. You don’t have any dominion in our world.” Discord yelled at the other chaos god.

“Maybe not right now,” Bill replied “but things change, Discord. Things. Change.” His voice becoming more sinister during the last word or two. He laughs in the same tone as he floated up into the portal.

Then, Discord woke up. “I have to warn them. He’s coming.”

That morning, Discord woke Fluttershy up early. “We need to go to the Castle of Friendship. Now.”

“Why?” The shy pegasus asked.

“I have something very important to tell every pony. Now let’s go. Prepare for teleportation.” He teleported Fluttershy and himself to the front of the castle and knocked on the door urgently.

“I wonder who would be here so early.” Twilight said curiously. “Can you get the door Spike?”

“On it.” Her assistant opened the door and Discord flew to the Cutie Map as fast as he could, dragging Fluttershy for the ride.

“Discord? What are you doing? Where are you going?” Spike asked. He ran after Discord. They past Twilight, who started to follow as well.

“How do I activate this thing?” Discord asked.

“I can do it with my magic,” Twilight explained, “but I can only do it in extreme emergencies.”

“WELL THIS IS AN EXTREME EMERGENCY!” Discord yelled.

“Ok. Fine. Who should I call?” Twilight asked.

“Every pony.” Discord replies.

“Ok then.” Twilight lights her horn and each of the Mane 6’s Cutie Marks aside from Twilight’s and Fluttershy’s appear around the castle on the map.

A few minutes later, the rest of the Mane 6 run into the room.

“We came here as fast as we could,” Applejack said. “What’s going on? Why were we all needed?”

“I have something very important to tell every pony,” Discord explained. A scroll appeared in his hand. He unrolled it to reveal Bill. “Does any of you recognize this symbol?”

“My dream!” All of the Mane 6 exclaimed.

“Wait. Did you all see Bill in your dreams?” Discord asked.

“I guess so.” Twilight said. “How do you know him?”

“It all started back when I was defeated by the princesses.”

Princess Celestia fired a rainbow beam from the Elements of Harmony. Discord didn't notice the beam until it was too late. The beam overtook his body and slowly turned him to stone.

However, his soul wasn't trapped in his stone coffin like he thought it would for very long. Instead, he somehow ended up in a realm filled with floating objects of all kinds.

"Well, well, well. Look who it is." A voice from behind Discord said. The chaos god turned to see Bill. "A random mess of different animals." He laughs "I'm just kidding. I know who you are Discord."

"Who are you? And how do you know my name?" The spirit of chaos asked curiously. "Also, where are we?"

"I know lots of things. L o t s o f t h i n g s." The triangle responded. "The name's Bill Cipher, and we're in the Nightmare Realm, a realm between all dimensions."

"Well, I guess I should head back to Equestria now. While it's a pleasure to meet you, I have a couple princesses to turn to stone." Discord says before snapping his fingers, but nothing happens. "Wait, what? Why can't I open a portal."

"While your soul is here," Bill began to answer Discord's question," your physical body, and all your powers, are still in Equestria. It looks like you'll be here a while."

"Dang. Welp. I'll just be watching over Equestria while I wait for the next 1,000 years." Discord says, with a bit of anger in his voice.

"Hey. You could hang with me if you want. I'm impressed by what you've done to Equestria." Bill replies. "You deserve a prize of some sort. Here, have a head that's always screaming." Bill claps his hands and a head pops into existence that continually screams.

"You're insane." Discord says, smiling.

"Sure I am, what's your point?" The triangular dream demon replies.

"I like you," Discord answers. "and I'll take you up on your offer. I feel like we'll have a great time."

Discord continued to explain the background. "Later down the line, Bill said that if we worked together, he could also gain a physical form here so we could cause even more chaos. However, when I befriended you ponies, Bill got really angry. Now he wants to take things into his own hands."

"How do we stop him?" Twilight asked.

"We must stop him from getting this book." Discord snaps his fingers and a hologram of a book titled "Interdimentional spells". "If he gets his hands on this spell book, he would be able to open a portal to Equestria and gain a physical form, and if he's able to do that, all hope is lost since even I can't stand up to him."

"Ha. All we have to do is stop a being who's powerless without a physical form from getting a book?" Rainbow Dash asks rhetorically. "That seems too easy."

"That's because it is." Discord replies, "Bill may seem powerless, but he can posses anyone he wants aside from anyone who can enter my dreams like myself, Luna, or Celestia."

