The sun was high in the air and Dipper, Mabel, Soos, and Wendy were lounging around in the gift shop. Business was slow that morning and the group had exhausted their normal boredom quenching activities.

Ford pushed the front door open with Old Man McGucket following behind him. They were holding various boxes of electronics and devices and went into the basement.

"What's up with them?" Wendy asked.

Dipper shrugged. "I don't know. Great uncle Ford and uncle Archer have been spending all their time in the basement lately but they won't tell me why."

Mabel's face perked up. "This looks like the perfect time for some mystery-solving by the mystery twins!"

Soos pulled a magnifying glass from his pocket. "Alright! Time for a classic mystery hunting adventure, just like the old days!"

Wendy kicked back. "If it means not hanging around here and rotting away, I'm down."

Stan cleared his throat and the group turned to see him standing in the doorway, glaring at them. "Leave Ford and all of his weird nerd friends alone. If they don't want you involved then you're not to get involved." Stan growled.

Dipper was about to protest when they heard a loud boom from outside. The group ran out the door and saw a giant purple mushroom cloud rising from the town.

Theme Song

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Commercial

Everyone arrived in town to find the townspeople in disarray.

There was an abnormal amount of raccoons running around and multiple eagles were swooping down and harassing the residents.

Candy and Greta were screaming as one large eagled chased the two of them. Mable narrowed her eyes on the bird and ran between it and her friends. "Get out of here bird brain! Or I'll make you regret it!" She threatened, and the bird flew off.

"What in the name of Antonio Rose is going on here?" Stan asked, looking around at the unfolding chaos.

Sheriff Blubs and Deputy Durland were ringing a bell outside the town hall and trying to coral residents into the building. "Town meeting! Town meeting!"

The Mystery Shack employees made their way into the building to find the majority of Gravity Falls in the large town hall.

Mayor Tyler was at the podium trying to get everyone's order while people buzzed about what was happening.

"Everybody listen up!" Manly Dan shouted.

Tyler cleared his throat. "So everybody. Recently there have been a few issues like people turning into raccoons and giant eagles attacking everybody. Don't worry, it's probably just a cold. It'll go away soon."

Everyone nodded and rumbled with agreement. Robbie stood up and threw his hands into the air. "Are you kidding me? It's OBVIOUSLY witches!"

People began to gasp and whisper. "Like think about it! After the never mind all that we're probably cursed!" Robbie insisted.

Stan began to laugh. "Witches? That's the dumbest thing I've ever heard!" People glared at him and he shrugged. "What? I know this town in and out! You guys have probably just been putting some unicorn pee in the water!"

"That's just ridiculous!" One townsperson said. "There ain't no such thing as unicorns! It has to be witches!"

Tyler didn't seem remotely concerned by the disorder. "Well, maybe it is witchcraft. What do we do if it is?"

"We have to find out who here is a witch, and then get them to remove their curse," Robbie instructed.

Dipper groaned. "You can't be serious."

"Alright well, you talk to me about how we can find that witch. The rest of you... uhm... take a break." Tyler instructed. Robbie went up to the podium where Tyler was and they began talking.

Stan crossed his arms. "This is ridiculous." He grumbled.

Soos nodded. "Right. There has to be a much more simple explanation."

"Like unicorn pee." Stan offered.

"You're really hung up on that," Dipper said. "Anyway, the water is a good place to start. We'll probably have to sneak out though." Dipper began scouting the exits and pulled out a notebook.

"Alright! Adventure time!" Soos pumped his fist into the air.

Mabel grinned and pulled off her sweater, revealing a second sweater that said 'Adventure' on it. "As always, my sweaters are always ready!"

Wendy chuckled at Mabel and the group was ready to move out when Pacifica walked up to Dipper. "Heya Dipper!"

Dipper glanced up at her and buried his head back in the book. "Oh hey, Pacifica."

"So you guys don't think that there are actually witches, right?" She asked. The group shook their heads and she grinned. "Thank goodness! We have to prove that this is all crazy."

"We?" Dipper raised his eyebrow.

Pacifica put her hands together and looked down. "W-well yeah. I thought I could come with you guys and help you out. I spent the last year becoming way more independent and I want to go on one of these adventures!"

Dipper looked back at his group and they shrugged at him. "Well... I guess you can come along. No harm in some more help."

Pacifica's face lit up. "Awesome! So how are we getting out of here?"

"Good question," Dipper said and he looked at Wendy. "Wendy, do you think you could get your dad to start a fight with someone so we can slip out?"

"I'm amazed I even have to try sometimes," Wendy smirked and she went off to go say something to her dad.

Dipper gestured to a back door and the group was about to run off to it when Dipper stopped. "We can't just all leave. They'll tear each other apart. Somebody has to stay behind and keep everybody sane."

Stan pointed to himself and cleared his throat. "Obviously I should be the one for the job. The people of this town trust me more than any of you."

