One night Twilight, Applejack, Fluttershy, Rainbow Dash, Pinkie Pie, and Rarity were talking a walk. Rainbow saw a glowing light.

"It's gorgeous out. Just gorgeous." Rarity said smiling, while looking at the clear, starry sky.

"Sure is." Applejack added.

"Where are we going?" Fluttershy asked.

"We're not going anywhere. We're just walking." Pinkie Pie said cheerfully. Rainbow stopped walking and everyone looked at her.

"What's that over there?" Rainbow asked, pointing to a shining, blue light in the distance. She ran towards it.

"Rainbow! Wait!" Twilight shouted. The girls ran after her. They all got to close. The light starting pulling them in.

"What's happening?!" Fluttershy screamed.

"We're being sucked in! Hold on everyone!" Twilight shouted. They got sucked in and they landed hard on the ground and passed out until morning.

They woke up by a forest, in front a museum.

"Where are we?" AJ asked as she and her friends sat up. Then she screamed.

"What?!" her friends asked, worried.

"Look at y'all." she said wide eyed. Her friends looked at each other and screamed. They looked different, and their clothes were different. They were still humans, but they looked different. Twilight was wearing a purple shirt witha white collar and tie, with a navy blue skirt, and she was wearing white socks with silver flats. Fluttershy was wearing a yellow sweater, that showed her shoulders, a gray skirt, and black flats. Applejack was wearing an orange, checkered shirt, dark blue skinny jeans, and brown boots. Rainbow Dash was wearing a light periwinkle shirt with a yellow lightning bolt on it, a light blue jacket with a dark blue collar and red stripes, dark blue skinny jeans,and red sneakers. Rarity was wearing a periwinkle shirt under a white, buttoned jacket, a white skirt, and black heels. Pinkie Pie was wearing a light pink shirt, with a yellow smily face on it, with blue and yellow on the sleeves and collar, hot pink skinny jeans, and light blue high tops, with yellow stripes on them.

"So where are we?" Applejack asked again. Twilight turned around and looked at the sign on the museum.

"The Mystery Shack. Might as well go in." Twilight said as they stood up. A boy, girl, teenage girl, and fat man approached them.

"Are you okay? We heard screaming." the young boy asked. He was wearing an orange shirt with a blue vest over it, gray shorts, and a white and blue hat with a blue tree on it. He also had black and white shoes with white socks. He had dark brown hair.

"Yeah. We're fine. Thanks." Twilight said looking at the four people.

"I'm Twilight Sparkle. This is Applejack."

"Howdy." Applejack said while tipping her hat.

"Rainbow Dash."

"Hi." she said her arms crossed, and smiling.

"Rarity."

"Hello." she said waving.

"Pinkie Pie."

"Hello." she said smiling, and jumping up and down.

"And Fluttershy."

"Um. Uh. Hi." Fluttershy whispered, stepping back.

"Hi. I'm Dipper. This is my sister Mabel. And these are my friends Wendy and Soos." he said smiling.

"Where are we?" Rainbow asked.

"You're in Gravity Falls." said Mabel, smiling happily. She was wearing a pink sweater with a five-pointed star, with a purple, green, and orange rainbow coming out of it. She also wore a pink skirt, a pink headband that matched her sweater, and she had braces. She had on white socks and black flats. She had light brown hair.

"I'm Soos. My friends call me Soos." the fat man said. He was wearing a dark green shirt with a gray-green question mark on it. He wore light brown pants and a dark brown hat. He wore white socks and brown shoes. He was bald.

"I'm Wendy." the teenager said. She was wearing a dark aqua, checkered shirt, dark blue pants, and dirty, brown boots. She wore a winter styled hat. She had red hair.

"Where are you from?" Dipper asked.

"Canterlot." Twilight said.

"Where's that?" Wendy asked.

"In Equestria." Twilight said.

"Do you have anywhere to stay?" Mabel asked happily.

"No. I guess we'll stay here." twilight said looking and pointing to the woods.

"You don't want to stay there. One time a pack of wolves tried to eat me, and an owl tried to eat my tongue. Stay with us." Dipper said.

