De-Commissioned G.U.N. Headquarters

Sonic the Hedgehog of Mobius Prime stood next to his world's Shadow the Hedgehog, surveying the carnage and destruction taking place on this Mobius. Any other day, Sonic would crack a joke right now, but the situation was worse than he could imagine. Apparently, he was on a parallel world where he lost Sally Acorn and became a mad tyrant. This couldn't stand and Sonic was the only one who could stop his evil duplicate.

Of course, Sonic isn't the only one transported to this alternate Mobius. At the Freedom Fighters' insistence, Mobius Prime's versions of Sally Acorn, Miles "Tails" Prower, and Antoine D'Coolette joined the battle. If what the Insurgency said was true that Regime Sonic will be after their world next, the Freedom Fighters couldn't sit there and do nothing while this crisis is still going on. One short and sweet explanation from Insurgency Shadow, Snively, and Hope is all they needed.

Alongside Sally and Tails, Sonic and Shadow observed the chaos happening in Station Square and New Mobotropolis through multiple lab monitors.

"Whoa. I should've seen this coming," Sonic examined. "It's like a reprisal of the Great War with Doc Robotnik."

Sally nodded, "It only makes sense: this One-Planet Regime will raise New Mobotropolis and Station Square to the ground. Once they're finished, they'll attack our world next. We need all the help we can get right here."

"So when do we get started, guys?" Sonic asked his friends. "Those people are fish in a barrel down there."

Tails agreed, "Yeah. We've got to do something, and fast."

"First, we'll have to take care of the ground military forces attacking the cities," Shadow suggested.

Sonic smirked, clasping his left hand with a fist, "Sweet! That way, I'll focus on evil me when the coast is clear."

"Let's not be too hasty, Sonic," Sally eased. "Out-waiting the enemy would be risky for our teammates to handle alone. We'll do it together instead. It'll prevent more casualties that way. Then, you can focus on their Sonic." She rubbed her chin in deep thought, "Perfect Chaos is going to be the trickiest one, though."

"Collateral damage," Shadow noted. "But we can always bring in the big guns."

Sonic smiled again, "I get what you mean, Shadow. I've just have to take my dance with the big puddle of drop elsewhere before I use the big guns." He turned to Tails, "Yo, Tails! We'd better get to Station Square and smack some of Not-So-Much Scourge's flunkeys."

Tails cheerfully flew up with his two tails and raised his thumb up, "On it!"

Sonic's excitement wore down as he turned to face this world's Shadow. All the while, he had been pacing back and forth in deep thought.

"So, got anything else besides telling us the situation, Not-Our-Shadow?" Sonic asked.

Insurgency Shadow stopped his thoughts. He just looked at him before walking up to Sonic.

"I know this isn't entirely accurate…" Insurgency Shadow said. "But it's good to have you back, Sonic."

Sonic nodded at Insurgency Shadow, whose lips formed a smile for the first time in what seemed like forever.

"C'mon, Tails!" Sonic turned to his two-tailed sidekick. "We need to get to Station Square and help those Insurgents and our Freedom Fighter friends…"

"…before anything worse happens!" Tails added.

"Be careful, guys!" Sally instructed. "And good luck!"

Sonic and Tails gave a salute to the Freedom Fighter leader before zooming off, leaving Sally and Shadow to themselves.

"Shadow?" Sally asked.

"Yes, Sally?" Shadow asked.

Sally chuckled sheepishly before she continued, "Um, uh… Between the two of us… Are you sure in this world, we're married? And we have kids?" Her cheeks blushed red as she rubbed her head in the back. It reminded her of the time when Sonic and Sally were once a couple and broke up following Sonic's homecoming celebration, but a lot can change over time as their old romance was rekindling anew.

But a date would have to wait. Right now, there is a lot of work to be done.

Station Square
Speed Highway Streets

The people of Station Square screamed as the form of Drago Wolf ran across the street, slashing everything in sight with his nearly indestructible claws.

"Hey, Wolf-man!" A familiar voice echoed, slamming a Homing Attack into Drago's chest. "Your claws seriously need a manicure! Yeah, I said it before in our world, but I bet in this world, you haven't heard than one-liner before!"

