In Hawaii, the sounds of ukulele was being played as Rachel and her fiance are getting married where the pastor is standing in the middle, speaking the will.

"These rings signify the commitment--"

He was cut off by "Green Hill Zone" ringtone coming from Tom's phone. They all look at him as he struggled to find his phone.

"So help me, Thomas!" Rachel yelled in annoyance.

"Sorry, sorry."

Tom picked it up to see Sonic's profile and answered.

In the middle of the avalanche, Sonic and Y/N are snowboarding while he's holding the unconscious Tails, much to Y/N's worry, as he calls Tom. Y/N looks back at the avalanche that's coming closer.

"Life or death situation! I need you to use the ring to save us. Like, right now."

"Yeah, we have a bit of a problem on our way!"

Y/N sees the Egg Bots flying towards them. She then noticed Knuckles is catching up.

Tom throws the ring to where Rachel and her fiance stand and opened the portal where they can see Sonic, Y/N, and Tails snowboarding away from the avalanche. Everyone was surprised.

"Snow my God." Rachel gasped.

"Oh, boy." Tom mumbled.

"Incoming!" Sonic warned.

Before he, Y/N, and Tails could get through, Knuckles tackled Y/N to the side as they went rolling, leaving only Sonic and Tails to go as they crashed through the wedding. Everyone moved out of the way as a pile of snow comes through, covering them all.

"Ah, Hawaii." Sonic groaned, sitting up and all covered with snow.

"I just hope we're not too late." Tails said in determination, who's in Green Hills.

"Oh, Lord, there are two of them now." Rachel stuttered, staring at Sonic and Tails.

"What's happening?" Maddie asked with worry.

Tom and Maddie came up to Sonic and Tails.

"Okay, quick version: Robotnik is back."

In space, a big blue explosion was made and a big white egg-shaped ship is coming down to Earth. Robotnik's laughter was echoed as his ship made a safe landing. Robotnik comes in through the coffee shop where Agent Stone worked.

"I've discovered the source of ultimate power."

Robotnik's hands hovered over the floating Master Emerald, feeling the power radiating off of it. Skip to where Robotnik and Knuckles were shown together, with Y/N all tied up as Knuckles held her by the arm rather gently, parting the sea showing the entrance to Master Emerald's lair.

"Oh!" Robotnik exclaimed in surprise.

"Whoa!" Y/N exclaimed, just as surprise as him, making Knuckles smirk at her.

Sonic walks to where Robotnik, Knuckles, and Y/N have gone, eyeing the temple of the Master Emerald.

"We need to get it back or the world is doomed."

In Mushroom Planet, the portal ring showed a shadow figure of Knuckles coming through, eyes glowing red.

In Green Hills, Knuckles crashes through the truck, chasing after Sonic, Tails, and Y/N, who're in the police car with her brother driving.

"You brought some kind of..." Agent Stone started, staring at Knuckles, who walks in.

"Hmm." Knuckles grunted.

"...space porcupine."

Knuckles twisted his arm after Agent Stone held out a hand for him to shake, making him yell in pain and kneel on his knees.

"Ohhh!"

"I am an echidna warrior."

Unfazed, Robotnik takes a sip of the latte Agent Stone made for him. He smacks his lips with a hum.

"Hmm."

"Hedgehogs..."

Tom, Maddie, and G.U.N. Agents stand before the green tornado.

"...it's time to say goodbye to humanity."

G.U.N. Agents held out their weapons at the coffee shop as Robotnik comes out, floating mid-air, his black suit covered in green all powered up by the Master Emerald. He blasted out green lightning towards the vehicles as he tore them apart, creating a Death Egg.

"Welcome..."

Robotnik begins to float, creating a tornado in the process.

"...to the new norm!"

In the ice temple, Sonic, Y/N, and Tails walks in towards the statue of Longclaw.

"This is your moment to be the big hero." Tom advised.

Sonic, Y/N, Tails stares up at the statue in disbelief.

"Bad time to say this, but I don't actually have a plan."

"Seriously?!"

Y/N reads the ancient words below the statue, eyes and necklace glowing green, and flips them, knowing the code. It causes the statue to move and raise its wings and the entire room to glow green. Suddenly, the red dot was on Tails' head. Sonic and Y/N noticed it.

"Hey, you got a little something on your--"

Tails taps his head with a finger to find nothing until more red laser dots are pointed at him.

