Sonic - lying face down on the ground - with smoke covering the background. The smoke clears as voices echo and allies run in the background.

"Hold your positions." Squad commander Red ordered.

"What is happening?" Knucks asked.

"Reinforcements are coming."

"I'm getting destroyed out here." Dr. Deep said.

"Get up, Sonic. Get up!" Gwen called out.

Sonic opens his eyes and gets up, gasping and panting as he looks at the size of Grim Big.

"Oh, no. No, no, no."

Grim Big's head opens, deploying a flurry of small Froggy-style bombs, approaching Sonic - Gwen flails her arms in panic.

"Scatter!" Gwen warned everyone.

The bombs explode on the ground in puffs of smoke.

"Coming in hot. Take cover!" Squad commander Red warned.

As Jack yells, Sonic looks up at the giant robot. It deploys more Froggy bombs. One of them hits an Eggforcer and Denizen 1998, sending the cat flying and falling flat on his face. Froggy croaks. Sonic intercepts another bomb with his feet. He peels out, pushing Denizen 1998 away from Grim Big's incoming tail attack. Knucks and more of Sonic's allies head towards Grim Big. The giant robot locks onto the Mothership, and deploys more Froggy Bombs. They home in on the Mothership. Mr. Dr. Eggman screams inside the cockpit as the bombs explode all around it.

"Nooo!" Mr. Dr. Eggman yelled.

The Mothership cannons break down, the ship itself engulfs into flames. Mr. Dr. Eggman looks at the monitor.

"The Mothership cannons are down. I need some assistance."

A group of Grim Birdies head toward the Mothership.

"One bucket of fried robo-chicken coming up!" Dr. Done-It said.

The Yolkomotive fires bullets and takes down some Grim Birdies. Nine watches on, growling in anger. The Kraken - with Black Rose and Rusty Rose on the bridge - flies alongside the Yolkomotive.

"We too are on our way." Rusty Rose said.

"Stop the ships!"

Nine deploys another horde of Grim Birdies and Grim Rouges to try to intercept the three aircraft.

They fly toward the Kraken. Rusty jumps off the bridge and start shooting from the turret. Meanwhile, A Grim Birdie squawks and flexes in-front of Dr. Done-It.

"Huh? Wah!"

Dr. Babble and Dr. Deep fly alongside each other, approaching Grim Big. Dr. Babble babbles and then makes the sound of a cat meowing, adjusting his mech's shoulders to look like a pair of cat ears from the viewer's point of view.

"Indeed. And like all kitty cats, it's evil to the core. Prepare to flank on my mark."

Grim Big's tail swipes and knocks them both out, causing them to scream.

"Flee! Flee for your lives!" Jack yelled.

Sonic and Gwen fights a group of Grim robots. Grim Big targets Sonic but tries not on Gwen.

"Ha, whoa!" they yelped in unison

Grim Big hovers forward, with Rebel watching on and Sonic and Gwen continuing to battle.

"It's focused on the hedgehogs." Rebel said.

"Which means it won't see me coming. Boss battle." Dr. Don't commanded a group of Eggforcers to go after Grim Big.

As they approach, the giant robot, the camera cuts to Dr. Don't, who is seen dodging raining Eggforcer parts.

"What, huh?"

Grim Big then locks its target on him.

"Can I get a restart? What the?"

Dr. Don't chucks away his controllers and makes a bee-line away from it while it deploys a mass number of Froggy bombs, which explode and send him flying while trying to hang on to his seat. Grim Big's tail slams on the ground. Batten, having witnessed the dust cloud, flies up to safety while the tail breaks Grim Amy. Sonic, Gwen and their allies retreat, fearing the worst, but Grim Big's tail slams the ground again, sending them flying a short distance.

"That's it, your nine evil robo-lives just ran out."

Sonic angrily makes a run for it.

"Sonic wait, hang back! Stick to the plan!" Gwen said, as she continued fighting the grim robots.

Nine watches on in disgust.

"Predictable."

Sonic weaves past incoming Grim robots, but screams as he is blown back again by Grim Big's swinging tail.