"Sonic!" Drago growled, seeing what had to be the duplicates' version of Sonic. "I see in your world, you're still the same hog with a poor taste of humor."

"What's wrong with my humor?" Sonic asked. "All the kids seem to love it. And the ones who don't are probably stray cats who have less than nine lives than you do!"

"Shut up!" Drago yelled, slashing with his claws multiple times, but Sonic dodged every attack with his speed and sliced Drago's claws into pieces with his Spin Attack.

"Yo, Drago!" Sonic joked. "Guess what you're in? It's S.S.S.S.S.S.S., Sonic's Spinning Slashy Salon in Station Square for Suckers like you!"

"I'LL KILL YOU, SONIC!" Drago roared in frustration.

"Seesh!" Sonic shrugged. "If you don't want to cut your nails, I'll just give you a fine treatment of Spin Dash Sunday Supreme!"

On cue, Sonic landed a powerful Spin Dash that incapacitated Drago and left him unconscious. The Insurgents would later arrive and find a note attached to a tied-up Drago that read, "I hope giving his nails a manicure doesn't make him too limiting. Courtesy of Sonic, Sonic the Hedgehog."

Twinkle Park

The Sand Blasters were tearing up the amusement park of Twinkle Park and loving every second of it. The team leader, Jack Rabbit, noticed a mother holding tightly her 7-year old boy, trying to protect him from the chaos. Grinning, Jack prepared to roast them with a laser blaster…

…and then a Homing Attack split the weapon in two.

"What the heck?!" Jack exclaimed.

"What's up, Jack!" Sonic quipped, landing his feet on the ground. "How's life in Sand Blast City?"

"It's that down-and-dirty traitor, Sonic!" Avery the Bear shouted, throwing a crate towards Sonic who dodged it. "Get him!"

Shift E. Wolf threw a chain on him, but Sonic hopped over it. Jolt the Roadrunner and Tex the Lizard fired their laser blasters, only for Tails to deflect them all with his mini-shield.

"Get your kid outta here, ma'am!" Tails told the woman. She didn't need to be told twice and left instantly.

Shift tried to attack Sonic with his chain, but Sonic destroyed it with a Spin Attack, and he performed a Homing Attack, hitting Shift in the chest and knocking him out. Jack, Jolt, Tex, and Avery glared at the blue hedgehog.

"You are so freaking dead, road-hog," Jack growled.

"Wow, bunny rabbit," Sonic noted. "With you and your boys' labored breaths, you could be a stand in for Cactus Jack. Still, you don't have any spines so we'd either have to stick your body with needles, or dress you up in cosplay…"

"SHUT UP!" Jack screamed, as he ordered the Sand Blasters to fire at Sonic. However, in lightning speed, Sonic dodged and took out all of the Sand Blasters at once with multiple Homing Attacks.

Tails flew to Sonic and cheerfully gave him a hi-five, "Aw, yeah! Nothing stops the good ol' Homing Attack!"

Sonic smiled back, "Guess we're done with the place with the 'Cute Couples Get in Free' rule. C'mon, little bro. We've got ourselves an ugly, hissing wizard that needs a trim with a beard."

Tails nodded, "Yeah!"

As soon as they left, Sonic left another note. This one read, "Here's power to the people and the reason why people in the desert can't have nice things, like the old Dingo Regime. Courtesy of Sonic, Sonic the Hedgehog."

Soon, at the streets by the Colin Cash Bar…

A few feet above the ground, the ex-Regime Tails was fighting Rouge in an aerial battle. Rouge punched the two-tailed fox and slammed him to the ground, where below, Fang, Bean, and Bark were dodging attacks from continuous blasts from Sergeant Simian's sonic boom cannon. Espio leaped onto a car and threw an exploding kunai, disorientating Sergeant Simian. Fiona readies her Chaos Whip, but Flying Frog took out a gun and shot her in the leg. Before Bunnie can provide assistance, she found her right arm frozen by Ixis Naugus's ice magic. While Khan joined in to fight Flying Frog, Naugus stepped forward and used telekinesis from his magical staff to lift six nearby cars. Khan was taken off-guard as the cars were about to hit, until a blue ball destroyed the cars all at once.