Everyone clearly wanted to say something but they didn't. They heard a loud commotion and saw Manly Dan in a fight with another Gravity Falls resident. Dipper, Mabel, Wendy, Soos, and Pacifica took that is their cue to run and they bolted out the door.

Commercial

"Look, Ford, I get what you're going for. But do you really think we can take all three of them out at once?" Rick asked.

Rick was standing in his lab and talking to Ford through a portal. Ford handed McGucket a wrench and wiped some sweat from his forehead. "I'm not sure. But we're some of the greatest minds in the universe. We have to try. Those Ciphers are not to be trifled with."

Archer crammed some sort of glowing orb into a large compartment. "I think we're making good progress. But how much time do we have again?"

"Not enough." Ford sighed and he went back to scouring the notes of his blue journal.

Dipper, Mabel, Soos, Wendy, and Pacifica were cautiously walking through the town, avoiding the giant eagles as best as they could.

"So, where are we going to first, Dipper?" Pacifica asked.

Dipper pointed at Tyler's Mansion. "I figure he probably keeps the documents for anything he's changed in his house. So we can figure out what might've caused all of this."

Soos pointed at a raccoon fighting with another raccoon over a shirt and laughed. "Look at that. Raccoons are funny man."

Wendy glanced over at him. "You know those are people that were turned into raccoons, right?"

"Wait really?" Soos asked. "Lucky." He grumbled.

The group made their way to Tyler's Mansion and found the gate was locked. Dipper looked the area up and down to try and find a way in and put his hands on his hips. "Man... how do we get in?"

Wendy tried climbing the gate but slipped down. "Man this thing is slippery. I can't get a good grip at all."

Pacifica scratched her chin and then pointed at a gate mechanism over the fence. "Oh! This is the same one as the gate I used to have! If we can damage the thing over there the gate will open! It's really poorly protected for the mayor's mansion..."

Dipper looked off to the side but nodded. "Uh sure. We can try that. Mabel, Soos, try throwing pine cones at it."

Mabel and Soos picked up pine cones and began chucking them at the machine until it began to short circuit and the gate swung open.

"Ha! Like I said!" Pacifica held her hand up to Dipper but he ignored it. She frowned as the group walked inside the mansion.

Mabel grabbed a vase and admired it. "Wow, this thing is cool." She held it to her face and water poured onto her. "Ew gross!" A fish fell onto her face and then flopped onto the ground.

Wendy scooped up the fish and dropped it into another vase. "What kind of whack job keeps a fish in a vase?"

"The same kind that entertains witchcraft as a real possibility," Dipper said, strolling up the stairs.

"Ugh, I still feel the wet fish... gross," Mabel complained.

"Man you're lucky. I used to try and pet my fish all the time but he'd always run away." Soos told her.

The group arrived at Tyler's office and began searching through papers. "Man this guy is terrible at organizing," Dipper said, sifting through piles of papers.

Wendy opened a drawer and found dozens of papers shoved into it haphazardly. "How did he ever get elected?"

Pacifica looked at a bunch of papers and grabbed one. "Oh! This one says that they switched water production so something called MultiCo!" She held the paper up.

Dipper took a look at it before discarding it. "Doesn't look like it gives us any clues. Probably just some mega-corporation."

Pacifica stared at it. "Well, I don't know. It seems pretty weird. Like what's with the slogan 'five heads are better than one?' And it seems like they signed it with-like-four different people."

Dipper waved it away. "I'm sure it's nothing."

Pacifica clenched her fists. "Why won't you just consider-"

"Because I already looked at it and it's nothing!" Dipper snapped.

"You barely even gave it a look! This is probably a clue!" Pacifica protested. "Why won't you just listen to anything I say?

"Because! You're just a rich kid! You don't know what you're talking about!" Dipper shouted.

Pacifica looked off to one side and stormed out without a word. Dipper reached his hand out but stopped himself.

Mabel picked up the paper and looked it over. "Dipper."

"Yeah I know I screwed up." He said.

"No. This is one of those fusion guys." Mabel told him and his eyes widened.

"We have to get back to town hall, now!" Dipper said. He grabbed the paper and the four of them ran out of the building.

Stan sat down as the town slowly regained order from the fight. Manly Dan had won without a scratch but it had still taken up quite a bit of time.

Tyler cleared his throat and started the meeting back up. "To figure out who the witch is, we've come up with multiple trials that will test everybody."

Stan could barely control his laughter. "You're kidding me? We're actually still going with witches?"

Robbie crossed his arms. "Why're you so scared, Stan? Are you behind this? You do run a 'Mystery Shack' after all."

People began to mumble and Stan seemed put off. "What? I'm not scared? I just think this is ridiculous! You all know me! I'm telling you there's go to be another reason instead of witches!"

"Are you really going to listen to some conman over an expert?" Robbie asked.

