Disclaimers: I do not own Gravity Falls

Author's Notes: Next Chapter is up! Thanks for reading and please review.

(Back with Bill…)

"Run, guys! Run!" Mabel yelled.

Mabel, Bill, and Dipper were attempting to escape Tad and his monster army. Bill fired off some fireball blasts to buy them more time, as they eventually made it to Ford's underground tree bunker deep in the woods.

"Okay all terror aside." Bill said. "Where are we?"

"It's an underground bunker." Dipper said offhandedly as he looked for a weapon. Unfortunately all he managed to find was lab equipment and some tools that Ford and his partner Fiddleford left down there when they were doing repairs. Usually the bunker itself was lock down, this was because one of Ford's early discoveries, a shape shifter had escaped it's cage and terrorized the twins. Thankfully the twins had trapped it in ice, but Ford still changed the access codes in fear that something else down there would hurt them.

Thankfully Dipper was pretty good at figuring out Ford's access codes.

"No dip Sherlock." Bill retorted. "I mean, why is it here?"

"Oh Great Uncle Ford created it for the impending Dooms Day." Mabel answered. "You know when the monsters of Gravity Falls come out of hiding and take over."

"Or if a certain demon family decides to erase all mankind from existence." Dipper added.

"Seriously?" Bill exclaimed. "The nerve of some people!"

"Can we focus here?" Dipper instructed looking around. "It's going to take a while for them to get in here, so we should use this time to prepare." He placed his hand to his chin thoughtfully "We're gonna need to build some armor," Dipper said. "Now where does Ford keep his blowtorch?"

"Dipper…" Bill tried to get his attention.

"What I'd like to know is how they knew where we were." Mabel said.

Bill bit his lip nervously.

"What do you mean?" Dipper asked as he took a welder's mask off of one of the shelves and placed it on. He stops as he noticed the blowtorch. "There it is." Dipper closed the welder's mask over his face and activated the blowtorch. Meanwhile Mabel began handing him objects which he started welding together into armor.

"Think about it bro." Mabel insisted. "Tad just happened to be in the woods and came across us while we were trying to catch some beard cubs. Doesn't that sound fishy?"

Dipper paused, he had thought that was weird. Ford had sent the three out in the woods to collect some hair samples from some beard cubs. These were creatures that looked like living beards. Ford wanted to see if their hair had any similarities to actual human hair. Ford often sent them on solo task such as these to help them home in on their skills. He would always say it was good practice for when he and Mabel finally took over the family business. And the only reason Tad could be out there was for them, but how did he know exactly where to find them, or that they were in the woods in the first place?

Dipper noticed Bill's nervous look and gave him a stern one of his own. "Bill is there something you would like to share?"

"Umm, this may be all my fault," Bill replied.

"Wait, what? What did you-" Mabel began, before screaming as an arm punched through the ground above them. Three-Eyed Potato Baby started peeking inside the hole. Bill used a spell to punch it in the peering eye.

As the creature retrieved Dipper decided to get to the point. "What. Did. You. Do?" He demanded.

Bill sighed. "Look, do you remember when you and Mabel were having that really bad day?"

"Ugh. Don't remind me." Mabel added. "Actually Dipper had it worse, admittedly."

(A Few Days Ago…)

It was early morning and Dipper had missed the bus and was running to try and catch up with it. Bill opened a window and waved at Dipper.

"Look at you, jogging to school. In the zone!" Bill said. Of course he was teasing.

"I'm trying to catch the bus!" Dipper panted.

"Well maybe if you woke up early enough." Mabel said from the window beside Bill's.

"Someone turned off my alarm!" Dipper screamed.

Bill laughed. "Oops is that what the button does? Silly me, human phones are just so different from mirror phones."

"Bill!" Dipper screamed.

The bus suddenly stopped, and Dipper ran right into the bus's "stop" sign.

"Who punched my bus? Who does that? Bus never did nothing' to you," the driver said.

The door then closed trapping Dipper's sleeve, and the bus started moving again, taking Dipper with it. When the bus hit a speed bump, Dipper's shirt ripped right open, and he was tossed right into some trash cans. He got up, now with a black eye.

The bus came to a stop beside him and Mabel raced off to help him. "Dipper!" She exclaimed digging into her bag. "Here I brought an extra shirt!" She handed it to her brother, who quickly put it on without even bothering to look at what was on it. A moment later he wished he hadn't as some jerk on a bike noticed Dipper - or specifically, his shirt which showed his sister kissing a boxer on the cheek with the caption "Mabel Kissed a Boxer at Boxingkon 2012".

