The sun was beginning to set on Gravity Falls. Dipper and Wendy has spent all day together. They hadn't meant to do it, it had just happened. After they were done fishing (Dipper could have sworn he saw something massive in the water, but Wendy had dismissed it as a shadow), they had gone bowling. Both were equally terrible. They laughed as ball after ball rolled into the gutters, and cheered when they finally managed to hit a pin or two. Once, Wendy had slipped as she was throwing the ball. Dipper managed to catch her before they hit the floor. He held her for a second, until she righted herself. They both gave an awkward chuckle, and continued to bowl. Neither knew, but both had enjoyed that little moment immensely.
On the opposite side of town, Mabel and Grenda spent time together. They went to a movie, a silly romantic comedy. They both agreed the movie was terrible, but both secretly liked it. Afterwords they went to the pool, and laid out on the chairs to sunbathe. The whole time they giggled and gossiped, talking about what they had missed over the past five years. They bonded fast, the five year absence soon forgotten. As they sun fell, the two changed back into their normal outfits, got into Grenda's massive van, and headed home.
The twins got back to the shack at about the same time. Night had fallen, and the moon was full in the sky. Dipper pulled up in his car, having dropped Wendy off back at her house. Mabel was walking towards the door.
"Wait up!" shouted Dipper. Mabel turned around, and smiled.
"Hey Dip!" said Mabel. Dipper ran up to his sister, and slung an arm around her shoulder. "Where were you all day?" asked Mabel.
"Hanging out with Wendy," said Dipper. He had a big, goofy grin on his face.
"Really? Wendy from the shack?" asked Mabel.
"The one and the same," said Dipper.
"Looks like it went well," said Mabel.
"We had fun," said Dipper. "What about you? Do anything fun?"
"I hung out with Grenda," said Mabel. "We watched a dumb movie."
"Nice," said Dipper. They walked to the front of the house, and noticed a note taped to the door. Dipper took his arm off his sisters shoulders, and pulled the note from the door. "Dear kids," he read. "Sorry I can't come home tonight. It's a long story, but we need to replace an exhibit. I will be home tomorrow. We should try to do something. Maybe see a movie. I think there's a romantic comedy out that Mabel might enjoy. Thanks for understanding. Grunkle Stan."
"Well that stinks," said Mabel. "I wanted to spend some time with him tonight."
"Same here," said Dipper. "But I guess he still has to take care of the shack."
"True, true," said Mabel. "Guess we're watching TV or something."
"Yup," said Dipper. The two walked inside, Mabel closing the door behind them. Dipper flicked the light switch, but nothing happened. "Weird," he said.
"Must have blown a fuse," said Mabel. Dipper noticed a quiver in her voice.
"You okay?" asked Dipper.
"Fine," said Mabel.
"Cause you seem a little freaked out," said Dipper.
"Nope, I'm all good," said Mabel. "Nothing to worry about. Just because it's all dark, and spooky and stuff. No big deal."
"Don't worry, I'm sure there's a flashlight in the house," said Dipper. "I'll go find it." Dipper walked away from his sister, but Mabel ran up and grabbed him.
"Wait Dipper," Mabel whimpered. "Okay, I lied. I'm scared. Something really weird happened to me today."
"You too?" asked Dipper. "Something really crazy happened to me as well."
"Really?" asked Mabel. "What?"
"Well, I was in the car-" Dipper stopped speaking. "Did you hear that?" he asked. Mabel gulped.
"Maybe it was Waddles," said Mabel.
"It doesn't sound like a pig," said Dipper.
"Then what is it?" asked Mabel. Dipper could feel her shaking.
"It's probably nothing Mabel. Maybe-" the sound came again. It was unmistakable. It was a deep, throaty growl. "Oh shit," said Dipper.
"We gotta get outta here," said Mabel. Her voice was shaky, close to panic. "Get back to the car, go somewhere else."
"It could just be a possum or something," said Dipper. "Right Mabel?" Mabel didn't answer. "Mabel?" Dipper turned to look at Mabel. Her face had turned the color of spoiled milk. He slowly followed her gaze. In the doorway of to the kitchen was a huge figure. He couldn't make out any details, only that it was so tall it nearly reached the ceiling. "What the hell is that?" Dipper whispered. Mabel just shook her head. The figure took a step towards them. The growling sound came again. It got louder as the thing got closer. The thing took another step into the living room, and a beam of moonlight hit its face. It was covered in fur matted with mud and gore. It had long teeth, with foaming spit running down its jowls. Its eyes were yellow, the pupils pitch black. It stunk bad. The smell began to fill Dipper's nostrils, nearly making him gag.
"Oh no," said Mabel. "Oh no, oh no, oh-" the thing leaned its head back, and let out a howl. Both Dipper and Mabel clasped their ears. The volume of it shook the walls. A single crack appeared in the window, skewing the moonlight that slanted on the beast. It got on all fours, and tensed itself up.
"Run!" shouted Dipper. He grabbed his sister by her arm, and booked it out of the shack. The werewolf ran after them, its growl now a roar. Dipper ran out the door, and slammed it behind him. The werewolf smashed into it. With a crash, the door flew off its hinges. Dipper and Mabel continued to run towards the car, both of them breathing hard. The thing stood on the porch of the shack. It raised its head and unleashed another howl. Dipper finally reached the car. He put his hands in his pockets, trying to find his keys.
"Hurry Dipper!" screamed Mabel. The werewolf had bounded off the porch, and was sprinting at them. Dipper looked in his car window, and felt his heart drop into his stomach. His keys were still in the ignition. He had locked himself out. He turned towards the wolf, and things started to go in slow motion. The thing came towards them, blood and spit streaming from its mouth. Mabel was screaming, raising her hands in front of her face. But Dipper was not afraid. Instead, he was filled with a sense of calm. He closed his eyes, and a vision filled his head.
He was sitting with Mabel. They were both twelve. They were bruised and bloodied. Mabel had a huge gash in her cheek, and a slash from her hip to her knees. Dipper looked like he had been skydiving without a parachute. The two leaned against each other. Dipper held a book in his hands. He wrote in the back of it. 'If you ever have need of me, simply call, and I will appear.' The vision faded, and Dipper knew what he had to do.
He opened his eyes, and whispered, "three." He looked in his hands. The three book was there, its pages open. "MOVE!" said Dipper. He grabbed Mabel, and whirled her out of the way. A huge clawed hand missed her face by inches. He fell to the ground, and reached into the book. He felt something leafy in his hand. He pulled it out, and stood back up. The werewolf turned to greet him. It opened its mouth, and lunged. Dipper threw the thing in his hand at the werewolf. It landed in its open jaws. The beast gasped, and began to moan and thrash.
"What's going on?" asked Mabel.
"Wolfsbane," answered Dipper. The werewolf continued to moan and convulse, until it vomited violently. It collapsed, and was still.
"Did... did you kill it?" asked Mabel. Dipper looked in the book. It was open to the page on werewolves. He read it quickly.
"No. It says here that wolfsbane calms it, and causes it to become a human again," said Dipper.
"Wait, where did you get that book?" asked Mabel.
"I don't know," said Dipper. "I kind of wished for it, and it was here."
"I recognize it," said Mabel. "I feel like it's important."
"Look!" said Dipper. He pointed towards the werewolf. It was changing shape, contorting back into human form. "That looks painful," said Dipper.
"Wait a minute," said Mabel. "He's starting to look familiar."
"No way," said Dipper. "It can't be." The werewolf had become human again. He got up, and shook his head.
"Dude, where am I?" asked Soos.