"Are you sure? We'd hate to intrude." Rarity said, looking worried.

"Yeah. Come on. You should meet Grunkle Stan." Dipper said, walking into the museum. His sister and friends followed. The girls followed. Inside they were greeted with all sorts of strange and creepy objects, including a jar of eyes, skulls, and many other creepy things. A old man approached them. He wore a black tuxedo, a red tie, a maroon fez hat with a yellow fish design on it, a cane with a number 8 ball on the top, square glasses, brown shoes, and an eye patch that went over his left eye over his glasses.

"Welcome to The Mystery Shack. My name is Stan Pines." the old man said smiling.

"Grunkle Stan, these girls are lost. Can they stay with us until we can find a way to get them home?" Dipper asked seriously.

"Will they work for free?" Stan asked not smiling, and lifted up his eye patch. His eyes were normal.

"Sure." Twilight said.

"Yeah. Why not." Stan said then walked away. Everyone smiled.

"Thank you so much." Twilight said smiling.

"No problem." Dipper said. Stan came out with some cleaning supplies.

Twilight and Dipper swept the floor, while AJ and Fluttershy dusted the shelves. Rainbow Dash and Wendy stood at the counter. Pinkie Pie, Mabel, and Rarity washed windows.

"How much does this guy pay you?" RD asked Wendy, bored, her head leaning on her hand.

"He doesn't." Wendy said, looking bored.

"HE DOESNT?!"

"Nope. He's cheap."

"I can tell. So why do you still work here?"

"I can hang out with my friends, and we see some pretty awesome stuff."

"Like what?"

"Follow me." Wendy said, leading Dash to her spot on the roof.

"Hey... uh... Twilight is it?" Dipper asked.

"Yeah."

"Be careful where you go and what you do in Gravity Falls. Also, don't trust anyone, accept me, Mabel, Soos, Wendy, Stan, and that pig over there. That's Waddles. He's Mabel's."

"Why?"

"I'll tell you later in private."

"Ok."

"Keep working. I should keep you girls around longer. I need the extra help. Especially when I can't reach the remote." Stan said coming into the room.

"Why does he need help reaching the remote?"

"He's lazy and he's Stan."

"Pinkie Pie. I love your hair! Its so poofy!" Mabel said to Pinkie, smiling.

"Thanks Mabel! I like your braces!"

"Ha ha. Thanks. Applejack. Where did you get your hat."

"I won it bobbin' for apples at a fair."

"Cool. I like your accent."

"Thanks." AJ said, smiling.

"You're really pretty Rarity."

"Thank you darling. So does your Uncle-"

"Grunkle."

"Sorry. Does your Grunkle Stan always make you work like this?"

"Yeah. It's fun though. We've seen some cool things. One time we saw a ghost, and another time there was a time traveler, and then we saw the Summerween Trickster." Mabel explained. Pinkie listened in awe, but AJ and Rarity thought Mabel was nutty. They looked at each other in confusion.

"That's amazing!" Pinkie shouted, smiling widely.

3 Hours Later

"Well, work's done for today." Dipper said, putting his broom away.

"Follow us." Dipper said, leading his new friends upstairs. This is me and Mabel's room.

"So. This is going to sound really crazy." Dipper said, closing the door.

"In Gravity Falls we see-" he was cut off by Mabel.

"We see ghosts and monsters!" Mabel said, smiling.

"Are you sure this wasn't a dream?" Twilight asked.

"I'm sure. Follow us." Dipper led them to the tree where he found the journal.

"This is where I found this!" he said, pulling something out from his vest.

"Uh Dipper. That's a picture of Wendy." RD said, confused. He blushed.

"I meant this!" he said, as he held up the journal.

"Look what's inside." Dipper said, flipping through the pages.

"This is all here? In Gravity Falls?" Fluttershy asked, worriedly.

"Yup." Mabel said, happily.

"Have ya told anyone?" AJ asked.

"Nope. Only Mabel, Soos, Stan, Wendy, and I know." Dipper said seriously.

Just then, a blue flame appeared in the air and from that blue flame came a yellow triangle with one eye and a top hat.