"After him!" Nine ordered.

He falls and skids on the ground, grunting and coughing. Nine clones another Grim Sonic. A group of four surround an exhausted Sonic.

"Right, stick to the plan." Sonic growled as he is being surrounded by his Grim counterparts.

In slow motion, they pounce towards him simultaneously. He jumps. One of the Grim Sonics grabs him and throws him into another one, which punches him. He flies over the third, handstands on the ground and kips up, dodging a tackle attack. Another one tries to tackle him but he flips over it, however another one grabs him and sets him up to be kicked by another, but manages to get back on his feet.

"Nine!" Sonic growled.

A silent Nine looks down at Sonic.

"You want me?"

Sonic intercepts more attacks from Grim Sonics.

"Come catch me."

Sonic runs, with the robots chasing him.

Meanwhile, at the Citadel, Gnarly, Hangry, T'Challa and Prim climb up the ledge and watch the action from the structure.

"He's buying us time. Let's use it. Keep moving." Prime said as they creep along the structure.

Nine watches Sonic being chased by his Grim counterparts.

"Where are you going?"

Nine opens out his tails and extracts Paradox beam energy. The dome fluctuates repeatedly. Down on the ground, Grim Big turns slowly and powers down.

"Its power is draining." Rebel said.

Knucks, along with two other rebels, arrive onto Grim Big's base.

"Now's our chance!"

Knucks runs across the base and punches the giant robot's stomach.

"Ha, that's more like it. Finally making a dent in this thing."

Nine stops extracting from the beam, points his tails forward and generates an orb, shooting green lasers on the ground where Sonic is still running, blowing up fissures. Sonic brakes to a halt and wobbles at the edge of the large crack.

"Whoa, whoa, whoa, whoa, whoa. Whoa." Sonic said, relieved

"Sonic, are you okay?" Gwen asked, skating to her brother.

"Yeah, I'm...."

Sonic is grabbed from behind by a Grim Sonic, sending him falling.

"Sonic!" Gwen screamed.

The Grim Sonic triangle jumps and tackles Sonic repeatedly while he falls, before delivering a blow, sending Sonic crashing to the ground at the bottom. The Grim Sonic tosses Sonic into a pile of robot parts. Gwen growls as she looks her body as her arms and legs are already covered in shards, so she'll keep fighting for her brother, friends and her home as she fights the grims robots mostly grim sonics.

Meanwhile, Nine raises his arms, and Grim Big rejuvenates power. Knucks tries to hang on to Grim Big's tail as it swings around. The tail swings into and hits Dr. Babble, causing Renegade Knucks to lose grip and fly off, but Thorn rescues him. Grim Big deploys more Froggy bombs towards the running group of allies.

"Run!" Jack screamed.

"Look out!" Rebel warned.

One missile explodes - just barely missing Jack, who Rebel just saved, and generates a crater.

"Ugh! Enough of this. I'm no one's sacrificial lamb. Mr. Doctor, we need the Mothership!" Dr. Deep said, while Grim Big's tail intercepts more Eggforcers.

While Eggforcers are seen trying to repair the Mothership, bullets hit them and take them out. Grim Birdies swoop around the Mothership. Mr. Dr. Eggman groans nervously inside the cockpit and puts his hands back on the controls. The Kraken and the Yolkomotive approach the Mothership. Rusty fires from the turret. Meanwhile, on the Mothership's deck, a group of Grim Rouges and Grim Birdies take off and start attacking. Rusty takes one of them out, while the others make it and swoop around the Kraken, while some Grim bullets hit the bridge. A Grim Rouge lands on it and goes to tackle Black, but she blocks it with the sword.

On the Yolkomotive...

"One order of extra crispy wings coming up."

Dr. Done-It shoots from the turret, breaking another group of Grim Birdies who peck on its windshield.

