Tanaka practices using a samurai sword outside, while the TV plays the news inside.

"Naval authorities report that the research vessel Seahawk is missing at sea. Rescue teams are combing the area for its last known position. So far, there are no signs of the vessel. These pictures were taken two days ago when it left on its mission. Details of that mission are being kept secret, but sources tell SSTV that everything seemed to be going well until early this morning when the crew radioed to report heavy fog."

Chris, Chuck, Sonic, and Y/N are watching the news, while Tails is playing a game of Jenga with Cream and Cheese.

"See? That's why I can't stand water." Sonic said who still have fear of water.

"Oh give me a break." Y/N rolled her eyes.

"You like it if it's in a glass. That's a start." Cream said.

Sonic displays many sweatdrops, causing Tails to crack a smile and Y/N to snicker.

"Maybe the ship hit something after it went into the fog." Chris guessed.

"A ship like that has instruments that let it nagivate through fog safety. There may be something else going on here." Chuck said.

"What do you mean, Grandpa?"

"What if Seahawk's disappearance wasn't an accident? Other vessels have encountered strange phenomena in that area. Perhaps we should take a yacht and have a look..."

"Does that mean you're going out on the ocean?" Cream asked.

"Yes, that's possible."

Cream's eyes shimmer with unshed tears.

"You're thinking that Emel's down there somewhere." Chris frowned.

"Hey, Cream! I'm gonna go outside and pick a whole bunch of flowers. Wanna join us?" Sonic said as Y/N nodded along.

Cream smiled.

"Sure! We can give them to my mom and Ella."

"Chao chao!" Cheese said.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A car pulls up at the front of the mansion. Ella answers the door to see that her visitors are Knuckles and an adult human with a tan complexion, short grayish brown hair, and gray eyes. For attire, he wears a maroon jacket and trousers. Underneath his jacket, he also wears a black shirt.

"Ah, hello, Knuckles." Ella greeted.

"Very nice to meet you, Ella." Knuckles greeted back.

Ella turned to the man.

"Uh... have we met before?"

"No, Madam, but I'm delighted to make your aquaintance now."

"Dr. Cadberry!"

Knuckles and Dr. Cadberry turn around to see Tanaka holding a rake.

"Tanaka! You were in my archaeology class years ago!"

"Your perfect memory has not failed you! That class changed my entire life, Doctor!"

Tanaka covers his face to hide his tears of joy.

"You mean that's what inspired you to become a butler?" Dr. Cadberry asked.

"Yes. You taught that household servants played a vital role throughout history."

Tanaka swings his rake around a little bit.

"You always were unique."

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Chuck, Tanaka, Chris, Sonic, Y/N, Knuckles, and Dr. Cadberry are now sitting in the lab. Chuck is typing on a computer.

"I was at the palace doing some research when those two thugs attacked me and ran away with the map." Dr. Cadberry explained.

"It's not a total loss, though. At least we have a digital copy." Knuckles added.

Chuck pulls up an image of the map.

"Interesting. Why were you studying it?"

"Are you familiar with the legen of Murasia?"

"Is it a place?" Sonic asked.

Dr. Cadberry nods.

"Murasia is a continent that sank into the sea. It was the home of a spectacular civilization that flourished and died long ago. According to the legend, the Murasians possessed a highly-advanced culture that accomplished spectacular feats of engineering. However, in spite of all its amazing achievements, the magnificent Murasian civilization was wiped out in an instant."

"If the legends are even partly true, then the ruins of that civilizations could hold priceless secrets." Knuckles said.

"First the Seahawk is lost, and then this map is stolen. I have a feeling there's some kind of connection, but I'm not sure what it could be." Chuck said.

"The Seahawk was searching for Murasia. It was using this map as a guide. You see, the map reveals the continents of our world as they were in the distant past. Here, I'll show you. Now, when we adjust the data..."

Dr. Cadberry types on the computer, and the singular continent appears. Its land masses move until they align with the present-day continents.

"...it reveals how our world appeared prior to the volcanic eruption that destroyed Murasia."