"Wait. How can we protect ourselves then?" Twilight asked.

"Well, there's a spell that Luna knows to protect other's minds from the influence of dream demons like Bill," Discord answered, "so we must go to see her." And with that, the others nod and they run out to Canterlot.

Author's Note

There's chapter one of my second attempt at a MLP and Gravity Falls crossover. I tried to make a TwiDip story, but since I have no idea how to write romance, I decided to cancel that story. So instead, this story will be more of a mystery/adventure sort of thing, with several scenes being based of off scenes from Gravity Falls, so I'm not coming up with the whole story from scratch. Thanks for reading, and keep in mind that this is my second story ever on FimFiction, so any feedback would be greatly appreciated.

Chapter 2: The Spell and Shield

After leaving the castle and getting on a train to Canterlot, Discord and the Mane 6 start talking about Bill.

"I have so many questions about Bill." Twilight starts.

"I'm sure you do," Discord replies," and while I would love to answer them, I've already told you what I know about Bill. Well aside from one thing. While he may not be able to enter our world, he can still project himself into our minds through the Mindscape. That's how he was able to get into your dreams. He may also enter your thoughts while your awake and try to trick you as well, but no matter how good his deals may seem, he always twists them in his favor."

"Ok." Twilight said as the train started to slow down. "We're getting close, everypony."

"The train has arrived in Canterlot." The conductor said over the intercom. Everypony got off the train and Discord and the Mane 6 rushed to Canterlot castle. They were able to pass the front gates easily because of Twilight's royalty and ran to the Throne Room, where Celestia and Luna were sitting on their thrones talking to the high class citizens of Canterlot.

"We're so sorry to interrupt, but we have an emergency!" Discord said.

"How big of an emergency to interrupt a very important meeting?" Celestia asked, clearly at least a bit angered at Discord and the Mane 6's surprise visit.

"A code yellow." Discord answered. Luna gasped.

"Sorry, sister. I must talk with Discord in private." Luna exclaimed. "Come along now." She continued as she rushed out of the room. Discord and the Mane 6 followed her.

"Where are we going?" Twilight asked.

"Somewhere in the castle that is so secret, even my sister doesn't know about it." Luna replied, as she stopped faced what seemed to be a random wall, and fire a burst of magic at said wall. All of a sudden, it began to wobble, kind of like water. "Follow me." Luna then jumped in. Discord and the Mane 6 followed her and went through the wall and landed on a lift. Luna then pressed a button and the lift started to go down. When it stopped, Luna open a door that was in front of them and went in. The room they entered was filled with different magic items and books, including the inter dimensional Spell book that Bill needed. Luna pulled a certain spell book titled "Mind Spells" from one of the shelves and started flipping through it. She stopped. "Aha," she began. "Here it is. the mind protection spell. This'll protect you from Bill's control."

"Wait, why didn't we just teleport down here?" Twilight asked.

"I used this room so I could've helped Bill enter our world before you 6 turned me to stone." Discord began. "So, I had to magic-proof the room so nopony else would find it. Of course, after switching sides, I didn't need it for that reason, so I decided to just use it as a bunker of sorts, but then Luna saw me jump through the wall and followed me. I've told her about Bill soon after becoming friends with you just in case and she was able to find a spell. So, who wants to go first?"

"I'll do it." Twilight answered. She stepped forward and Luna charged a spell and fired it directly at Twilight's horn. After it connected, the blue magic traveled down Twi's horn and she fell to the floor.

"TWILIGHT!" They all scream, worried.

"I'm fine." Twilight said weakly. She tried to get up but feel back to the ground. "Ok. Maybe not. That really hurt. It was like a giant bird rammed into my brain at mach 36."

"I'm so sorry." Luna said. "I didn't how much a mind spell would hurt a pony less powerful then me or Celestia. We normally just get a mild headache and nothing else. However, your still an alicorn. If the spell can hurt you that badly, then it'd likely be fatal to anypony else."

"Then what are we supposed to do?" Twilight asked.

"I think I have an idea." Discord answered. "We may not be able to Bill proof our minds, but we may be able to Bill proof Ponyville and Canterlot." He snapped his fingers and two maps appeared, one of Ponyville and one of Canterlot. "If we put moon rocks here, here, and here," he said as he pointed to three points on each map, putting a circle around each point, "sprinkle some mercury, let's see. I always forget the last ingredient." He grabbed another book from a shelf titled "Advanced Shield Spells" and flips through it. "Oh. Unicorn hair. That should be pretty easy to get." He said as he looked at Rarity. "Sorry in advance, Rarity, but this is for the greater good."