Everyone turned to see the non-Regime Sonic arriving, much to their complete joy.

"Yo!" Sonic greeted his friends with a salute.

"Sonic!" Mainstream Bunnie cried. "Took ya long enough to get ya to Oz, partner!"

Sonic shrugged jokingly, "And here, I have a feeling we're not in our own Mobius anymore…"

Espio smiled confidently, "It appears this world's Shadow finally agreed to bring Sonic to the fight."

Khan agreed, "With him on our side, it will even up the battle."

"So, the Sonic from their world's on our side, huh?" Fiona asked with a smirk. "This'll be interesting."

Sonic smirked at Fiona, "Just like old times, huh?"

Fiona rolled her eyes with a grin, "In your dreams."

Meanwhile, Regime Tails shed tears upon staring at Mainstream Sonic's face. He thought to himself, "That's the Sonic I used to know. My best friend. My big brother. I wanted him in our world to be the same big brother I love… It's good to have him back." Regime Tails only smiled and bid Mainstream Sonic hello in silence.

"Alright!" Sonic cheered. "It's Freedom Fighters and Insurgency for one. You go ahead and deal with the others. I've got Naugus. C'mon, F.F.'s and I.G.'s… We can take 'em!"

"YEAH!" Everyone shouted with approval as they charge at the enemy forces, leaving Sonic to deal with Naugus alone.

"Sonic the Hedgehog!" Naugus declared. "In your world, you are still the stubborn, foolish hypocrite hero I know, before he won my admiration."

Sonic asked, "Working with Sonic makes you feel better? You sure are fighting awfully for him."

Naugus elaborated, "He admires my dedication to my ideals— the creation of a mass democracy and the spread of order and justice to the world. Our ideals are equal. The High Councilor offered to create for me a utopia where I will gloriously rule, where I will take my rightful place as king of the Republic of Acorn!"

"You still think you're the king of everything, Naugus?" Sonic scoffed. "If the Zone of Silence exists here, I suggest you pack your things, get out, and go home!"

"You are the one that should be going home, speedster!" Naugus responded with a powerful magic blast that Sonic dodged. The hedgehog retaliated with a Spin Dash that knocked him back towards the other end of an alleyway.

Naugus's magical staff glowed and he summoned multiple crystal pillars at Sonic. However, Sonic managed to destroy every single one of them with his Spin Attacks, Spin Dash, and Homing Attacks. He occasionally landed a Homing Attack at Naugus's chest, damaging him whenever there was an opportunity.

"You are weak, speedster!" Naugus declared. "Your world suffers for it."

Naugus resort to casting different elemental spells, but Sonic evaded them all to make way for another Homing Attack to the chest.

"There is no place for you here!" Naugus retorted.

Soon after a lot of attempts, Naugus decided to speed in to hit Sonic. However, Sonic blocked the attack using his elbow and delivered a strong right hook to Naugus's face, sending him to the ground. The Ixis Wizard got back up, looking at the blue speedster fiercely.

"High Councilor Sonic modeled his government after mine as it was in the Golden Age of the Republic of Acorn," Naugus pointed out. "We allow no insurrection!"

STAGE 1: SONIC THE HEDGEHOG VS. IXIS NAUGUS (REGIME)

Sonic struck first with three Homing Attacks to Naugus's face. The Ixis Wizard vanished in a fog of mist and appeared behind him, attempting to strike, but Sonic's speed helped him counter and give a hard Spin Dash to the chest. Naugus attempted to throw multiple elemental spells at Sonic, but his speed trumped all of them, and he landed another Spin Dash that stuck to Naugus's chest. Sonic pulled himself quickly and struck Naugus with both his feet.

Sonic rushed in and Spin Dashed Naugus upwards, and before he hits the ground, Sonic gave a hard Sonic Boost to Naugus's back, causing him to crash into a wall. Sonic gave him a downwards Homing Attack, sending Naugus to the ground.

Naugus responded by summoning two floating giants crystal hands, giving an unsuspecting Sonic double-fists to his elbows, sending him crashing to the ground. Normally, this would've hurt Sonic, but thankfully, he had taken a pill his evil duplicate created, which enhanced his strength, speed, and agility more than it had ever been. It hurts still, but Sonic wasn't going to let that stop him.