"Uh, guys?"

Y/N pointed at something up ahead. They looked up to see Robotnik riding his Egg Mobile with Knuckles holding onto the side along with the flying Egg Bots.

"Oh, boy." Sonic frowned.

"Someone call an Uber? It's cold in here." Robotnik joked.

More red laser dots are pointed at Sonic and Y/N's head. They glare up at Robotnik and Knuckles as they're completely surrounded.

"Let's turn up the heat."

Robtonik presses the button and activated the missile and launched it at them.

"Sonic! Y/N!" Tails shouted.

Sonic and Y/N spin dashes at the Egg Bots and crashes it. It explodes and in slow motion, they caught the parts of it and launches out of the mountains of snow. They uses it as a snowboard as they skid their hands through the snow before placing their feet on it, gliding down the snow.

"Hoo hoo hoo!"

"Yeah, baby!"

Through the firey smoke, Knuckles appears with a snowboard he took from the Egg Bot and lands with a grunt, catching up to Sonic and Y/N.

"Oh, great. The Winter Soldier." Sonic growled.

"Why am I friends with him in the first place? He's too good!!" Y/N groaned, rubbing her face as she snow boards.

Knuckles comes between them and knocks Sonic to the side of the rocky wall. Y/N glares and kicks Knuckles in the stomach, causing him to kneel in pain while snowboarding.

"No one hurts my brother like that!"

In Seattle, Sonic comes inside the truck and kicks the robber off.

"Fear not, citizens."

"You are terrible at this!" Man glared at him.

"Your negative attitude is not helping." Sonic glared back.

"He's not wrong." Y/N said, looking at the road ahead of them.

"Hey! I'm trying!"

The robber tosses the bomb into the sewer that causes the waters to sprung up. Sonic and Y/N jumps out of the truck and speeds away.

"Ha ha ha haaa!"

Tom and Maddie drive after Sonic and Y/N, who're down and injured from the blow of Death Egg behind them with the Master Emerald just a few feet away from them.

"We stick together. No matter what." Tom said to the injured Sonic and Y/N.

Y/N helps her brother up as he picks up the Emerald before being carried inside the truck by Maddie just as Death Egg was about to step on them.

Knuckles beats down Sonic that causes big red explosion.

Sonic, Y/N, and Tails flying the Tornado towards Death Egg.

"Unlike Y/N, you're unskilled..." Knuckles spoke.

Death Egg begins firing rockets at Sonic, Y/N, and Tails.

"Hang on!" Tails warned before flipping the biplane, dodging them all.

Sonic and Y/N held on tight.

"...untrained..."

Back in Hawaii, Rachel rides the golf cart and spins it around. Explosions and fires were made behind her as she gave a gesture to slicing her neck with a thumb.

Robotnik's body glowed green along with his eyes as he smiles maliciously.

"...unworthy!"

In slow motion, Robotnik dodges to the side for Knuckles to come straight towards Sonic with his fist up, glowing red. Sonic's eyes widened in shock as his fist glowed blue that was meant to punch Robotnik. Y/N comes down the stairs just in time to see what was happening as Sonic crashes through the wall and outside of the house, rolling around in the backyard. He got up, wiping his cheek.

"You forgot one."

Sonic kneels down in his running position, blue lightning coming out from his body. He glares up in determination as his green eyes turn to glowing blue ones.

"Unstoppable."

Sonic runs through the ocean, heading towards the Master Emerald's lair where the green light is.

In mid-air, Sonic punches Knuckles down to the ground, making a big hole. He skids back, managing to hit him as Knuckles landed on his back. Glowing Knuckles is now on the rocky ceiling as he glare daggers at Sonic and kicks himself off. Sonic lets out an angry yell as he flies towards Knuckles with his fist up. Then it showed Y/N standing in the middle on top of the temple where the Master Emerald is guarded. Sonic and Knuckles fly towards each other and collides their arms together in a big flash, glaring angrily.

"Stand still and die!"

Sonic is dodging Knuckles' rapid punches.

"For a guy named Knuckles, you are really bad at punching."

"I wouldn't say that if I were you." Y/N warned from above the Master Emerald.

Knuckles growled angrily and punched Sonic towards the waterfall before he could land a hit on him. Y/N sighed, shaking her head.

"Told ya."