I. The Boring-Interesting Paradox

It's been a few months after those fantastic vacations the Pines twins had in Gravity Falls started. Both had been busy with their new year at school as technically teenagers with loads of homework and very boring lives compared to the wacky, crazy and mostly weird adventures they lived while visiting their Grunkle Stan.

It could have been much like before if they hadn't brought something with them. Mabel had her best friend in her entire life, a little cuddly pig she called Waddles, because he waddles like a duck; their cat didn't appreciate being the second favorite pet of Mabel, though her parents loved it immediately. Dipper, on the other hand, had gotten a journal for him after Mabel got lost between dimensions and her counterpart from another dimension, in which she was more like Dipper, gifted it to her and then she gave it to Dipper.

As time went on, they had more free once their winter vacation started. During their free time Mabel spent as much as she could with Waddles and Dipper read the journal over and over unveiling all of its mysteries.

"Well, I've read this through and through and… It's mostly blank" said Dipper to Mabel who was slightly disappointed.

"How can it be?" she asked intrigued.

"I guess that version of you had just started this and wanted me to have it." He said as he pulled it out of his backpack. "Look. It says 'This Journal Is Property of Dip…' Looks like I can fill it on my own."

"Are you sure? Have you tried using black light?"

"Yep! That's why I hadn't told you anything." He said slightly disappointed for there being no mystery to solve with the journal.

He approached the window to see down street and thought of something.

"Mabel, do you remember that old abandoned convention center?"

"Yeah," she shivered, "It creeps me out everything I come close to it!"

"Well, they say it mysteriously shut down ages ago! Maybe it's worth checking out!"

"Uh-uh, no way I'm getting in there!" the girl shouted. "I don't want to get near that place!"

"Are you serious?" He asked surprised. "We got into a haunted convenience store, crawled through Gideon's armpit and survived Weirdmaggedon! What could be worse!?"

"Remember that there's that one-eyed cat that lives there and creeps us out?"

"Yeah, what's wrong?" he asked unsure what his sister tried to say. "I've seen you trying to give that cat a second eye on countless occasions, and you getting all kinds of scratches afterwards!"

"I'm really weary of one-eyed things after Bill took over your body…"

"Sure, that was a bad day. But, there is nothing you should be afraid of that cat. C'mon!"

After a few more minutes of convincing Mabel to go there, they finally decided to go on and explore that abandoned convention center.

Once they arrived, they started to look for clues for its deteriorated state. The one-eyed cat was also there, hunting some mice to eat and avoiding Mabel. Clearly it had developed an instinct to be afraid of her for so many times trying to attach a fake eye, which the cat didn't appreciate much.

The twins spent much of their time turning rocks that may look misplaced or something like that. It was around midday when they started and seemed to have no progress in trying to get to the end of their task, and Mabel was convinced to put a hold on it once she started to feel hungry.

"Dipper, we've been here four hours," she said bored, annoyed and hungry; mostly hungry. "Don't you think it'd be best if we took a break to eat, or something?"

"I don't think so, sister." He replied as if he hadn't lost any energy. "I'm convinced that now we could-" He cut himself mid-sentence when he found an old ID card.

It read "WICKED SCIENCE FAIR XI" They knew it was one of the last events ever held there and weren't sure if that meant anything extraordinary, until they took a closer look. Mabel took it and dusted it off. Once she finally managed to make letter clearer, they made an interesting discovery; the second line read "J_DGE", immediately coming to the conclusion it must have been judge with an erased u" and next to it the name: "STAN_ F. _IN_S"

"STAN F. I N S. Do you think it means…?" Asked Mabel.

"Do I think it refers to Ford? Yes." He replied sure of his words. "After all, Ford is a genius and would seem completely logical for him to do stuff like this in… Wow, 6/18/81! It's so old!"

"Let's go for him!"

"Yeah, the problem is we don't know where he is right now."

"We'll get some way to get there."

Mabel seemed more optimistic upon their discovery of their Grunkle. Right after this, Dipper seemed eager to put this as his first entry into his journal. Mabel felt so good she decided to try, once again, to stick a fake eye to the cat, given her brother would be entertained for a while.

She knew where its favorite places to hunt, so she thought she would find it pretty easily. She looked for the places 1 and 2. She made a finding checking in the third spot but it wasn't what she was looking for.

"AHH!" she screamed, which startled Dipper. "DIPPER! THERE'S ANOTHER DIMENSIONAL RIFT!"

Dipper stopped what he was doing and rushed to help his sister. After all, there was no reason for any dimensional rift to appear, much less outside Gravity Falls. Ford made sure they had already closed any one left.

When he got to his sister, he was surprised to see indeed a dimensional rift.

"That's impossible!" He exclaimed a little scared.

"Are you sure that we didn't left any behind that could have moved here?!"

"Yes! According to Ford's calculations there should be none left!"

"Let's throw everything we can to clog it!" Said Mabel in desperation to get rid of it, and then threw in the biggest rock she could find.

"Mabel, I don't think that's going to work!" he said with worry in his tone.

But the stone went in anyway and heard it definitely hit something as they there was a thud following after. What they had never expected was for it to bounce back after they heard a loud "ow!" from the opposite side of the rift. This scared the cat away too and they were more scared than before. Both came together and hugged each other and walked away without stopping to watch it.

"What was that?!" exclaimed Dipper.

"This things usually don't return us anything!" said Mabel.

"That's not what happens," said a more curious Dipper. "What if…?"

Slightly more intrigued, Dipper, but no less scared, stretched his hand towards the rift. His arm was shaky. He had thought of the possibility of Bill or something like him hiding behind it.

"Be careful, Dipper!" said Mabel.

He nodded. They left each other as he walked closer to the rift and picked up a small stone with his hand, in case he needed it. As he came in closer, nothing seemed to be attacking or hurting him. That is when a hand came out of the rift very slowly.

At that second he threw the stone to the hand. Yet another "ow" came out of the rift, but somewhat different to the first one. There were more than one, whatever there was behind it, and were susceptible to being hit with a rock, which also came back after a few more seconds.

Dipper grabbed another stone and got closer to it. At every step he took he was more confident that he and Mabel could take them on with stones.

Out of the sudden they saw a head coming out of the rift, which made them scream once again.

TEDR ZY YLR PELWT EEW PHTCO