Naugus magic blasted him in the chest, and Sonic responded with another Spin Dash to the chest. Naugus magic blasted again, but Sonic countered with a Homing Attack in his sternum. Sonic then unleashed a series of punches and kicks faster than Naugus had ever seen. For the final blow, Sonic drops down and adopts a runner's stance, his body vibrating and charging with wind. With power up to 100%, he punched Naugus as if time stopped, runs around the city really fast, punched Naugus in the air, jumped up, and ended with one final punch to the face, sending Naugus back down.

Sonic looked over the Ixis Wizard who was trying to push himself up. He said with a smile, "This is the way evil ends, lizard-head. Not with a whimper, but with a bang."

Naugus attempted to punch him, but Sonic dodged and curled into a ball towards Naugus's magical staff, breaking it in half, much to his complete horror.

Sonic smirked, "How's that for being wizard?"

Naugus gasped, "You fool! What have you done?!"

"What do you think I've done?" Sonic shrugged. "I just did you a favor and gave you a 'listen to force' notice to get on outta here!"

"You don't understand!" Naugus shrieked frantically, as he found his body beginning to wither. "My magical staff is the source of my powers! It is the only think that keeps me alive! Sonic planted a bomb infused with negative Chaos Energy when he threatened to destroy me. If I had refused to cooperate and follow him, my body would rot…! Disappear! Be dismantled!" His voice grew weaker, "The Ixis magic… pulsing within… my staff… is the only… thing… keeping me alive… Without… it… I… would… Diiiieeee…! AAAGGGHHH!"

Those were Ixis Naugus's last words, whose body exploded into black electricity and dissolved into nothing. What remained of Naugus was his clothes scattered on the floor.

"So Naugus wants to be the king of everything, but he was sentenced to a life of serving the evil me to do it," Sonic pouted with a sigh. "Sucks for him."

Sonic was about to leave when he heard a thunderous battle cry. He turned around to see Regime Bunnie raising her fists in the air before she collided with him in one large tackle. The impact opened the ground beneath them, and both fell inside. At that moment, everyone who was fighting looked to see what happened. They looked at the massive hole in the ground as sounds of punches could be heard echoing from within. However, it was too dark to see what was happening.

Suddenly, Regime Bunnie went sailing out from one of the manholes, sending her into the far right wall as Sonic jumped out from the ground hole.

"Why do I have the feeling that what I smelled down there is an omen for what Hydrocity Zone is going to be like in this world?" Sonic asked.

Regime Bunnie snarled through her gritting teeth, "Ah'm gonna crush yer bones into dust."

"Sorry," Sonic shook his head. "Not gonna happen, Bad Bunnie."

STAGE 2: SONIC THE HEDGEHOG VS. BUNNIE RABBOT (REGIME)

Regime Bunnie zoomed in, but Sonic reacted quickly and punched her to the ground. Sonic gave another punch to the face, as she tried to punch back with her metal fists, but Sonic jumped over and hit her with two Homing Attacks. The blue hedgehog gave an Upper Spin Dash to the chin, followed by Homing Attack that drove her body downward. Regime Bunnie gave Sonic an uppercut and punched him backwards to the far-side of the street. She went in to punch him again, but Sonic sped past her and Spin Dashed a large neo-lit arrow that fell and smashed into Regime Bunnie's head.

Sonic then shot a Spin Dash at Regime Bunnie's chest, and pulled himself in, striking her with both of his feet. The blue speedster Upper Spin Dashed her body into the air again, added with a Homing Attack that sent her back to the ground. Sonic proceeded to punch and kick her repeatedly so many times that Regime Bunnie lost count of how many times she was hit. Eventually, Regime Bunnie managed to block one of the punches and pushed Sonic back.

"So does Antoine and you have robot-Mobian hybrid babies in this world?" Sonic quipped, readying himself.

"Ah'm gonna make ya bleed yer own teeth," Regime Bunnie scowled.

The two charged at each other. Regime Bunnie tried to punch him, but Sonic was quicker and kicked her in the chest, sending her backwards. Sonic gave her an onslaught of Spin Dashes and Homing Attacks until Regime Bunnie finally collapsed, defeated.