"Woah… Heh ha, ha, ha, ha! You kissed a boxer!" he laughed.

Dipper then grabbed a nearby newspaper and decided to wear it like a shirt, covering his actual shirt, out of embarrassment.

The guy continued laughing then stopped suddenly and rode off.

"Mabel! Couldn't you have picked a different shirt?" Dipper complained as Bill joined them.

He winced as he noticed Dipper's condition. "You okay Pine Tree?"

"Yeah, I'm fine," he replied, before he noticed a nearby flier on the wall.

"Ugh, you gotta be kidding me. School picture day?" Dipper groaned.

A girl with a camera walked by, and said "Smile!" and snapped a picture of Dipper.

"Ugh, I wanna go home," Dipper groaned louder.

"Hey, maybe the rest of the day will be better," Mabel said, trying to cheer him up.

"Well, well, well!" Mabel suddenly froze as Gideon walked up to them.

"Not today, Gideon," Dipper said.

"Yeah, Dipper's had enough of a bad day already. Leave him alone!" Mabel added.

"Actually." Gideon blushed. "I was hoping to speak with you." He said hopefully.

"Oh." Mabel was shocked, she and Gideon hadn't spoken directly since they had broken up last year.

"I was hoping you could give me the honor of having you as my date for the dance this Friday." Gideon said hopefully.

Mabel suddenly looks like a deer staring in the headlights. "Uh I would love to…"

"Great I'll see you after school so we can discuss our matching outfits!" Gideon jumps for joy.

Mabel was too stunned to say anything, meanwhile Dipper suddenly smiles.

"The dance?" He asked out loud. "I almost forgot about it." He admitted. Maybe Mabel was right, maybe his day was looking up.

"Like anyone would go with a dork like you." Gideon teased.

"Gideon for the last time I said leave me alone!" Dipper screamed stomping his feet - right onto Wendy's skateboard.

"Ooh-ho-ho-hooo!" Gideon taunted.

"Dipper… You broke my skateboard," Wendy said disappointed.

"Wendy, I-" Dipper started.

"Its fine, dude," Wendy interrupted. "I'll just live with it."

She then tried to roll off with just half of her skateboard.

"I think my work here is done," Gideon said. "See you after the final bell." He added to Mabel before running off.

"Well, that was a great start for today," Bill said sarcastically.

Dipper and Mabel both shared an agonizing groan.

(Back To Present Events….)

"Okay so we had a bad day." Dipper said as he put a fake skeleton's head into a vice. "But what does that have to do with right now?"

"I'm getting to that," Bill replied, and Dipper started to saw the head off.

A monster broke through the ceiling once more, and began to reach around, trying to grab one of them. Dipper freed the skull head from the vice and put it within the monster's reach. It grabbed the head, breaking it off leaving just the base.

"Thank you!" Dipper called out, then shoved the vice into the hole, blocking it.

"Anyways." Bill continued. "That's when Mabel met Oskar," Bill continued.

"Oh right. Crazy key-tar dude," Dipper said and then shuddered.

(Two Days Before…)

All around the school, yelling and screaming could be heard as a horrible key-tar melody was heard playing. Everybody rushed to protect themselves from the audible torture.

Well, everybody except Mabel, who was in a trance. She pulled Dipper's noise-canceling headset off which was blaring 8-bit video game music. He had been trying to study and with all the racket he needed something louder to drown it out.

"Mabel!" He exclaimed.

"Who is that fresh of breath air?" Mabel asked pointing to a kid who was jamming on his key-tar as he sat on top of his car.

"Oh, that guy. He's Oskar Greyson." Dipper said." "Remember he's the kid who dropped out last year and now lives in his car"

"That's him?!" Mabel exclaimed "No way!"

"I'd keep my distance. That guy has a record," Dipper replied.

"Sounds like my kind of guy." Bill joked.

"Oooh, a record!" Mabel said, infatuated, and ran towards him.

"Not that kind of record, Mabel!" Dipper yelled, but Mabel ignored him.

Mabel was almost to Oskar when Gideon cut her off.

"Mabel, my little marshmallow why didn't you meet me after school yesterday?" He asked.