"Hey. Hey. Hey. What's shakin?" said the triangle guy. The girls just looked at the suspended, yellow thing in fear. Dipper wasn't afraid.

"Go away Bill!" he shouted.

"Aw. Come on kid. You know I was just playing around when I stole your body." Bill said.

"We don't want you here!" Dipper Shouted back.

"Yeah! Go away before I take away your tiny top hat!" Mabel shouted. Her comebacks weren't always the greatest.

"Alright. Alright. Yeesh. Just remember I'm always watching." He laughed and then poofed out of sight.

"Do you believe me now?" Dipper asked the girls. They nodded their heads, still too shocked to speak.

"Who was that?" Twilight asked, still frightened.

"Bill Cipher. He likes to go into peoples' minds and find your secrets." Dipper said, flipping to the page in his journal.

"What's that wheel around him?" AJ asked, pointing in the page.

"I'm not sure. But all we know is that we have to be careful what we do and say. He could be hiding anywhere." Dipper said, seriously.

Just then, they heard a high pitched scream. They recognized it as Pinkie Pie's.

Pinkie Pie was being pulled back by something. Fast too. Her knuckles were white from clutching the ground, trying to get out of the creature's grasp. Tears escaped her eyes. Her hair was flat, but she wasn't a serial killer. She screamed.

"HELP!" Her friends ran after her. Rainbow Dash ran and jumped at the creature, but was smacked in the head, hit her head against the tree, and was knocked out. Fluttershy ran over to Dash's aid, partly because she was terrified. The creature moved into the light and was seen to be a giant green monster with sharp, yellow claws. He also had razor sharp teeth.

He bit Pinkie's arm and with some effort, ripped it off. She screamed in pain, her blood going everywhere, and her bone and arm muscles could be seen. Guessing the monster didn't like the taste for her blood and organs, he threw her to the ground, and disappeared. For now.

Pinkie was lying on the ground, motionless. Blood stained her once colorful clothing. Dipper had luckily kept a roll of bandage in his vest, and wrapped around, what was now only Pinkie's shoulder. He wrapped it as tightly as he could, and clipped it closed.

Dash was still knocked out, her head bleeding badly. Dipper taped some gauze on her head, and Soos carried her. Pinkie was carried by Wendy, and their friends walked back to the shack with them, crying. Mabel was absolutely devastated. She hated seeing her friends hurt. The group walked back in silence.

When they got back, Stan greeted them. He got a worried look on his face.

"What happened here? WHOA! DID SHE LOSE AN ARM?!"

"Grunkle Stan. We saw a green monster. It ripped Pinkie Pie's arm off and knocked out Rainbow Dash." Mabel said, sadly.

"Bring them upstairs." Stan said, seriously.

Soos placed Dash on Mabel's bed and Wendy placed Pinkie Pie on Dipper's bed.

Rainbow Dash slowly opened her eyes. Her friends were happy she was awake.

"Rainbow Dash you're awake!" Twilight exclaimed happily. Rainbow looked around confused.

"Are you talking to me?" she asked.

"Yeah. Who else is named Rainbow Dash?" Twilight said, happily.

"Wait. Who's Rainbow Dash?" she asked confused.

"Duh. You." Twilight said. She thought Rainbow was pranking her.

"Oh. I am? If I'm Rainbow Dash, then who are you?"

"Twilight. Come on Dash. Stop playing around." Twilight said happily.

"Wait. Who's Dash? Is that like Rainbow Dash's sister or something?"

"Okay Rainbow Dash. This isn't funny." Twilight said, seriously.

"What are you talking about? I'm so confused. If I'm Rainbow Dash and you're Twilight, then who are the rest of you?"

"Rainbow Dash! Stop! This prank isn't funny!" Twilight said, sternly.

"I have no idea what the hell you're talking about!" Dash shouted back.

"You don't remember us?" Twilight asked.

"No. Have we even met before?"

"Yeah." Her friends starting tearing up again.

"Why are you guys crying?"

"Nothing."

"No something's wrong."

Just then Pinkie Pie moved.