"That'll hold you long enough," Sonic said.

Suddenly, he screamed in pain when an EMP device stuck him to the chest and electrocute him, courtesy of a delightfully laughing Regime Rouge. This caused everyone to stop fighting and look at Regime Bunnie, who raised her metal fists and hammered Sonic, smashing him to the ground repeatedly, laughing amusingly together with Regime Rouge. As soon as the pummeling and the cruel laughter ceased, Rouge and Bunnie looked at the nearly-beaten Sonic, who barely had time to stand.

Rouge smirked, "Not the fastest thing alive, was he?" She took out a knife from her pocket and placed it near Sonic's neck, "See you later, fool!"

Before Rouge would deal the fatal blow, however, she was unexpectedly shot in the back by a laser rifle shot, courtesy of Fang the Sniper, accompanied by Bean and Bark.

Fang stated, "If anyone's a friend of the Insurgents, they're friends of mine."

"Why… you…" Rouge groaned in pain due to the laser shot that scorched the back of her body. She fell into the ground, unconscious.

"ROUGE!" Regime Bunnie screamed upon seeing her fallen ally. She turned to Sonic and his friends, berserk with rage, "AH'LL KILL YOU!"

"That's enough!" a voice with a thick French accent called. A voice both Bunnies recognized.

"Antoine!" the two Bunnie exclaimed.

Indeed, the figure of Antoine D'Coolette, Bunnie's husband, appeared with sword in hand.

Bunnie smiled upon seeing her husband again, "Well, the more the merrier. Mah sweetheart has come."

Antoine smiled back, "A pleasure to be with you on the side of battle once again, my love." He kissed Bunnie on the hand, making her blush and giggle. "None could ever replace you, especially those who would pose as you." He directed his sword in front of Regime Bunnie, "The thought of seeing someone who looks but acts differently! It disgusts me!"

Sonic quipped, "It's like Moebius with same people and different attitude."

Regime Bunnie was almost breaking down when she tried to speak, "Antoine… Ah…"

"If you think you would bring me to this world to make me love you, you are sorely mistaken," Antoine noted. "My heart is already filled with love. And my love remains with the woman I love with all my life, in my OWN world. And her name is Bunnie Rabbot D'Coolette."

Bunnie smirked and tugged Antoine into her arms, "Pucker up, candy lips."

The two kissed each other on the lips as Sonic and his friends smiled. Regime Bunnie, on the other hand, was hurt emotionally. She knelt down on her knees, sobbing uncontrollably. She remembered when things had been different, before New Mobotropolis, before Antoine's death, before the One-Planet Regime. She remembered how Bunnie and Antoine started out as friends, then lovers, and eventually a wed couple before Knothole was set ablaze by the Egg Fleet. Their love was unbreakable, until Antoine's death did them part. Bunnie's sobbing was the only thing that shattered her nearly unbreakable cold exterior. Her emotions won her over.

Antoine was gone. Everything Bunnie had loved in this world was gone.

And now she was all alone.

Still sobbing, Regime Bunnie looked at her Mainstream counterpart after she stopped kissing Antoine.

"Here's yer chance to set things right, Bunnie," Mainstream Bunnie said. "If Ah were you, Ah would take it." Her friends and husband nodded in agreement.

Regime Bunnie already made her decision. There was no point in fighting back anymore. This was the point of no return.

She surrendered.

A few minutes later…

"All threats to Station Square have been neutralized," Espio reported.

Sonic added, "Now that leaves us with…"

"Sonic!" Mainstream Tails called via Sonic's earpiece. "You'd better get to New Mobotropolis right away! This world's Monkey Khan is leading a huge army of ninjas, and they're causing trouble down there!"

"On it!" Sonic complied.

"I'll take you there!" Mainstream Khan offered, summoning a nimbus cloud with the snap of his fingers.

"Wait! What about me?!" Rouge screamed, tied up to a nearby lamppost after the previous battle.

"Go help yourself out," Fiona sarcastically grinned. "Besides, don't try that whole 'jewels are the only thing for me' thing. There's more to life than just eyeing on jewels, you know?"

Rouge protested, "But I love jewels! Jewels are my life!"