A tiny land mass begins flashing.

"You see there? One piece is missing, just like in a jigsaw puzzle. It's the final clue we need to find the lost continent."

"I see it now. That is where Murasia was located." Tanaka confirmed.

"Exactly."

The location of Murasia moves to near the center of the map.

"Further analysis reveals that a piece of the continent survived the disaster, a tiny island that exists to this day. And that's exactly where the Seahawk disappeared."

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

A ship prepares to leave the dock. The X-Tornado is loaded on the ship. A marching band plays. Cream, Cheese, and Vanilla stand on the dock, holding one end of a group of streamers with the leaving party is holding the other end of.

"Bye-bye now!" Cream said.

"Chao-chaaao!" Cheese said.

"Have a safe voyage!" Vanilla said.

 Chuck, Sonic, Y/N, Dr. Cadberry, Tanaka, Tails, Chris, Knuckles, Amy, and Ella are prepared to set sail.

"Later!" Tails waved.

"Bye, guys!" Chris said.

"We'll take a lot of pictures for ya!" Amy promised, waving.

"Bye, sweetie!" Ella said.

"Take care!" Y/N said.

"Bye, and be careful!" Cream said.

The ship sails for days. One sunset, Chuck points to a spot on the map which the others (except Tails and Amy) are gathered around.

"Getting there won't be easy."

"That island is really just the top of a huge volcano. There's a whole chain of volcanoes underwater here, making this one of the most unstable regions in the whole world." Dr. Cadberry explained.

"This whole story seems wacky to me." Sonic commented.

"Sonic!" Y/N whacked him in the head.

"Ow!"

"The doctor knows what he's talkin' about." Knuckles said and started teasing. "You're just getting nervous because you're surrounded by H2O."

"Water doesn't scare me anymore!... I just don't like gettin' wet."

"Then you won't mind if I take you to the deck where you can see how beautiful the water is." Y/N said with a smirk.

"N-No thanks. I'm good."

Knuckles and Y/N snickered, knowing Sonic is still afraid of water. The next day, the ship nears an island with a volcano. Chris is standing at the bow of the ship with the Mobians.

"Well, there it is, guys." Amy said.

"Let's go ashore now so we can get off this tub." Sonic suggested anxiously.

"You're not in charge here, Sonic." Knuckles glared.

Inside, an object appears on the radar. The others join Chris and his friends at the bow of the ship.

"Look there!"

The water in front of them bubbles. The group looks on in amazement and horror as the water explodes into the air, soaking everyone. The impact is enough to rock the boat in such a way that the X-Tornado, in its X-Cyclone form, to topple over.

"Ah! The X-Tornado!" Tails exclaimed.

A giant craft begins rising from the water. It dwarfs the boat as it finishes rising out of the water. The unmistakable Eggman logo is at the bow of the ship.

"That ship belongs to Eggman!" Amy exclaimed.

Bokkun flies down with his TV to the bow of Dr. Cadberry's ship.

"Captain Eggman has an important maritime message for ya!"

The TV activates to show a close-up of Eggman. Steam flares from his nostrils.

"Surrender to me now. My new Egg Battleship has enough firepower to take on the Navy, the Air Force, and Sonic and Y/N too!"

"You stole that map from Dr. Cadberry!" Sonic said.

Eggman leans in toward the screen.

"You think so? Now why would I do a thing like that?"

"Just because you're so despicable." Amy retorted.

"That map led me here to the world's hot spot." Eggman pointed out.

"I don't follow you." Chuck said in confusion.

"I do. A hot spot is supposedly the weakest part of a planet's crust. If a volcano inside the hot spot erupts, all the other volcanoes in the world erupt too, but no respectable geologist believe such a bizarre theory." Dr. Cadberry said.

"Well, excuse me, Mr. I-Know-Everything. But whether you realize it or not, you're floating above a hot spot right now!"

"Now I see what you're getting at. The legends are vague, but it's possible that the Murasians somehow caused the deadly volcanic eruptions."

"Didn't any Murasians survive?" Chuck asked.

