"Hold on everyone!" Ford instructed, he took out a device and pressed a few buttons. A small ship flew up from the forest and caught them all.

"Whoa! Ford is this one of the alien ships?" Dipper asked in disbelief.

"Yes it is Dipper. I finally managed to reprogram it." Ford answered.

"Alien ship?" Mabel asked, a confused expression on her face.

"See this is why I'm glad you're back. I don't know half the stuff Ford talks about." Stan said. The ship landed and they got off of it.

"Now we must get to the lab. It appears Will has already begun his worldwide Oddmaggeden." Ford said.

"We'll stop him! These Ciphers never learn that you don't mess with the Pines and with Earth!" Dipper said.

"Yeah! I'll bedazzle his face!" Mabel cheered.

"Alright Soos. You and me are going to make sure everything is in order at the shack. Let's go." Stan said, walking off. Soos followed him.

"Yes Mr. Pines!"

"Alright kids. We need to get to the lab so we can decipher the Zodiac." Ford stated. Just then a bright light shone, blinding them all. When it died down Nate and Whisper was standing in front of them all.

Ford pulled out a laser gun and pointed it at Whisper. "Who are you and what are you doing!"

"I-I'm Nate Adams." Nate said, putting his hands up.

"And your egg?" Ford asked, motioning to Whisper.

"I'M NOT AN EGG!" Whisper shouted.

"You do look a lot like an egg dude." Nate said.

Whisper gasped. "Nate how could you! Betrayed by my own master!"

Nate sighed. "You're so over dramatic."

"Answer the question!" Ford demanded.

"I'm Whisper if you must know. Wait how can you see me?"

"Maybe he's a Yo Kai. There seems to be a lot of them pretending to be people back in Springdale." Nate suggested.

"Yo Kai..." Ford looked at Dipper and Mabel, who were speechless after watching Ford, Nate, and something seemingly nonexistent converse. "Oh that's why you two are so confused."

Ford took out his machine and pressed some more buttons, a purple beacon of light shot up from the mystery shack for a moment before dying down.

Dipper and Mabel blinked and now saw Whisper floating there. "AHHHH GHOST! DON'T MAKE ME WOOD!" Dipper screamed.

Whisper looked offended. "I'm not a ghost, I'm a Yo Kai."

"Dipper this isn't even the weirdest thing we've seen. Hi I'm Mabel, and that's my paranoid dork brother Dipper, nice to meet you. Only a few questions. What's your name? How come we can see you now? What's a Yo Kai? Why could Gruncle Ford see you before? And why does Gruncle Ford know what Yo Kai are?"

"I'll answer the first few. I did a study on Yo Kai. There aren't many here but they were interesting enough so I got my hands on some Yo Kai lens and put it into my glasses.

You can see them now because I created a device in the lab that would allow such a thing if Bill or another enemy teamed up with Yo Kai. Since they aren't tangible unless they're seen and could be a destructive force."

"And to answer your other question I'm Whisper and I have a video prepared for just this occasion." Whisper said, taking out his Yo Kai pad.

"I don't remember a video." Nate said.

"Well my Yo Kai pad was out of power when I met you. Those capsules don't have chargers you know." Whisper pressed play on a video.

Sgt. Burly appeared on screen. He was a very buff man with orange skin. "So you've learned about Yo Kai and you don't understand? Well let me explain." Sgt. Burly began doing sit ups. "It's all. Very. Simple! Feel the burn!" After about an hour his video concluded.

"Dude it would've taken us maybe ten minutes to just do it ourselves!" Nate pointed out.

"Well I haven't got to use the video!"

"Well that was informative." Mabel decided.

"So wait, nothing is our fault and it's just you guys?" Dipper asked.

"No no you still do plenty of things wrong on your own. We simply 'trigger' these emotions or feelings, or sometimes we 'strengthen' them." Whisper explained.

"Yes this was all very educational. But I must know, why in the world did you two decide to come here?" Ford inquired.

"Well Will mentioned that this place was protected so we figured we could find help stopping him." Nate said.

"So you also wish to stop Will? What was your encounter with him like?"

"Yeah did he try to offer you deer teeth?" Mabel asked.

"Or trick you into becoming a sock puppet?"