Antoine pointed out, "Money is the root of all evil!"

Bean cracked, "Maybe a day or two in the funhouse ought to chill ya out."

Fang snickered, "Don't worry, sweetie. We're not gonna hurt ya. You're safe with us. Until then, you're not goin' anywhere."

This caused Rouge to gulp nervously.

Mainstream Bunnie turned to Sonic, "Sonic, you go ahead and kick Khan's evil butt. We'll stay here and clean up the city."

Sonic nodded, "Yep. He's gonna have a Spin Dash with his name on it." He jumped on top of the nimbus cloud, "Ready to roll?"

Khan grinned back, "You don't have to tell me twice, speedster." He summoned his own nimbus cloud and stood on top of it, "Let's go!"

Sonic and Khan sped upward with their nimbus clouds, leaving the others behind.

"Hey, batty-watty!" Bean quipped to Rouge, juggling his already lit bombs. "Wanna see me do a magic trick?"

"Noooooooo!" Rouge said horrified. "Somebody heeeeellllppp!"

New Mobotropolis
Downtown

A group of human Insurgents spirited away from a gigantic tidal wave almost as big as the buildings they were running past.

"Open Your Heart, Jun Senoue!" a soldier with glasses and short black hair shouted. "What in the name of Sonic Heroes could control the very forces of nature like that?"

"Have no idea, Johnny!" another soldier with long colored hair spoke in a Japanese accent. "All I know is that we'd better survive this because we're just two days from concert schedule!"

Behind the giant tidal wave, Regime Monkey Khan was leading a battalion of Yagyu, Raiju, Gossamer, and Shinobi as the Dragon Kingdom's magicians were using their powers over the elements to create the tidal wave as a defensive barrier. Just then, the wave froze solid, making the marching Four Clans stop in confusion.

They saw Miles "Tails" Power using a freeze-ray from his Buster Arm Cannon, turning the tidal wave into a huge block of ice. Sonic smashed through the ice with a Spin Dash, shattering it to millions of tiny pieces and allowing him to face Regime Khan and his forces head on.

"Are you ready, Sonic the Hedgehog?" Regime Khan asked, readying his thunder staff. "To take on the might of the Dragon Kingdom?!"

"Yes," Sonic smirked, looking at the sky above them. "WE are."

Regime Khan was confused at first, but when he turned his attention to the sky, he gasped. Hundreds of Rose Fleet airships popped out of the clouds, all turrets targeted towards the Dragon Kingdom armies.

At the main deck of the flagship, Amy Rose stood next to her new Egg Pawn friends and smiled. She took the microphone and declared with a loud and strong voice through the loudspeaker:

"FREEDOM FIGHTERS AND INSURGENCY FOREVER!"

The Egg Pawns raised their fists and shouted the same message.

"FREEDOM FIGHTERS AND INSURGENCY FOREVER!"

With that, the Rose Fleet airships fired all weapons. Regime Monkey Khan brought his staff down to the ground, taking all of the intense firepower's force with a field of electrical energy. But his Dragon Kingdom battalion wasn't so lucky. Thousands upon thousands throughout the city were blown to pieces, while a few remaining raised their shields to defend themselves.

"For the Echidnas! For the Brotherhood of Guardians!" another voice called.

Sonic smirked again to see his world's Knuckles leading an army of Echidnas with a noble battle cry. They engaged the remnants of the Dragon Kingdom's army in combat, while a few Egg Pawns came down from the Rose Fleet ships to assist them. That left Sonic to deal with this world's Monkey Khan.

Regime Khan tried to swing at him with his electric-induced thunder staff, but Sonic simply dodged at breakneck speed, and then Regime Khan kicked his exposed chest.

"You're not wanted here!" Regime Khan declared.

STAGE 3: SONIC THE HEDGEHOG VS. MONKEY KHAN (REGIME)

Khan tried to hit Sonic, but the blue hedgehog countered with a Homing Attack. He Spin Dashed Khan upwards and performed Homing Attack to the chest. Khan retaliates with a fully charged thunder strike to Sonic's chest, but Sonic's durability enhancement prevented the wound from being fatal. Sonic countered with five Homing Attacks, followed by a Spin Dash that sent him to a car which exploded. Sonic did a Bouncing Dash, sending Khan into the air once more before Homing Attacking him back down to the ground.