"Fine. Just get it over with quickly." Rarity said. With that, Discord summoned a pair of scissors and cut Rarity's mane.

"What about the moon stones and the mercury?" Twilight asked. "Nopony's even been on the moon aside from Luna when she was taken over by Nightmare Moon and I haven't even heard of mercury."

"Well, even if I wasn't myself," Luna began, "I was able to grab some stuff on the Moon."

"And I've got the mercury covered." Discord said. "As for creating the shield, that's probably going to be more difficult with out other ponies noticing. I was thinking that we should do it at night since almost everypony would be asleep at that time. Since Luna has dream duty, I'll set up the barrier around Canterl-"

Before he could finish, Luna cut him off. "Sorry, Discord, but I'm going to need your help in the Dreamscape. Since Bill is on the loose, I'm going to need somepony else to help me cover more dreams at once in case he enters a pony's dream."

"But what about the barriers?" Discord asked.

"We'll cover it." Twilight answered. "Just give us the maps and we'll take care of Canterlot tonight and we'll handle Ponyville tomorrow night."

"Alright then." Discord replied. "It's not like I have a better idea."

Then, the field of view zooms out of the dimension and into the Nightmare Realm with Bill looking over everypony in the bunker.

"So they're giving me a day to pull off my plan. Thankfully for me, that's all I need." He said.

Author's Note

Chapter 2 of this new story is complete and it's already looking way better than my first story, at least to me. Anyway, I probably won't update this story for a few weeks since I'm going to be pretty busy. However, I will try to at least work on chapter 3. Again, thanks for reading and any feedback will be appreciated.

Chapter 3: The Deal

That night, at the Castle of Friendship, Spike was alone in his room and was upset about his current situation. While he was left behind on several different adventures, this adventure was far greater than anything else the ponies have faced before.

"Sometimes I wonder if they even know I exist." The purple dragon said. "I'm fine about being left out of an adventure every once and a while, but this getting absurd. Leaving me behind after it's revealed that a villain more powerful than Discord is trying to posses beings to get into and take over Equestria? REALLY?" He screams angrily.

Little does he know, it's somehow going to get even worse. All of a sudden, he burps out some green flame which turns into a scroll. He opens it and begins to read it. "'Dear Spike, I am so sorry that we will not be get back to Ponyville until tomorrow after noon due to some important things me and the girls have to take care of. Also, Discord won't be arriving for a while because Luna needs his help on dream duty. Your friend, Twilight Sparkle.' Oh come on. Now they won't be here till tomorrow. Dear Celestia. Maybe I need some time on the balcony to calm down." With that, he goes out of his room and makes his way to his destination. He flies on top of the railing and sits on it, looking into the night sky. "Why does this always happen to me? It's like the world is against me. I just wish there was somepony who could help me become noticed by not just my friends, but everypony for what I've done." Suddenly, the moon, which was full, rotated toward Spike to reveal a vertical black line, sort of like a slit pupil. Then a bunch of blue triangles form around the moon to reveal Bill.

"I think I know a guy." The dream demon says in a louder voice. Spike realizes who he is immediately.

“Bill! Your the evil dream demon who’s planning on taking over Equestria.” The young dragon exclaimed.

“What? I would never.” Bill replied, innocently. “Let me guess. Discord told you that, didn’t he?”

“How did you know? And why would it matter?” Spike asked.

“I know lots of things and honestly, Discord is not as he seems.” The chaos god answered. “Remember that time he allied with Tirek.”

“Of course I remember, but that was a one time thing. He wouldn’t do anything like that again.” Spike argued.

“How can you be so certain? He’s extremely random. No pony ever knows what he’s going to do next.” Bill began, “Well, except for me. Here, I’ll show you.” He snaps his fingers and a white door with a picture of a sun identical to Celestia’s cutie mark. “Open it and take a peek inside.” Spike does so. He sees Discord, Luna, and Celestia in Canterlot Castle, except it’s completely destroyed. Celestia and Luna seem extremely angry at Discord, but also scared at the same time.