On the Mothership, more Eggforcers try to make their way to the cannons, but more Grim Rouges stop them. Meanwhile, Sonic is being punched repeatedly by a Grim Sonic. As the Grim Sonic prepares to deliver the final blow, a grunting is heard in the background. Shadow hits the Grim Robot and stands in front of Sonic. Sonic becomes relieved after seeing Shadow for the first time in a while.

"Shadow, you're alive! Help a brother up?" Sonic said happily, offering a hand.

"We are not related." Shadow pointed out.

"Never mind. You okay?" Sonic sighed.

"I survived. Is Gwen okay?" Shadow said worried about Gwen.

"Gwen is fine, except she's slowly becoming more prism until she's completely gone."

Shadow is shocked about the grave news with sadness within, then he snapped out of it.

"Nine's Alphas deployed a massive army to keep me down here." he said.

"Alphas? You mean the ones that can duplicate themselves?" Sonic asked.

"If I still had that Chaos Emerald, I could have teleported out of here, but it's lost in the Void. And, smashing hordes of Sonics isn't the worst thing in the world."

Ground debris falls close to them. They both look upward and see two Grim Sonics looking down at them.

"Up for smashing a few more mes?"

They both run out up the wall and punch the Grim Sonics simultaneously. Meanwhile, Grim Birdie flies across one side of the citadel structure, which the scavengers notice. They hide behind a wall.

"We're gonna need to sneak past that thing if we wanna cut off Nine from the Prism, ideas?" Prim asked.

"I've got one, but I'll need four rocks, 80 feet of vine, and a time machine." Gnarly said.

Prim brows down, her ears droop and she walks away. Hangry follows Prim, showing an embarrassed look at Gnarly. Gnarly follows them too. All three of them climb further up the building.

Meanwhile, on the ground, Gwen takes out a Grim robot while Sonic engages in battle with another one, but is punched by the Grim Sonic's fist and is sent flying into a crystal wall, sliding down. Shadow spins and homing attacks two more Grim robots, slamming down a third one before jumping spinning himself away from the fourth. He dodges a leg and a grab attack from the robot. They both fly high and hit each other, both standing up as they land. Shadow grunts and hits the Grim Sonic again, dodging another attack. Shadow leaps and kicks the Grim Robot into the wall, which it lands on and leaps back to attack. Another Grim Sonic tries to tag Sonic but he leaps to dodge it. Gwen notices in the distance Shadow being chased by the other Grim Sonic as they leap over the crack. Shadow dodges Grim Sonic's punches. He crouches to avoid a swinging leg before leaping up. As the Grim Sonic does likewise, Shadow spins in mid-air and hits the robot, knocking it out through the fissure.

"Huh." Sonic said to Grim sonic, as the siblings nods.

Sonic and Gwen taunts at his Grim counterpart and runs. It chases him. He jumps over the crack. By the time the Grim Sonic jumps over the crack, Sonic and Gwen stops it in mid-air with a homing attack, causing it to fall through. On the other side, Shadow grabs another Grim robot and tosses it to Sonic and Gwen, who knocks it back with a spin attack. Shadow punches it towards the hole and Sonic smacks it down with another spin attack. Sonic and Gwen celebrates next to Shadow.

"Hellooo teamwork! Up top!" Sonic cheered, chuckling and raising his hands.

Gwen happily high fives him before facing Shadow.

"Shadow! Glad you're okay!"

Gwen hugs shadow and he smiles softly and hugs back as they're so glad to see each other again.

"I'm glad you're okay, well mostly.." Shadow said as he looked her body seeing her slowly turn into the prism and turned to Sonic. "These troopers are one thing, but the Alphas can generate an endless army. They are the real threat."

Sonic realizes while keeping his hand up to Shadow, pointing to the Alpha Grim Robots while facing Sonic. Sonic sighs and claps his own raised hand.

"Rebel's plan is working. The Scavengers are through to the Citadel. They're gonna cut Nine off from the Prism." Gwen said.

"Which is in Nine's lab, guarded by the Alphas. They'll never reach it." Shadow said.

"So how do we destroy them?" Gwen asked.

"We don't. We're going after Nine."