Sonic gave Khan two punches to the face, leaped up, and then a Homing Attack to the chest, followed by a pullback with both his feet. Sonic went in to take him down, but Khan simply smacked his head down. Khan was about to counter, but Sonic knocked him back with a Spin Dash to the chest, followed by two Homing Attacks and a Sonic Boost at fast speed. Khan slammed his thunder staff again, but Sonic kicked him back to the far other side of the street. Sonic gave two more Homing Attacks, and then another Spin Dash. Finally, Sonic unleashed a series of speedy combos before Khan hits the ground, defeated and unconscious.

"I may not be wanted," Sonic explained. "But I'm clearly needed." With that, he sped off.

Meanwhile, at Station Square…

While Mainstream Bunnie and her teammates were busy flushing out the remnants of the One-Planet Regime throughout Station Square, Regime Rouge frantically made a communications link in her earpiece, desperate to call for reinforcements.

"This is Rouge to all Regime forces!" Rouge shrieked. "We need reinforcements!"

"Commander Rouge!" a soldier reported. "All of our reinforcements… they're all wiped out!"

"WHAT?!" Rouge exclaimed at the top of her lungs. "HOW?!"

"The Rose Fleet has spread throughout Mobius and destroyed every military branch in the One-Earth Regime! Our airspace and marine forces have been breached! It's happening everywhere all over the planet! Downunda! Efrika! Eurish! The Northern and Southern Tundras! Soumerca! Yurashia! Northamer! They're rising everywhere! Even the citizens are fighting back! It's no good…! Break through eminent! Aaarrrgghh…!"

The communications link was replaced with a distorted crackle. Rouge's eyes widened with horror. She finally understood what that meant.

The One-Planet Regime is losing... and tearing itself apart.

Back at New Mobotropolis…

Sonic, Tails, and Knuckles watched the remaining Dragon Kingdom fighters forced to retreat with Mainstream Khan, the Echidnas, and the Egg Pawns giving chase.

"I guess ninja school's out forever," Sonic quipped.

Tails agreed, "Ninjas are super-quick and all, but they sure don't have a chance in heck of escaping from an airship's firepower."

Knuckles chuckled and placed a hand on Sonic's shoulder, "I should've saved some action for you, but you cool with fighting this world's Khan?"

Sonic assured, "No worries, Knux. Fighting Prince Free Hairball had to do."

"Great news, Sonic!" Sally said through Sonic's earpiece. "Amy's Rose Fleet broke their ranks and overthrew every military branch on Mobius. They're retreating."

"That means we're winning! Cool!" Sonic smiled. "Just one thing… Your best friend's other self almost turned me into hedge-paste. But she's taken care of with the rest."

"Good to hear," Sally's voice sighed. "We'll have Amy break off a legion so we can start with rescue and recovery."

"Thanks, Sal," Sonic nodded. "You always make it look easy."

"Let's get through this first, Sonic," Sally's voice chuckled. "Then you can tell me how easy it looked."

"Right. We're gonna—" Sonic began.

Before Sonic finished his sentence, he was hit by a large mass of water that sent him crashing through the windows of a building, much to Tails and Knuckles' surprise.

"SONIC!" Tails cried.

"Tails!" Knuckles assured with a hand on Tails' shoulder. "Don't worry! He'll be fine. Shadow gave Sonic the big guns, remember?"

Tails rubbed his head and chuckled nervously, "Oh, right. I forgot." He felt reassured that Sonic will be alright.

Meanwhile…

New Mobotropolis was literally flooded by a rain of chaos. The sewers erupted through the city's manholes, the road cracked open from water pressure, and the streets were submerged into waves under 1,000 feet. Rising out of the endless water was a lizard's head attached to a body created from a large section of water, and two tentacles on the left and right.

Perfect Chaos, the true and absolute final form with all seven Chaos Emeralds fed, roared ferociously amidst the nearly flooded city, and opened its serpentine eyes towards Sonic, who stood on a road miraculously standing above Chaos's deadly waves. Perfect Chaos's orders were clear: Destroy everything, including Sonic the Hedgehog, and be done with it.