Mabel panic and blurted out. "Because I already have a date." She said frantically. As she saw Oskar was getting in his car to leave.

"Oh…" Gideon looks stunned.

"I tried to tell you." Mabel lied.

"Well I guess I got a little ahead of my…" Gideon began.

Mabel pushed him aside as Oskar started his car. "Yeah that's nice." She pulled out a sticky note with her number on it and gave it to Oskar. "Call me!" She screamed loudly over his blaring radio.

Oskar nodded and drove away.

(Back To Present Events….)

Mabel sighed. "I guess I'm just not cool enough for a guy with a record," She said sadly.

"Are you kidding? You're the coolest girl I know," Bill assured her. "Anyway Mabel eventually got over the fact that Oskar was never going to call. But Pine Tree you were really bummed out. So I tried everything to cheer you up!" he explained.

(Two Days Ago… Again!)

After what happened with Wendy, Dipper had decided to hide in his room forever! Bill of course was feeling bad about everything. He couldn't help but feel that his little alarm clock joke caused this in one way or another. So while wearing a large fake mustache he started juggling a few of the laser puppies.

"Huh? Huh? Huuuh?" He asked Dipper hopefully.

Dipper's expression remained unchanged.

Bill dropped the puppies and decided to gather reinforcements.

Next he had Mabel hold a glass of water and then using his wand he made it suspend in midair, splitting the large droplets into multiple pieces and made them change into random colors, even freezing a few of them.

"Look Pine Tree I've been practicing." He said. "Just like you taught me."

Dipper was not impressed at all, but Mabel applauded like crazy.

Seeing that Dipper still wasn't phase Bill decided to use more drastic measures.

He took Dipper's hat and pulled out a fish. "Ta-da!" He yelled.

The fish then swallowed Bill's head, and Mabel rushed to try and free him, before Bill tripped and fell, allowing the fish to swallow him whole. Finally Mabel's hands slipped in the process, launching her into the wall.

This made Dipper laugh hysterically, and Mabel and Bill joined him in laughter.

"I'm in a fish!" Bill said, still laughing.

After that Dipper decided to face his mistake and apologize to Wendy. His hope was that she would forgive him and go to the dance with him. So after school, he saw her by her locker.

'This is it.' Dipper thought. 'Your chance to show Wendy how you really feel.' He walked over and noticed her new board. "Hey you got a new board." He told her in surprise.

"Yeah I've been wanting this one for a while." Wendy admitted. "But my dad wouldn't get it because mine was perfectly fine." She revealed. "Now thanks to you I finally got it."

Dipper smiled. "That's great!" This was it, in a series of unforeseen events breaking her board turned out to be a good thing! Which meant…! "So Wendy I was wondering if you wanted to go to the dance together?"

"The dance?" Wendy asked.

"As friends!" Dipper added fearfully.

"Oh dude sorry I'd like to." She admitted. "But I already have a date."

"Oh?" Dipper asked.

"Yeah, Mikey from fifth period asked me." Wendy added, but Dipper was no longer listening.

(Back To Present Events….)

"After that none of my normal methods could cheer you up." Bill went on. "I had only one idea left…"

"So, you brought these monsters here to cheer me up?" Dipper asked.

"Aw that's so sweet." Mabel said.

"Are you kidding?" Dipper argued. "There were at least 15 hundred things you could've done besides that!"

"Well, I didn't expect so many to show up," Bill explained, before putting a bucket as a helmet on Mabel's head. "But don't worry! This armor you're making will definitely hold them off!"

Suddenly the ground above them is ripped right off, and several monsters grabbed Bill, Mabel, and Dipper, causing said "armor" which was really just a bunch of things laying around the bunker - to fall off in the process.

"Give it up, Bill! You're outmatched!" Tad yelled as the monsters placed them before him.

"Tad, what's with all these new monsters?" Bill asked.

"What? These are all the same monsters I always bring!" Tad replied.

"Well, I don't recognize any of these guys," Mabel said.

"I've never seen this dude in my life," Dipper added pointing to Man Arm.

"You mean you've never met Man Arm?" Tad asked. Man Arm, a fish like creature turned and waved his humanlike right arm, and said, "Hey."

"Surely, you know Spike Balls," Tad continued.

Spike Balls approached Dipper and he took one of the spikes and shook hands using it. Spike Balls greeted Dipper, "Hi, I'm Spike Balls. I'm usually in the back."