"No, we're not. You said it yourself. If we don't go after the Alphas, we're cooked. And the only way we win this thing is if we work together. We need the others." Sonic grabbed Shadow on the shoulder.

"It's the end of the universe, and you're still thinking about your friends." Shadow said, annoyed.

"Of course we are. They're all here, fighting, sacrificing themselves for us." Gwen said.

"All the more reason to go after Nine while he's distracted." Shadow said.

"And let my friends get pummeled when Nine only wants me? Nine only wants me. I have an idea." Sonic said.

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

Meanwhile, the mothership is being damaged and tries to repair in time.

"We're getting destroyed out here." Dr. Deep said.

"Keep your mustache on, Doctor. The cannons are almost repaired." Mr. Dr. Doctor said.

The mothership's cannon is fully repaired. It powers up and glows bright red.

"At last!"

Two of the mothership's cannons prepare a growing orb. Nine watches on, becoming worried. Grim Big focuses on the mothership. Meanwhile, Red finally pulls Jack out of the crystal.

"The Mothership! Take out the Mothership!" Nine ordered.

Mr. Dr. Eggman targets Grim Big.

"So long, you colossal waste."

A humongous laser is fired, and hits Grim Big with a powerful explosion that shakes the ground. Nine flinches and braces himself from the impact, along with Dread, Catfish and Rebel. Purple dust clears, revealing black smoke pluming out of its head. Grim Big's thrusters splutter and turns uncontrollably.

"No, no, no!" Nine yelled.

Grim Big falls over and crashes onto the ground, shaking it and blowing a wave of dust in the air. Sonic, Gwen and Shadow become astonished while they run and skate and look at each other. Sonic's allies cheer in celebration, along with the Chaos Council. Sonic, Gwen and Shadow come over to and greet the rebels.

"Hoo-hoo-hoo! You did it, you took out that behemoth!" Sonic cheered.

"Now that's teamwork!" Gwen added.

"Sonic, Gwen, you're both okay!" Rebel said in relief.

"Gang, this is Shadow. Shadow, meet, well, everyone, I guess." Sonic introduced, wrapping his arm around Shadow, who looks unhappy.

The group are unconvinced, but are immediately interrupted by a furious Nine. They see Nine powering up the energy beam with his mechanical tails, letting off frustrated growls.

"Well, that's terrifying." Gwen said, terrified.

The dome fluctuates again. Nine notices the purple rocks floating in the sky. He turns his tails forward and powers up a green laser beam towards the mothership. Mr. Dr. Eggman screams and makes a run for it. Everyone watches on as the mothership's deck is hit by the green laser beam. It crashes and burns.

"Oh, my egg!" Dr. Done-It gasped.

Mr. Dr. Eggman evacuates the mothership using his mech, but screams as he is blasted by an explosion. Nine watches the whole mothership explode in midair and flinches. Dr. Babble wails in fear.

"MY BUTTERSCOTCH CANDIES!!!"

"MY VIDEO GAMES!!!" Dr. Don't wailed.

"MY ESSENTIAL OILS!!!" Dr. Deep wailed.

Mr. Dr. Eggman crash lands on the ground. Sonic and Gwen's team gather around.

"Mr. Doctor, are you alive? Say something!"

Mr. Dr. Eggman pops his head out of the mech.

"Mark my words, we're going to melt that fox." he declared.

Nine groans and has his head in his hands. The Prism shield starts to decay, causing the dome to shrink; the crystals in the dome start disappearing.

"Every time he diverts power, the dome shrinks. He needs my energy to stabilize it." Sonic realized.

Nine pants in exhaustion, but sees something below.

"Huh?"

Nine watches the Scavengers make their way up to the top of the Citadel structure. He draws three mechanical tails. The Scavengers are forced up in the air by rising crystals.

"Prim!" Rebel screamed.

"T'Challa!" Gwen screamed.

Prim sees Hangry, T'Challa and Gnarly being flown up in the air and flies up, grabbing Gnarly while Hangry catches Gnarly's foot, rescuing each other. And T'Challa uses her claws to make a grab hold, slowing to the ground from being injured but looks tried and pants.