"It's likely the Murasians were all wiped out. There's no trace of them in the archaeological record after the volcano erupted."

"I don't have time to listen to you academic airheads discuss a bunch of scholarly mumbo-jumbo, thank you! The Murasians cracked open that hotspot once and sank a continent! Now I'm going to blast it open and cause a worldwide catastrophe! And on the ruins that remain, I'll build the Eggman Empire!"

The TV turns off.

"Oh yeah?"

Sonic leaps toward the Egg Battleship before executing a homing attack toward it. However, Eggman activates a deflective sail. Sonic bounces off of it and lands in the ocean.

"Sonic!" Chris shouted.

He runs to the edge of the ship and prepares to jump in when Y/N already beat him to it and leaps into the water to save Sonic. She dives down and soon reaches him and pulled him up to the surface.

"Y/N!!" Tails and Knuckles shouted.

Tanaka throws a life preserver to Y/N; she soon caught it and placed it around Sonic.

"Thanks, Tanaka!" she said.

Missiles begin to rain down around them. The explosions and gushing water rock the boat and cause the hedgehog siblings to hold onto the lifepreserver.

"It's going to be alright, bro! I've got you!"

But an explosion rocks them further from the boat. Meanwhile, Amy is kneeling on top of the X-Tornado as Tails and Chuck make repairs.

"They're in danger! Can't you fix this thing faster?" Amy shouted.

"I'm trying, Amy! We need a little more time!" Tails said.

Another explosion rocks the boat. Sonic clings onto Y/N for dear life.

"The wave is too strong!"

"I know! But we have to try!"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Inside the ship

"Sir, we've spotted something on the sonar." Navigator said over the radio.

"Can't this wait?! I'm a little busy right now!" Chuck shouted back at the radio.

"But sir, there's another ship coming this way! It's surfacing now!"

Ella, Tanaka, and Dr. Cadberry gather to see what the object could be.

"Who could that be?"

The dot on the radar moves closer and closer. Suddenly, a massive object rises out of the water. It resembles Eggman's old Egg Fort, but silver in color. Known as the GUN Fort V3, it launches a pair of missiles that damage the Egg Battleship. Tails and Chuck look on in awe.

"Alright!"

"It's a government ship!"

In the GUN Fort V3

"Surrender now, Eggman, or we'll destroy your ship! Prepare to fire on my order!" GUN Pilot said.

"Aye-aye!"

"I want in on the action too." Rouge said who's one of the crew.

"You're only aboard this ship as an observer, Rouge. Lock on target!"

The GUN Fort V3's cannons lock on to the Egg Battleship.

"If you want to play chicken, I'll be happy to clip your wings!" Eggman growled.

The Egg Battleship's sails extend, and it takes off into the air. It turns to face the GUN Fort V3, and several oars extend from it. Amy, Tails, Chris, and Chuck watch in awe. Y/N, who is about to climb the ladder with Sonic, also stares. She soon climb back up and they are now safe aboard the boat.

"I'm so glad you guys are okay!" Chris smiled in joy.

"Don't worry too much, Chris." Y/N smiled.

They watch as GUN's resurrected Egg Fort whales on the Egg Battleship. The GUN Fort V3 buzzes the Egg Battleship, slicing the starboard oar cannons off of Eggman's ship. 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Tails and Chris are inside the newly-repaired X-Cyclone, ready to take off. Sonic, Y/N, and Knuckles stand on the nose of the craft, and Amy and Chuck are on the sidelines.

"Everything's set for takeoff!" Tails said.

The X-Cyclone lifts into the air.

"Transform, X-Tornado!"

The X-Cyclone quickly changes into the X-Tornado and flies toward the Egg Battleship. The Eggman emblem's eyes glow blue, and a live feed is projected. The image shows the captive crew of the Seahawk. Topaz and the GUN Commander exchange a few words.

"It's Topaz! She's still alive!" Rouge gasped.

Eggman laughs before speaking through a voice amplifier.

"Stay away! If you destroy my ship, your comrades will go down with me! Gahahah!"