"Now that you all know each other... Get the wand!" Tad yelled.

The monsters attacked and the three charged into battle, with Bill leading off with a Fire Fist Punch right to the two headed monster's chest. Mabel followed up a drop kick to Man Arm who Dipper finished off with a round house kick in the gut.

Bill then raised her wand, "Honeybee Tornado Storm!"

Bees began swarmed Tad's army, some of them stinging the monsters. A nearby flower monster seemed to really enjoy it though…

"You were right, Bill! I'm totally cheered up!" Dipper said, as he delivered several jabs to a chicken monster.

Bill smiled. "Then my work here is done." He declared firing off a Narwhal Blasted at Tad.

"Wait you called me here to cheer up a stupid human?" Tad exclaimed. "I thought you wanted to end this once and for all?"

"Oh I do." Bill said.

Suddenly Mabel's phone rang,

"Space unicorn! Soaring through the stars! Delivering the rainbows..."

"Ugh! What is that horrible ringtone?" Tad asked.

Dipper, who was in a headlock from Man Arm, replied, "Mabel answer your phone!" he always hated that annoying ringtone.

Mabel pulled out her phone and gasped. "It's Oskar!"

"Well, answer it!" Bill said.

"Oh, right, right!" Mabel said. "She answered. "Hi."

"Sup." Oskar said. "Sorry I took so long, been trying to break the record of longest song jammed" He explained.

"Oh." Mabel said.

"So what did you want to talk about?"

"Well I know you don't go to our school anymore, but would you go to the fall dance with me?"

"Sure." Oskar answered. "See you there."

"Kay." Mabel said trying to keep her excitement in.

"So…" Oskar trialed off. "Cool."

"Yeah." Mabel giggled. "Call you later."

"Awesome." Oskar answered and hung up.

Mabel screamed. "I have a date!"

"Good for you!" Bill laughed as he dodged a blow from Tad.

"Like it matters." Tad yelled, gasping for breath. "You're end starts now!" He shouted.

Suddenly Dipper's phone rings as well.

"Seriously does this battle mean nothing to you?" Tad offhandedly commented as Dipper answered.

"Hello?"

"Hey Dip it's me." Came Wendy's voice.

"Hi." Dipper mumbled.

"Who is it?" Bill asked.

"It's Wendy!" Dipper whispered happily.

Bill smiled evilly. "Well what are the odds?"

"So this is really embarrassing." Wendy went on. "But do you remember Mikey from fifth period?"

"Yeah." Dipper answered.

"Well he totally flaked on me." Wendy exclaimed. "And now I don't have a date and all my friends are going!"

"Oh." Dipper wasn't sure what to answer to that.

"Yeah Tambry and Robbie are going and Bill is going with Janna." Wendy explained. "Even Lee and Nate have decided to come out at the dance."

"Awe good for them." Dipper said and then froze looking at Bill. "You're going with JANNA!"

"She's cool." Bill said delivering another spell.

"She's creepy." Dipper yelled.

"Exactly." Bill grinned.

"Anyway I was hoping we could still go together." Wendy continued.

"Hoping?" Dipper asked.

"It's okay if you're already…" Wendy began.

"No I'm not!" Dipper yelled.

"Smooth." Bill joked as he dodged another blow from Tad.

Dipper glared at Bill before he took a deep breath. "I mean I would love to go with you." he said.

"Cool, later dude!"

Wendy hung up.

Dipper sighed.

"So how did it go?" Bill asked slyly.

"Perfectly." Dipper answered, then added. "What did you do to Mikey?"

"I'll never tell." Bill cackled evilly.

Suddenly a monster threw a tree towards them.

Dipper screamed, but Bill managed to stop it in time with a wave of his cane.

"HEY! We are talking here! YOU MONSTERS ARE SO RUDE!" Bill yelled.

"SYRUP TSUNAMI SHOCKWAVE!"

Bill's spell covered the area with syrup, pancakes, and waffles leaving his enemies in such a sticky mess that they couldn't move.

"Well now that that's over." Mabel said. "Let's go shopping."

Dipper looked at his watch and shrugged. "Sure we got time."

"So exactly what are human dances like anyway?" Bill asked.

"Hey I'm not finish with you yet!" Tad yelled trying to break free.

"You guys hear something?" Bill asked giving Tad a sneer.

"Nope." Mabel and Dipper said together before the three started their journey back to civilization.

-To Be Continued