A/N: Really fast, I want to remind you guys that this is my first ever story, so bear with me, it might be awful. Also, I want to be very clear that I don't own Gravity Falls. You should probably know this if you are reading it, so I'm going to stop rambling. I am going to add one or two of my own characters to this story, and them, I am proud to say, I do own. The first chapter will mostly just be them, so don't worry if you barely understand what's happening. That's sort of the point. Sorry for all this, and feel free to tell me how to do things better for this story. Here we go.

Chapter one: A new mission

-? POV-

I looked down at the 14 year old girl in front of me. Her birthday had just passed, and it was time for me to give her the biggest news she's ever gotten. I pulled my dark hair into a bun, and looked at her, staring at me anxiously from across the desk.

The lighting in the room was fairly dim, so I could hardly see just how wide her blue eyes were getting, or how tightly her always bright red lips were pressed together. She seemed to be nervous, so she put her light brown, curly hair up in a side ponytail.

She was the best agent there was in my agency. She had saved so many lives in her 4 years of training here. She had been through so much, too. I knew it was time to give her a level one badge. She would soon become the youngest person to ever reach the highest ranking of the agency!

"What do you need from me, Mrs. Matthews?"

When she spoke, I suddenly remembered the task at hand. I needed to give her a final mission, to earn her level one badge. I straightened my blue dress, and I looked her in the eye, ready to give the good news.

She wiped her hands on her jeans, she was obviously not ready for a talk with the leader at the agency, but I still had my mind made up. One day, this little girl would very likely take my place, leading all these agents. She would start on her path to victory here and now.

"Rana, you know that you are one of our best agents, and most of the people your age wouldn't even be able to reach level 3, nonetheless level 2?"

She brightened up a bit, knowing now that the conversation was seeming to go in a very good direction.

"Yes, most of my friends are only level 5 or level 4."

I smiled at her, which seemed to throw her off a bit, considering she was apparently expecting to get fired or something. Still, after a bit of confusion, she smiled back.

"You know, Rana, you really would be able to handle level 1, wouldn't you?"

She opened her eyes wide again, along with her mouth. She obviously wasn't expecting this much.

"Well, yes, I guess so. One problem, though. Don't you have to be at least 18 to be level 1?"

I had already considered this, of course, and she should've known that, but I was very ready to make an exception for this child.

"You have already met every other requirement, so I can simply overlook your age. Although, there is one last thing you must do to reach level 1. Do you know what that is, Rana?"

She looked at me, a little bit like I was crazy, but then she sat up straight and gathered her thoughts, and spoke again.

"Of course I do! The last thing an agent must do to reach level 1 is go undercover for 3 months to a world where we no longer have a TV show or movie or book series to use for the public to know what is happening there. So, basically, 3 months of deep cover in the unknown."

Oh, you probably don't understand a word Rana just said. The agency that I lead is a special one. We use television and books and general creativity as portals into a new world. Every time a book is written or a movie is shown, or a TV show is aired, a new world is born. There is an entire timeline for the world, don't get me wrong. Still, all that the public will see is the part that has been written for the public eye.

We still have a way into the world after the show or book or movie ends, but we only get limited information on what is going on. What Rana had to do was terrifying. She needed to go to a world that we know very little about anymore, and she needed to protect the residents from a new evil. I decided to speak again.

"Yes, and you have saved many residents of many worlds, and not altered too much of their timelines. Still, we all know that there is one more world that you have not yet been to, one that you have always wanted to go to. The agency has discovered a new threat to this world and you will likely need at least three months to exterminate it. You are the best choice for this mission, and we'd love it if you would accept."

She suddenly realized what world I was talking about. Then I got the "you're crazy" look again. Soon, she found the words to say to this mission.

"Wait, you're not sending me to Gravity Falls, are you? We both know the reason I've never gone there! What if he escapes my mind?! I've kept him trapped there for so many years! He will destroy them! His powers are stronger there! I won't be able to fight them!"

She was breathing very quickly. She was absolutely horrified at what I had just said. That didn't matter. She had to accept that she was the only one who could defeat this new threat.

"Rana, you and I both know that he has been drawing you towards Gravity Falls. He wants to go back, and he will do it with or without you. If he goes without you, then no one can ever defeat him again. If he goes with you, then you can keep him contained, and maybe even use his powers against him."

Rana then looked at me, confused. She hadn't known that she could use his powers against him! She needed to know, I said the right thing.

"What do you mean, use his powers against him?"

It was time to explain. This was going to be tough.

"He has lived inside you so long, that you could possibly channel his powers, because they are inside you, too! When he leaves you, one of four things might happen. One, he keeps the power, you get nothing. Two, you keep the power, he gets nothing. Three, you both get some of the power. Four, and I hope this doesn't happen, one or both of you die."

She stared at me, wide-eyed. She started to shake.

"What? Why would I die?"

This was not going to be fun.

"You two have a special link now. It may very well kill you to break it. That's part of the reason why he hasn't escaped yet."

She took a deep breath. Then, she sat up straight and looked me in the eye.

"Fine. It sounds like I am the only one that can protect those kids from the threat, then. I assume that I'm going to the second summer in Gravity Falls, and protecting the kids from the same thing that I may very well unleash upon them?"

I nodded, solemnly.

"Then I accept. When do I leave?"

I smiled. Then, I delivered the least shocking news of the day.

"You will leave tomorrow."

She nodded her acceptance, and we said our good byes, and she left.

A/N: I promise that in the next chapter, you will see plenty of the Gravity Falls characters that you know and love. Rana is going to have an interesting time there, to say the least. Keep on reading! There will be more action, emotion, and mystery as the story progresses.