"Uh no none of that." Nate was hesitant to tell the story but he explained his time with Will. "And that's it. It's all my fault."

"Nate no it isn't. The Yo Kai pad-I mean I had very little knowledge on him. There was no way we could've known." Whisper comforted Nate.

"Yeah don't worry about it. It was my fault Weirdmaggeden started because I was tricked too, but everyone forgave me." Mabel said.

"Thanks... uh Mabel." Nate smiled faintly.

"Then it is decided! We must work together to defeat Will. Now, let's go to the lab!" Ford said.

"Not ssssso fassst!"

"You're back again!" Nate complained.

The boss Yo Kai Slimamander was standing above them all, laughing away. Slimamander was a giant quadruped with three mouths. In his first mouth was a giant purple eye, in the others tongues hung out of them. Slime dripped from all over him.

"Agh a hydra!" Ford took out his gun, Dipper produced a book he had pocketed, and Mabel room out her grappling hook.

"No Eyedra issss my cousssin! I'm Ssslimamander!" He hissed. Nate readied his Yo Kai watch.

"Who do I call? Venoct beat him last time but he was weakened then. The other time we had Venoct on our side again." Nate said.

"Well you better hurry up and decide." Whisper said. Before he could decide a giant serpent-like creature jumped from the woods and landed on Slimamander. The two struggled for a while, Slimamander spewed flames from his mouths and tried to hide his eye but the monster continued to attack him.

"Wait is that the gobblewonker?" Dipper wondered.

"Impossible! The gobblewonker needs water to survive!" Ford said.

"Not the one we know." Mabel said.

"Gobblewhat?" Nate looked completely lost.

"Get 'em gobblewonker!" A familiar hillbilly with glasses and a giant white beard ran out of the woods with a controller in his hands.

"Fiddleford you made a gobblewonker replica? My it looks so real I could've been fooled!" Ford awed.

"It did fool us for a while." Dipper murmured.

"Oh howdy friends! Howdy new guy! Howdy floating egg! I'm Old Man McGucket!" He waved.

"Do you gunk old man McGucket could see Yo Kai before you turned the machine on?" Dipper asked.

Ford shrugged. "I have no idea."

"Why does everyone think I'm an egg!" Whisper griped.

Finally the gobblewonker and old man McGucket backed off once Slimamander had been defeated. They left to go to who knows where.

"Ok. I concccccede. You've won ussssing the old man. I'll even give you my medal if you promisssse not to call him again." Slimamander offered.

"Sure, it's a deal." Nate said. "But I didn't even know you a medal." The medal appeared in front of Nate and landed in his hand. Slimamander dissapeared in a purple cloud.

"Now before there's another distraction, we must go to the lab!" Ford insisted, the group followed him towards the Mystery Shack.

Will stared at the crystal ball image of Gravity Falls. The image fizzled out and Will smashed the ball

"Worthless thing! It seems that the seal protecting them is much stronger than I originally predicted. Perhaps I need to send in my backup plan." Will looked over his giant castle in the center of the Earth. The only thing keeping it from causing massive issues to Earth was his own powers.

The castle was in the shape of a giant square pyramid. Everything was made from obsidian and lit by green flames on torches. Will's Yo Kai allies milled about along with the Williams.

"I need to get to them to figure out how to break the seal on the ice containing the last of my power. Then I'll finally be able to claim the universe. For now I'll have to call on one of my strongest allies and one of the greatest enemies of them." Will laughed evilly befor remembering something.

"Wait a second that reminds me! McKraken!" Will teleported over to the prison holding Chairman McKraken.

"Boss I sea why I'm getting punished but being stuck here is krillin me!" McKraken shouted, his arms chained.

"I assume Tim has been giving you what you deserve. You failed me McKraken. To think you were a threat to this world... tisk tisk tisk. I cannot have weak links in my chain holding up the wrecking ball. If I do then do you know what happens?"

"Wi-will please-"

"They break! And the whole thing falls down! Because of one weak link!" Will's eye flared with rage. "You had your chance McKraken, now it's gone. Goodbye." Will snapped his fingers and McKraken vanished. "Forever."

Will returned back to his room in the castle. "Tim get over here! We need to bring back my brother, Bill Cipher."