“Oh. This is perfect. All I needed was to get the princesses in the dream world together. And now Equestria’s all mine.” Discord says and laughs maniacally. Then he snaps his fingers and the two sisters slowly turn to stone. Spike tries to run to help them, but runs into an invisible wall in the door frame.

“Noooo!” He screams. He turns to Bill. “Is that what’s really going to happen?”

“Unfortunately, yes. And that’s why Discord told you and your friends that I was evil.” Bill replied. “He knows I’m the only one powerful enough to stop him.”

“I have to warn Twilight!” Spike says as he runs to find a scroll.

“Are you sure that’s a good idea?” Bill asks.

“What do you mean?” Spike asks back, confused.

“Who do you think your friends would trust more? A dragon who they forget on several occasions or a reality warper who hasn’t turned evil in over 5 years?” Bill asks. Spike stood there shocked. “You can’t get any help from them, but with my help, not only can you save Equestria, but you’ll get the respect you want and deserve.”

“How could you help me beat Discord, who’s only has been beaten twice, both times have been by the Elements of Harmony?” Spike asks, suspiciously.

“I can give you my powers.” Bill answers. “All you need to do is shake my hand.”

“Well, if it means saving my friends and all of Equestria,” Spike began, “let’s do this.”

“Alright then.” Bill replies. He lets his hand out and a blue flame appears around it. “It’s a deal.” Spike shakes Bill’s hand.

“So, how does the power transfer work exactly?” Spike asks.

“Like THIS!” Bill says as he pulls Spike’a soul out of the dragons body.

“Wait what?” Spike looks at his soul. He the. Realizes that Bill entered his body. He wobbles around a bit.

“Woah. Woah. It’s been so long since I’ve inhabited a body.” He slaps cheeks. “Woo. Woo. Pain is hilarious. And two eyes, this things deluxe.”

“No no no. You said you would give me your powers.” Spike said.

“Well, I normally can’t do anything in the real world. Heck, I can’t even be in the real world. I can only be in the Nightmare Realm or the Dreamscape, which is where you are.” Bill explains. “Without a body to possess, you’re basically a ghost. Nobody can see or hear you.”

"What about getting respect for once?" Spike asked.

"Oh, you'll get respect," Bill answered, "when 'you' single-handily defeat the Mane 6 and steal the book that would allow Bill into Equestria."

"No. Twilight and the others will stop you." Spike said, confidently.

"Poor dragon." Bill began. "You really don't know your true potential, do you?"

"Huh?" Spike asked, confused.

"Just think about it. Your able to keep up with Twilight, who is comparable to RD due to her ability to create a variant of the Sonic Rainboom, both on the ground and in the air." Bill explained. "Plus, your fire breath allowed you to defeat the Roc, which wasn't even effected by Twilight's magic. Heck, your intellect can rival Twilight's because you've been taught by her." Spike just floats where he was in pure shock.

"I never really thought about it that way." He said after a few seconds.

"I'm sure a majority of the fan base is right there with you." Bill said.

"What?" Spike asked.

"Oh, nothing." Bill answered. "Anyway, I have ponies to trick." And with that, Bill went in the castle.

Author's Note

Chapter 3 is done. There's one thing I wanted to put into the story, but I couldn't really make it fit anywhere. From this point onward, when Bill is in Spike's body, he will be referred to as Bike. Yes. I know it's a stupid name, but Gravity Falls does the same kind of thing with an equally stupid name. I wanted to put it in the story, but to do so, I wanted to use a specific line from the show that didn't seem to fit anywhere. Anyway, thank you for reading and keep in mind that any feedback is greatly appreciated.

Chapter 4: Bike's Trickery

During Spike's encounter with Bill, the Mane 6 were working on the Bill-proof barrier around Canterlot.

"Come on, guys." Rainbow Dash said impatiently. "We gotta move faster or it'll be noon by the time we finish."

"Relax, Rainbow." Twilight replied calmly. "The Celestia and Luna just lowered and raised the Sun and the moon."

After a few minutes of working passed, a burst of green, fire-like magic came from the direction of Ponyville, which turned into a scroll. "I guess Spike must have returned the letter I sent him." Twilight guessed. She opened it and read it aloud. "'Dear, Twilight. There's something I must tell you and the others about Bill. However, I can't really put it in words on a scroll in case the scroll is intercepted. You must come back to the Castle of Friendship as soon as you're done with your important business in Canterlot. Your friend, Spike.'"