"Eggman, let them go!" Knuckles shouted.

"Fat chance. I'm holding them hostage, just to make sure I get what I came for."

The Egg Battleship is struck from behind by a missile fired by the GUN Fort V3. Rouge is trying to wrest the controls away from the GUN Pilot.

"Wait!"

"Back away. Hostages are not my jobs to stop Eggman. If you try to stop us, we'll treat you like an enemy."

One of the GUN Gunners points his gun at Rouge, causing her to let go.

"Either way, we're doin' our job."

The GUN Fort V3 unloads its barrels of missile upon the Egg Battleship, further damaging it and snapping its oars. Y/N growled in anger, grasping the golden limiter on her wrist. She couldn't believe they don't care about the hostages and just shoot the ship anyway.

"This is why I hate GUN...!"

"Those hostages need our help." Chris said in worry.

"No sweat, Chris!" Tails assured him. "Ready for action, Sonic and Y/N?"

"Watch me!" Sonic winked, giving him thumbs up.

"Let's go!" Y/N nodded in determination.

The X-Tornado speeds toward the GUN Fort V3, guns ablazing.

"Hey, whose side are they on?" GUN Pilot asked.

With the distraction, Rouge kicks the GUN Gunner aside, catches his gun, and snaps it in half.

"All I need is ten minutes tops." she said.

"Okay. But when your time runs out, I start shooting."

Rouge hurries away.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

As the Egg Battleship turns toward the island, Rouge flies out of the GUN Fort V3 toward Eggman's ship. Sonic, Y/N, and Knuckles see this.

"Not her again!" Knuckes growled.

"Rouge!" Y/N exclaimed.

"She's headin' for Eggman's ship. We have to distract him somehow!" Sonic said.

"Go for it, Tails!" Knuckles said.

The X-Tornado bombards the Egg Battleship with a pair of missiles to distract him while Rouge flies in through one of the Eggman emblem's eyes. The X-Tornado riddles the Egg Battleship with lasers. In Egg Battleship, Eggman's console begins sparking as a result of the damage it took. He tries to repair it.

"Why didn't I just become a dentist?!"

The X-Tornado blasts the Egg Battleship again. Suddenly, a large cannon extends out of the top of the Egg Battleship. It twinkles in the sunlight before it begins to charge with energy.

"What's that?" Sonic asked.

"I don't know." Y/N said.

Everyone is bathed in a red glow by the cannon as it begins crackling with energy. Sonic, Y/N, and Knuckles leap into the air toward the crackling energy. However, they are electrocuted by the energy, and fall toward the GUN Fort V3. The energy ball grows brighter.

"Surrender now, or we will fire the energy ray in ten seconds!" Decoe said.

Sonic, Y/N, and Knuckles are still falling.

"We don't have any time!" Knuckles said.

"We can't give up! Maybe if we attack it together!" Sonic said.

"Let's give it our best shot!" Y/N said.

The three heroes land on the GUN Fort V3, then immediately leap into the air. They hold hands before spinning rapidly together. They form a deadly ball that hurtles toward the charging and growing energy ball. They collide with the cannon, destroying it completely. Eggman screams as his console shorts out. Knuckles and Y/N glides to safety, and Sonic lands on his back. The X-Tornado picks them up. They fist-bump, wink, and give thumbs-ups to celebrate.

"Alright!!!"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The heavily-damaged Egg Battleship lands on the water. Fortunately, Eggman and his hench-bots have escaped in the Eggmobile as Eggman flies toward the island.

"Stop pushing! Back off! I can't steer!"

Back to the ship

"Maybe this trip was a big mistake. Maybe we never should've come." Dr. Cadberry said.

Ella, Tanaka, and Amy leave the deck, leaving just Chuck and Dr. Cadberry.

"If Eggman finds the ruins of Murasia, it could be dangerous."

"Yes... I'm beginning to think that Dr. Eggman was right, and that this place really is a hot spot."

Sonic, Y/N, and Knuckles say nothing as the X-Tornado flies toward the island.

https://youtu.be/LB_OZgUUDDY