Nate woke up in a place he found far too familiar. "Wicked Springdale."

Dipper looked around. "I don't see what's so different about this place, other than all the smoke everywhere." Black smoke seemed to cloud everything from vision.

"This isn't any smoke. It's the kind that fuels the Wicked Yo Kai's power. They inspirit people and Yo Kai and make them evil." Nate said. "At any point we could be controlled by them, nd without my Yo Kai watch or any of our friends I can't fight them off. We probably can't even see them."

"Wait." Dipper dug into his bag and pulled out a device. "This was something I found in Ford's lab, a prototype of a smaller version of his machine that makes Yo Kai visible. I hope it works." He pressed a button and the device hummed to life.

"Did it work?" Nate asked.

"Oh my swiiiiiirls!" Komason's voice shouted in the distance.

"Seems so. Now let's go help him." Dipper and Nate ran off to the source of the shouting.

Katie awoke to find herself in a small triangular jail cell. There wasn't any way to view what was on the outside, and the only light was produced by a small bulb hanging from the ceiling. "Nate's in that world of Wicked Yo Kai while I'm forced to be trapped here in this stupid cell, I hope he's OK."

"Nate'll be fine." Mabel's voice said, Katie turned to see Mabel sitting against the wall behind her.

"Mabel, I didn't know you were here."

"I've been here for a while and I've been thinking of an escape plan. Now that you're awake it should work. We bust out and find the Yo Kai and you convince them to fight back and then we beat down Will and rescue Dipper and Nate." Mabel said.

"Alright but how are we going to get out of here?" Katie asked.

Mabel frowned. "Well I figured you'd come up with that part. No big deal, they forgot to take something of mine that'll save us." Mabel stood up and turned to the wall.

"What's that?"

"My grappling hook!" Mabel held it up and then pointed it at the wall.

"Mabel I'm not sure that's a go-" Mabel fired the grappling hook, the hook ricocheted off the wall into the light bulb. The bulb broke, destroying their only source of light. "Smooth."

Nate and Dipper dashed through the city, avoiding Wicked Yo Kai and people inspirited by Wicked Yo Kai.

"Y'all better stay away!" Komason was pinned against a wall, two Wicked Yo Kai were looking over him grinning.

"Hey you guys! Leave him alone!" Nate shouted, shoving them away.

"Well lookie here it's the boy who foiled our plans. This time we know you don't have any Yo Kai, so we're going to finish you." One of them said, his name was Schemer. He looked like a humanoid boxer with pitch black skin. The other one was Loiter, he was a giant black snake-like creature with a giant mouth full of sharp teeth.

"What are you talking about? We have Komason." Dipper reminded them, they burst out laughing.

"Please! That wuss hardly counts as a Yo Kai!" Loiter said.

"Komason let's prove them wrong, here we go!" Komason nodded and ran in front of Nate. "Spirit dance!" Blue energy swirled around Komason and then he absorbed it. Suddenly flames ignited around both Loiter and Schemer and they ran away.

"Alright, that solves that problem. But now how are we going to get to Mabel and the others?" Dipper wondered.

"We could use Mirapo?" Komason suggested.

"Great idea but I don't have my Yo Kai Watch." Nate said.

"I know that. But you don't need any watch to summon Yo Kai! Nate I've been your friend for a long time and in that time I've seen a lot of things, you've done some great deeds and helped a lot of people and Yo Kai. Your grandpa was able to summon his watch, and you'll be able to as well. You'll lead us into battle and I'm sure that you'll help us win!"

"K-Komason that's so nice." Nate nodded. "Right. I'm not going to give up! Not now and not ever! But if we want to win we're going to need the Wicked Yo Kai's help."

"How in the world are we going to do that?" Dipper asked.

Nate grinned. "Just follow me!" Nate turned and ran for the school, Dipper and Komason raced after him.

"We're never going to get out of here." Mabel sighed, sitting down on the floor.

Katie sat down as well, she began thinking back. Not only to her short time spent at Gravity Falls but all the adventures she'd shared with her friends. Katie clenched her fists and shot up.

"No we can't give up! Not now and not ever! No matter what we can't quit. We've been through so much, so many challenges. You know there's another way! There's always another way, like using cherry blossoms to hold back an evil squid dictator or... um."

"Or turning a shack into a fighting machine to beat up an evil demon!" Mable supplied.

