Well, Time Stuck AU is one of the best AU ever created, and then saisai-chan from tumblr pitched an idea where Dipper and Mabel were both stuck in the past but separated in that timeline. I guess that I like to take a shot in making this fanfic. So here goes my first fanfic! Hope you enjoy the Prologue.

ideas are from saisai-chan! Give her credit for the amazing Timetrapped AU!

Mabel was in the room that night, after all the things that have happened today, she was glad that Grunkle Stan was reunited with his brother back, even though not as pleasant as she thought it would be. Suddenly, Dipper stormed the room angrily and slammed the door, making Mabel flinched for a second.

"Mabel, I can't believe that you didn't listen to me when I told you to hit the failsafe button for the portal today," Dipper muttered with a hard edge to his voice.

Mabel stared back at him, shocked at what she was hearing.

"What are you saying Dipper? It all worked out, and now we have Great Uncle Ford back! You have the Author! Isn't that what you've wanted all summer?"

Her twin turned to face her. "Well yeah, but that's not the point! You're my sister, Mabel! We're supposed to be able to trust each other!"

"I can't believe I'm hearing this, Dipper!" she cried in a hushed shout, not wanting to betray their fight to anyone downstairs. "I had to help Grunkle Stan! He loves us and I trusted him!"

"But you should've trusted ME!"

Dipper stormed around the room and collecting various objects.

"Do you know how much effort I've gone to in order to help YOU this summer?" he raged. Holding up a sock puppet, he accused, "I was possessed by a DEMON because I was so busy trying to help you finish up a stupid puppet show!"

Throwing aside the puppet, he held up a broken pool whistle. "I got fired from being a lifeguard because YOU had to help out a stupid crush!"

"Dipper, I–"

"And," he interrupted, holding up Blendin's tape measure, "we had to ruin everything I had worked for with Wendy just so you could win a stupid pig!"

A seething silence followed.

"Well, Dipper," Mabel huffed, taking a step forward, "I'm so SORRY to have ruined your entire summer! Let me just help you get rid of all these terrible reminders!"

Mabel lunged for and snagged the puppet and whistle, throwing open the triangular window and hurling them out of it. Spinning around, she dove for the tape measure.

"I can't believe you're mad at me for doing the right thing! I'm just trying to do what's right" she shouted, trying to wrestle the tape measure from Dipper's grip.

"Mabel, stop, you'll break it!" her twin yelped with alarm.

"GOOD! Just like I apparently break everything!"

She snagged it from his grasp and ran to the window to toss it, but just as she was about to she heard a sickening snap.

To her horror, she looked up in time to see the tape reeling back towards her.

"Oh no, MABEL NO!" Dipper jumped at Mabel as soon as the tape reeling back towards her, and suddenly everything was much too bright, she felt Dipper hugged her and she felt both of them falling back, and everything was gone in front of her eyes.

Mabel tripped, skinning her knee on the hard cement. She got off the ground and dusted herself off. She looked around… whenever she was, it was nighttime.

She was in an alley between a couple of brick buildings. Past the sidewalk outside, she could faintly see the glow of neon light.

"Dipper?" Mabel called and looked around her to see where her brother had gone. "Dipper where are you?" She remembered the tape measure.

The last time she was holding it. She started to look for the tape measure, but nowhere to be found. Mabel started to panic.

Dipper was nowhere near her, and the tape measure is nowhere to be found. A tears began to flow as she realized her horrible fate;

She was stuck.

Dipper fell onto a snowy road, hitting his face into the cold snow. The tape measure slipped out of her hands and clattered on the ground. He got off the ground and looked around… he was in the forest, and it was snowing.

Dipper looked around for his sister, wherever she was.

"Mabel? Mabel?" He called her sister around him and there was no answer. Dipper started to worry where his sister ended up. He walked around and stumble upon the tape measure.

The tape measure was lying on the snowy ground, its case cracked open. Complex-looking circuitry was visible inside.

Pieces of it littered the ground in front of her, and even if Dipper didn't know how all the parts fit together he saw cracked glass and twisted metal and knew that couldn't be good.

"Oh no….no, no, no, no, no!" He picked up the tape measure and inspect the damage, it was beyond his "screwdriver repair".

Even the device was still functional, he couldn't go back to 2012 without Mabel.

He looked around and saw in distant; a house. He needed to get to that house immediately as he couldn't stand the cold and his body started to shiver.

Dipper started to walk to the house in hope for someone… that believe him would help him to find his sister and repair the tape measure.

He needed to try.

Pretty short huh? Yeah, the Dipper part was pretty 'meh' but hey, its a start.

Review please! It would be highly appreciated.