"The plan, it failed."'

Sonic, Gwen, Shadow, and their allies watch the paradox prism load up with power.

"We're running out of time. I need you, all of you, to listen to us." Gwen said.

"Why should anyone listen to you?" Dr. Deep asked.

"Because we know how we can win." Sonic answered.

An annoyed Nine stands, holding his shoulder. Sonic and Gwen gathers their allies together, while Nine growls in anger and fires up the Paradox energy beam once again. He facepalms while he struggles.

"No, the dome..." Nine stops firing.

"You'll never catch us, Nine. We're too fast. Hit us with everything you've got!" Sonic said angrily.

"No more waiting."

The Alpha Grim Bots take off.

"Rebel?" Gwen said, looking at Rebel and Shadow.

Sonic, Gwen, Rebel and Shadow nod. The Alpha Grim Bots land on the ground close to Sonic's team. Nine fires green lasers at them to clone them once again. Lines of Bots run forward.

"Here they come." the siblings said in unison.

Sonic combats his Alpha Grim counterpart. They punch him back. Gwen tackles it. They notices other Grims taking out some of his allies. Red is smacked by a Grim Amy's hammer.

"No!"

As Sonic and Gwen runs and skates away, the Alpha Grim Sonic rejuvenates. Shadow runs towards it and punches it high, causing it to crash into the ground. A split screen between it and Shadow appears.

"Finally. Prove your worth, machine."

They close in on each other showing their fists. Sonic and Gwen runs over to help their allies, but the Alpha Grim Birdie strikes them. Black tries to hit an Alpha Grim with her sword, but is punched in return. Batten and Dread are also punched in a triple screen.

"It's hopeless, run!"

Jack and Red ran but are encountered by the Alpha Grim Knuckles.

It punches and scoops them up in the air, causing them to scream. Sonic is dropped onto the ground with a thud, groaning and holding his head. While Gwen use her fire powers to blast the grim birdie, she hovers by using air power and go helps sonic.

"Back, back I say." Red warned, swishing her sword.

Red's sword is blocked by a Grim Knuckles, which punches her back and collides into a wall. Sonic and Gwen yelps as the Grim Birdies go after the Yolkomotive, which breaks down.

"Ah!" Dr. Done-It yelped.

One of the Yolkomotive's thrusters breaks off.

"I'm going down!"

The ship crashes on the ground through the Citadel's wall and stops by the base, powering down. Meanwhile, Dr. Babble takes on more Grim robots. As it smacks down one Grim Amy, another Grim Amy scoops him up with its hammer. He falls onto Dr. Deep. The sword that the latter was holding is scooped up in the air and sticks to the ground in front of him. A trapped Dr. Deep tries to get up but isn't able to do so. Shadow is punched repeatedly by Alpha Grim Sonic.

"Is that all you got?"

A large group of Grim Sonics join the Alpha. The regular Grim Sonics take off and approach Shadow. They leap and dive towards him in slow motion. They crash into him, watched on by Sonic and Gwen, who realizes their fellow hedgehog is now in trouble.

"Shadow!!"

With Dr. Don't running across the background, Rebel and Knucks battle more Grim robots. The Grim Rouge punches Rebel causing her to fall. Sonic miserably looks at Prim and Gnarly who are also downed, with Prim getting hit by a flying Grim robot, laid out. Hangry collapses into a crystal wall. Froggy, struggling, croaks and flops down and T'Challa being take down as he moans. Sonic and Gwen looks at the horde of Grim Robots. Cut to Nine at the top of the tower.

"Come to me, Sonic." Nine said.

"Nine!" Gwen yelled furiously.

Gwen skates into the horde of Grim Robots, sending them flying.

"Sis! Wait!" Sonic yelled, but she wasn't listening.

"Gwen? No! She isn't supposed to come up here. I need Sonic." Nine said.

Gwen speeds out to the top of the tower and lands opposite of him. They growl and go to tackle each other. Just before they collide, the frame stops with both of them in mid-air.