"This is it," Sonic thought to himself. "Time to bring out the big guns. It's all or nothing!"

Centering his energy, Sonic summoned seven colored bright lights circling around him. As the spinning lights reached their optimum speeds, Sonic lets out a skyward scream. The bright light poured into his body, a bright light expanding outwards and rocketing to the sky. Standing at its source, the energy swirling and crackling around him, Sonic stood with his blue fur replaced with a shining yellow. His eyes opened, emerald green turned into shades of rubies. Sonic was now transformed into Super Sonic!

"Time to scramble some Perfect Chaos one more time, SUPER SONIC STYLE!" Sonic's super form shouted with determination.

With that, in a flash of radiant light, Super Sonic dashed into the head of Perfect Chaos, their collision creating an immense shockwave that spread throughout the city…

At Insurgency HQ…

"So how did you get all seven Chaos Emeralds?" Sally asked Insurgency Shadow.

Insurgency Shadow explained, "Dr. Finitevus stole the Chaos Emeralds from the secret vault at the Hall of Justice. But the problem is, all of their energy was absorbed to feed Perfect Chaos. Fortunately for us, Dr. Finitevus channeled the Master Emerald's energy to restore the Emeralds to full power. I wasn't aware of this until Hope and Colin told me. Finitevus entrusted the Chaos Emeralds to them before he died."

"Why would Finitevus restore the Emeralds?" Sally asked again.

"I don't know," Insurgency Shadow shrugged. "Perhaps he wanted to make one final trump card to turn the tide of war in our favor. And I never had to guess."

Sally smiled confidently, "I wouldn't have to, either." It was assuring to know that the Chaos Emeralds would turn the tide— and fulfill Fintevus's dying wish.

As soon as the surge of light throughout the city dissipated, the waters below receded and dissolved into small puddles. Super Sonic dragged Chaos— now reverted to his Chaos Zero form— above New Mobotropolis whilst the liquefied monster tried to beat him up with his watery fists. Super Sonic's a wonder; he's more than enough to neutralize all of Perfect Chaos's powers and change him back to his original form.

Chaos Zero screeched as he collapsed into the ground of a huge crater nearby, made as a result of a city district destroyed by High Councilor Sonic. Super Sonic transformed back to his normal form and landed safely on the ground. The blue speedster confronted Chaos Zero, who weakly stood up and stared at Sonic with cold eyes.

Chaos Zero screeched in a distorted, watery tone, "I live to kill you."

Sonic shot back, "Then you'll live disappointed."

STAGE 4: SONIC THE HEDGEHOG VS. CHAOS ZERO (REGIME)

Sonic performed three Homing Attacks on Chaos Zero, damaging his watery body, whilst dodging a few watery fists many times. Chaos Zero morphed into puddle form, reappeared, and attempted to trample over Sonic, but the blue speedster leaped up and Spin Attacked his back. The Spin Attack was strong enough to split Chaos Zero's body in half, but he quickly regenerated, considering his body was made of water. Chaos Zero attempted another flurry of watery fists, but Sonic dodged them all and continued his onslaught of Homing Attacks. The liquefied monster tried to get back, but with all the exhaustion from his scuffle with Super Sonic and all of his energy drained, Chaos Zero collapsed into the ground. Sonic stood over the liquefied creature with an idea of what he could do to take care of him.

"I think we've had enough Chaos for one day," Sonic said. Summoning the Chaos Emeralds, he channeled their power to transform into Super Sonic again. He grabbed Chaos Zero's body, flew him towards Angel Island in a mere five seconds, and tossed him into the Master Emerald, where his liquefied body was absorbed into the large green gemstone, sealing him away from the world once more.

In another mere five seconds, Super Sonic returned to the crater in New Mobotropolis and turned back to normal. The blue hedgehog wiped his head of sweat, relived that the chaos had been averted.

He couldn't help but feel something was still off. A small meteor of yellow light appeared from the sky, and Sonic dodged it before it made impact. When the meteor crashed into the ground, out of the smoke appeared a physical figure. Something Sonic knows very well.

It was the Regime version of Sonic the Hedgehog, glaring with murderous intent.