"Exactly! Wait what? Never mind I shouldn't be confused by that. We'll find another way! We always can and always will!" Suddenly Katie's watch reappeared around her neck. "Whoa. Alright, let's call in some friends!"

Nate dashed to the roof of the school, standing at the edge. "Here goes nothing." He took a deep breath. "Hey everyone listen up! I know you all probably hate me and it makes sense, we're enemies! But I'm not your biggest threat! Right now all of you could easily defeat me, but you could also defeat Will as well! Being at risk of having yourselves destroyed at any moment in time, meanwhile all I can do is foil your plans! I'm not asking for your friendship, just your understanding! Let's work together to defeat Will! Because to be honest, we all know he's looking for an excuse to blow this place to bits!"

Suddenly in a glow of bright light Nate's watch reappeared on his wrist.

"Well sure, I don't really see why not!" Schemer said, all of the Wicked Yo Kai muttered in agreement.

"Alright then, time to call Mirapo! Let's finish this once and for all Will, I hope you're hearing this because we're coming for you!" Nate put Mirapo's medal into the watch, summoning their mirror friend.

Will crushed the crystal ball. "Tell me Bill, what do you plan on doing about their little uprising?" Will turned to Bill, who was sitting next to Ford. Ford was still in chains.

"Look Will there's no need to be hasty..." Bill said.

"You can't break the deal, but I can. So deal's off Bill! I'll blow those kids to kingdom come and just keep you locked up! Oh this'll be so much more fun! Tim!" Tim appeared next to Bill. "Ready the Williams, we're going to war against the Wicked Yo Kai."

"Yes Will!" Tim saluted and vanished.

"I'm going to make each death painful, especially Komason's. What torture method sho-" Will was hit back by a fireball from Bill. Bill then broke Ford's chains.

"Alright Ford you've gotta find Katie, Mabel, and the rest of the Yo Kai. Good luck." Bill transported Ford away before he could respond. Will recovered from Bill's attack and laughed.

"We already went through this Billiam. Prepare to die!" Nate, Dipper, Komason, and the Wicked Yo Kai were warped to the prison section of Will's castle, just then Kyubi broke down the cell door.

"Thanks Kyubi." Katie said.

"My pleasure." Kyubi bowed.

"Katie!" Nate ran up to her and hugged her.

"Dipper!" Mabel ran up to her brother. Ford suddenly appeared in front of them.

"Great Uncle Ford!" The twins shouted and they embraced their great uncle.

"I'm so glad you kids are OK. I just need to know, is Bill a good guy now?" Ford asked.

"We'll catch you up later. Right now we have to find the missing Yo Kai." Dipper said.

"I have the perfect solution. Before my Yo Kai watch wouldn't work no matter who I tried to call but now it will! I know it!  Alright Yo Kai! Come on over! Calling the army! Yo Kai Watch show them what you've got!" Nate shouted taking out his special medal and placing it into the watch. The watch exploded in light.

"SUMMONING ARMY! YO KAI ARRIVE! VICTORY WE STRIVE! WE SHALL WIN LET'S BEGIN! YO KAI!" The watch boomed, all of Nate's Yo Kai friends were brought to the room and Whisper was too.

"Oh Nate I'm so happy you're back I knew you'd return and save us!" Whisper said.

"Nyo he dyidn't! Whisper was syure you were gyone forever!" Jibanyan protested.

"Jibanyan!" Whisper glared at him.

"You two never stop fighting." Katie sighed.

"I'm really glad there isn't two of them." Nate said.

"Kids, I want you to know how proud I am of you both. Wait, where's Stanley?"

"Right here!" Stan shouted, riding in on a golf cart with Soos and Wendy on board as well. "Bill transported us here from Gravity Falls. Let me tell you it isn't looking good, but we're ready to fight!"

"Here we go dudes. This time I get to axe a bunch of mini Bills!" Wendy said.

"Actually Bill's on our side now." Dipper said.

"Plus they're purple and Bill is yellow." Soos spoke up.

"Doesn't matter! Here they come!" Mabel broke in.

"Alright everyone. This time we're going to win the fight! We have to get to Will, find Bill, and form the Zodiac. Everyone stick together! Let's do this!" Nate shouted, the Yo Kai cheered in response. Just then Tim and the army of Williams rounded the corner.

"Time to finish this once and for all!" The two armies charged at each other for the final confrontation.