"Well, thanks to my speed, we're almost done." Rainbow exclaimed in way that made it seem like she was definitely bragging.

"Yes, all we need is glue this last bit of unicorn hair riiiiight," Pinkie said as she starting putting down the last bit of hair on one of the walls outside the capital of Equestria while floating somehow, "here." When she placed the last piece, a magic bubble surrounded the city and then went invisible.

"Great." Twilight began. "Now with that out of the way lets head back to Ponyville and see what Spike has to tell us." She starts to walk toward the train station and everypony else follows her.

While the ponies were on the train back to Ponyville, Bike began plotting the Mane 6's end. He flies through the castle and learns the layout to help him get around as quickly as possible during the fight with the Mane 6. "They've constantly shown that they work well together," he thought to himself. "However, there were very few times that they have won without their friends. So, if I can't confuse them and over power them, I should split them up." He concluded. "And I know just the way to do it." He thinks as he heads towards the main entrance.

Meanwhile, Spike panics for a few minutes, but is able to calm down to think of a plan. "I need to save Twilight and the others." He then realizes that Bike went into his the castle. "I should follow him to see what he planned." With that, he flies into the castle and follows Bike. While flying, he notices one of the doors are open and peeks into it. He sees Bike, who is messing around with Smarty Pants. Bike turns around and sees Spike.

"Well, well, well. Look who's decided to follow me." He says as he puts Smarty Pants down and starts walk out of the room. "I hope you enjoy the show."

"No. I will stop you." Spike says, determined.

"But how can you stop me, if you don't exist?" Bike says slowly as he walks by Spike, and then laughs manically.

After Bike walks away, Spike tries to think of a plan. He repeats what Bike said earlier. "'Without a body to possess, you're basically a ghost.'" He looks at Smarty Pants. "But with one, I could save everypony."

Later, the Mane 6 return to the castle, but when they enter, everything's dark. They hear a voice that's similar to, but isn't quite, Spike's.

"Well look who it is." The voice calls out. "My 'friends.'" Suddenly, there's a green flame atop some stairs that lights a torch. Then, several green flames are fired from the same spot at different angles to light other torches around the room.

"Spike? Is that you?" Twilight called out. "What did you want to tell us about Bill?"

"Yes it is me, Twilight," the voice said, before one final flame is fired upwards to light a chandelier, revealing Bike, "but I don't have any knowledge I would want to share with you. Not after you and everypony else mistreated me."

"What?" Twilight said, confused. "I love you Spike. We all do, and you know that."

"If you really loved me, would you overwork me to the point that I get less than an hour of sleep every night? Would Pinkie and Rainbow constantly prank me and only me? Would Rarity toy with me despite clearly knowing I have a crush on her? Would you six leave me behind on several important adventures?" The purple baby dragon asked rhetorically. "No. You wouldn't. Which is why when Bill said that he would help me be noticed in return of helping him break into our reality, I accepted his offer."

"WHAT?!?!?" All of the ponies exclaimed, shocked at the assistant's, that always did the right thing before they left for Canterlot, revelation.

"You're kidding with us, right?" Rainbow said. "Spike, please. We didn't know how much our pranks hurt. Right, Pinkie?"

"Yeah. Cross my heart," the pink pony replied.

"I never knew you had feelings toward me, Spikie Wikie." Rarity said, obviously a little hurt about what their good friend had said.

However, Twilight was very hurt by the small drake she raised and cared for. "This isn't like you, Spike. Don't give into Bill's temptations."

"Correction: this isn't like the old me." Bike said. "This new me knows better. He knows that he doesn't have to be pushed around by his so called 'friends.'"

Twilight and the rest of the Mane 6 realize what they must do. The look at one another and nod, with sad, but determined faces. "We don't want to hurt you, Spike, but we will do what's necessary to protect Equestria." Twilight said, with determination as the rest start to get into position. "Even if that means severely hurting my best friend."

"That book is as good as ours." Bike said, taking flight. "Now enough talk. Have at you." He finishes as he flies into battle.

Author's Note

It's been a while since I've uploaded a chapter, and that's mainly because I've been having trouble coming up with stuff to write. However, I will try to get the next chapter up much quicker, but no promises can be made. As for the story itself, the ponies don't realize that Spike was possessed, which is how Bill's possession worked in Gravity Falls. As always, any feedback would be greatly appreciated and thanks for reading.