Hello, this is my first solo fanfic, so don't be TOO harsh on the criticism :P (In all seriousness though, if I'm fucking something up tell me, I would really appreciate it) Also, this chapter is kind of short. Sorry about that, I'll try to make future chapters a bit longer. Without further ado, lets begin.

The bus came to a screeching halt. The doors opened and multiple tourist stepped off of it into the sleepy little town of Gravity Falls, Oregon. Four of these tourists in particular stepped off the train. It was the Diaz family, including Marco Diaz and Star Butterfly, the princess from the dimension of Mewny.

"Wooooow it's cool here!" commented Star as she walked through the town.

"Yeah, I heard weird stuff happens here…" her friend Marco said, looking around nervously.

"Aww don't be such a baby Marco, we deal with weird stuff all the time!" the princess said cheerfully. "And if anything bad happens we've always got this to help out!" she said, pulling out her magic wand, capable of many different magical spells.

"Yeah I guess you're right, but still we should be careful here…" Marco responded, still with worry in his voice.

"So…where should we go? Your parents said we can wander through the town right?" Star asked her best friend.

"I heard there's a cool place called the Mystery Shack we could go too, it sounded really interesting…"

"Does it have a gift shop?" Star asked

"I think so." Marco responded.

Star grabbed him by the hand and sped off.

"We don't even know where it is!" Marco shouted as he was being dragged.

Elsewhere, at the Mystery Shack, things were just as they always were. The red headed Wendy was sitting at the cashier, the overweight handyman Soos was repairing the vending machine, the 12 year Dipper Pines was looking through his journal, his twin sister Mabel was knitting a sweater for her pet pig Waddles, and the elderly Stan Pines was marking up prices.

"Gruncle Stan, why do you always raise the prices when tourists come in? Won't that make them buy less?" Dipper asked his great uncle.

"Kid, you need to trust me on more things y'know?"

"Aren't you a professional con man?" Wendy asked casually, not even looking up from her magazine.

"Exactly! I know just how to trick some poor suckers into buy-"

Stan was cut off by the door opening and two kids walking in. It was Marco Diaz and Star Butterfly.

"Woaaaah cooool!" Star said looking around at all of the (fake) attractions.

"Welcome to the Mystery Shack! Buy somethin' or get lost! I mean, uh….enjoy your stay!" Stan said before going to see how Soos was doing on the vending machine.

Star walked around and saw Mabel with her pig. The blonde immediately ran over to the girl and asked "Oh my god do you and your pig have matching sweaters! That's awesoooome!"

Mabel gasped. "Thanks girl! I'm Mabel!"

"My name is Star Butterfly! I'm a magical princess from another dimensioooon!" Star created a rainbow above her as she said this, which proceeded to set on fire.

"Wooah…" Mabel said with starry eyes.

Dipper walked up next to Marco, who was facepalming at Star's rainbow catching on fire.

"Uh hey man, is she…dangerous in any way?" Dipper asked.

"Nah, she's fine. Hey, I'm Marco and the one who just caught on fire is my friend Star. She's…different." Marco said.

"What do you mean?" Dipper asked.

"She's from an alternate dimension." Marco said nonchalantly.

"WOAH REALLY?!" Dipper shouted.

"Yeah. Really." Marco said after getting his eardrums blown out by the kid's screaming.

"Can you tell me anything about the dimension?" Dipper asked excitedly.

"Sure, why not? We could even go there if I can talk Star into lending me her dimensional scissors…" Marco said.

"Cool! Wait, dimensional scissors? What are those?" Dipper asked.

"Basically a pair of scissors that open portals into other dimensions." The green belt responded.

Another customer in the shack heard that part. Not just that, but this customer just so happened to be one of the most dangerous entities in existence inhabiting a human's body.

"Portals to other dimensions huh?"Bill Cipher said to himself, "Those might just come in handy!"

After finishing that sentence, Bill began to laugh like a crazed lunatic, only to stop when he caught Dipper and Marco staring at him.

Bill than bolted out of the store with no explanation as to not blow his cover.

Yeah like I said, it's a little on the short side, but there will certainly be longer chapters in the future, or at least I hope so. Another thing, I know that there are probably other crossovers between these two series already, so if there are any glaring similarities between this one and another they are 100% coincidental, but do still point them out if needed so I can possibly fix it to make it more original. Review and maybe add to favorites? See you guys in chapter 2 if I ever get to it (I procrastinate sometimes...ok a lot of times. Bad habit of mine that I'm trying to fix)