"Expert in what? And I'm not a conman! That you can prove!" Stan protested, standing up. "Think about it, if witches were trying to attack us do you think they'd just let us figure out who they are instead of causing something?"

People began to nod in agreement when the building began to shake and the lights went out. When the lights came back on multiple townspeople including Robbie had been turned into raccoons.

Stan took a look around at the remaining townspeople who were staring him down. "Look, I know what this looks like but this is just really bad timing!"

"He's a witch!" Lazy Susan shouted. "He cursed my eye to be lazy!"

"He turned me into somebody who loves hats! I hate hats!" Another person said.

"He cursed me into spending my hard money on seeing strange paintings of random colors!" A third person complained.

"No, I didn't!" Stan said.

The third person paused. "Oh wait that was a museum. You cursed me to go to a museum!"

Everyone seemed to get angrier and angrier. "He's a witch! He's a witch!" They chanted.

Stan slowly began to back up as the crowd began to surround him. "You people don't get it! I'm trying to help you! It's unicorn pee! Unicorn pee!"

Dipper, Mabel, Soos, and Wendy arrived at the back entrance to the town hall and all stopped to breathe. "Alright, guys. We just have to go in there and show them this paper and explain everything." Dipper said. Suddenly one of the eagles swooped down and grabbed the paper from his hand and dropped it into a large muscled hand.

The hand belonged to the Multitaur. He ripped the paper into pieces and grinned at them. "Sorry kids, but I have to make sure Stan is destroyed and I can't let you meddling pests get in my way!"

He jumped down and landed in front of them. All of his faces grinned at them and he flexed his large muscles.

Dipper clenched his fists. "Looks like we have to fight this guy." His voice cracked as he faced down the beast-man.

"Hey, dummy! Over here!" Pacifica shouted, standing in the center of the road holding some sort of rock. "I've got the antidote guys! After all the magic stuff took place my dad made a whole bunker of stuff and this should reverse everything!" She said.

Multitaur stared her down and charged at her. Pacifica yelped and ran around to the other side of the town hall.

Dipper and the group raced around to meet her at the back of the building and she came running around the corner with the Multitaur close behind.

She ran with the stone outstretched in front of her and tripped, throwing the stone down onto the ground next to the wall.

Dipper was about to run and grab it when she called his name. "Dipper! Don't! Trust me!" She said.

Dipper wanted to protest but just stayed still. The Multitaur scooped up the rock as he charged forward, only to crash right into the wall and punch a hole through it.

He landed in the town hall right behind Stan. The townspeople screamed with fear as he stood up and crushed the rock.

"AAARRGH! I'LL TURN EVERY ONE OF YOU INTO RACCOONS!" He held up a large container and the Gravity Falls residents cowered in fear.

Stan put on his brass knuckles and punched the Multitaur in his faces multiple times. He dropped the container and was quickly beaten down entirely.

Mabel, Dipper, Pacifica, Wendy, and Soos and into the building and everybody surrounded the man-beast.

"I told you all it wasn't witches!" Stan gloated.

"Wait but did you even transform people into raccoons and summon eagles?" Dipper asked.

Multitaur winced. "It was pretty easy. I just put unicorn pee in the water." He said with a groan.

Stan pumped his fist into the air. "Take that suckers! Two for two!"

"What is this thing?" One townsperson asked.

"Are monsters coming back?"

"Are we going to be invaded again?"

Stan looked at all the people and sighed. "No. Listen up, I mean it. We all know there's some unnatural stuff in this town. And things are getting dangerous again. I know this place and I know this weirdness. Listen to me. I can help you all be ready." People began to cheer Stan's name and he grinned.

Dipper went up to Pacifica and rubbed the back of his neck. "So. I was wrong. I'm sorry. You know what you're doing." He said.

Pacifica smirked. "That's right I do. Glad you realized it because I think after this you could use a partner. Call me next time you need a mystery solved." She said and winked at him.

Dipper's face flushed red and he coughed. "So what do we do now that the antidote is destroyed?"

Pacifica laughed. "Oh, that wasn't an antidote. That was a rock I found when I saw you guys were in trouble. I do have a bunch of magic stuff though, so I think we can cure it pretty easily."

"Wow." Dipper marveled. "You've got it all together, huh?"

Pacifica nodded and her cheeks turned faintly red. "I sure do. I had to if I was going to prove myself as worthy of being your mystery-solving partner."

"Well, you're definitely worthy. If anything I can learn from you." Dipper said and they shook hands.

Commercial

End credits

Rick whistled. "Dang. She's a beauty, isn't she?"

Ford looked the weapon up and down. "She sure is. Wonderful work everybody. I think we have a chance now." The lights flicked.

"Uh oh." McGucket whimpered.

Archer looked around. "But it's not done yet. We haven't tested it at all." He said.

Ford sighed and grabbed the large gun. "We don't have a choice. It has to be ready. They're here."