The next day came and Y/N had arrived at G.U.N HQ to discuss the situation of the upcoming invasion between the Commander of G.U.N and with the president himself.

Mr president: Commander' Y/N robotnik.

Y/N: Mr president.

Commander: Sir.

Mr president: I bought you here today to discuss an issue regarding one of our systems satellites. It has detected a large object entering our solar system but we haven't been successful in identifying it.

Y/N: Hmmmm is that so? We don't want to ignore it not when the black arms could stage thier assault on earth at any time.

Commander: Yes we need someone to look into this immediately if this thing turns out to be the comet that the black arms are using as a transport then we need to mobilize evrey soldier we got to ready for the attack.

Mr president: Let's not jump to conclusions we still need someone to identify this object.

Y/N: I might have the perfect man for the job well when I say man I mean droid.

Commander: A droid?

????: He means me commander.

The doors of the control room slide open revealing a green tactical droid with a blaster in his left hand. The droid walked towards the commander and gives Y/N a salute.

Commander: What in the sam hell is that thing?

Y/N: This is kalani general of my droid army. He's a super tactical droid built to lead squadrons of droids into battle with tactical prowess. Why he may not be the strongest or the fastest droid in my army he is most certainly the most intelligent.

Kalani: Indeed aslong as I lead my battalion onto the field victory will be assured.

Mr president: Well General perhaps you could make sense of this unknown space object?

Mr president hands a copy of the satellites readings to kalani who scans the picture and deciphers what this object is.

Kalani: Hmmmmmm it is as I feared.

Y/N: Kalani what is it?

Kalani: From what I could decipher this object is a large comet but upon closer inspection at the end of the comet I saw a large group of flying creatures.

Mr president: Oh no.

Commander: They've arrived earlier then expected.

Y/N: Can you scan the surface of the asteroid and see just how many of these aliens are living on it's surface?

Kalani: Yes I will inspect its surface now.

Kalani scans the picture this time taking much longer to answer his creator.

Commander: Tell us already how many of these things are we dealing with!

Kalani: I've finished my scan and the rough estimate of the black arm population is between 5 million to 10 million.

Y/N: Oh dear god.

Commander: Do we have a estimated time for thier arrival?

Kalani: Calculating it's current velocity my accurate guess it that we have only mere hours before they arrive to earth.

Mr president: Then my freinds time is of the essence. Commander order your troops to evacuate metropolis we cannot afford to have innocent people getting caught in the crossfire between our forces and thiers.

Commander: Yes sir I will ralley my men now.

Y/N: I'll order evrey droid I have to mobilize and I'll get sonia and her freinds ready for the fight.

Mr president:I wish you luck Y/N robotnik may god protect you.

Y/N: May god protect you too Mr president.

Y/N ran out of the control room and headed towards his ship once inside kalani turned on the ships engines and took off while Y/N gave mecha sonic a call.

Y/N: Mecha sonic I need you to alert sonia and the others the black arms are are about to begin thier invasion have evryone ready for the attack and make sure that sage and cream are kept safe and sound.

Mecha sonic: Understood I will alert them immediately.

Y/N ended the call and mecha sonic walked into the house where evreyone was relaxing and having a laugh. Mecha sonic clapped his hands together to gather evreyones attention.

Tails: Huh mecha sonic?

Neo-sonia: What's with you?

Mecha sonic: I have just received a call from Y/N. Its about the black arms.

The mood in the room quickly changed to a carefree vibe to a more serious one.

Shade: What did he say?

Mecha sonic: He said that the invasion is only hours away he's already readied his army and G.U.N has begun to evacuate metropolis.

Sonia: Where's Y/N now!?

Mecha sonic: He is heading towards metropolis to help his troops on the front line me and silver sonic will also be there to assist him in the assault.

Knuckles: Oh no we're not gonna let him have all the fun we're helping him too!

Silvia: He's stood for us when we fought eggman so it's only right for us to stand with him against the black arms.

Blaze: Then what are we waiting for? Let's get to metropolis and give these aliens a piece of our mind!

Evreyone: YEAH!

Sage: Please make sure that my brother will be safe.

Silver sonic: Do not fret no harm will come to him I will give my life to protect him if it comes to it.

Timeskip

At metropolis city square squadrons of battle droids and G.U.N soldiers marched through the streets the civilians had all been evacuated and now they only thing that the two factions could do was wait for the inevitable invasion. AAT'S Drove through the empty streets while others sat idle on the outskirts of the city weapons primed for battle. Y/N and kalani were on top of a skyscraper keeping an eye of the sky. Magnaguards guarded thier leader while commando droids scattered around the city with thier squads hiding out of sight hoping to gain a tactical advantage over thier enemy. Behind Y/N sonia and her crew teleported to his location thanks to shade and her use of chaos control.

Infinetta: Y/N.

Y/N: Girls there you are glad you got here in time.

Amy: Any sign of them yet?

Y/N: No but its only a matter of time until they arrive is cream and sage safe?

Rouge: Yeah there back at Vanilla's place keeping low until it all blows over.

Y/N: (sigh) Thank god the last thing I want is for them to get caught up in this and get hurt or worse.

Y/N looked at mephiles who was shaking in fear scared to face her creator after her betrayal. Y/N wrapped her into a hug to try and calm her.

Mephiles: H-he's here i-i can feel his presence Y/N i-i-im scared.

Y/N: Don't be I not gonna let anything happen to you or to anyone here you have my promise.

Metal sonia: Just don't die on us got it?!

Y/N: We're all gonna get through this no ones dying on my watch.

A battle droid runs to Y/N and salutes him.

Battle droid: Sir we've just gotten a report from G.U.N the comet has just entered earths atmosphere they're here the black arms are here!

Silvia: This is it do or die!

Omega: Many will be terminated by hand.

Mecha sonic: I look forward to see much alien blood I can smother my hands with.

Sonia: Ready evreyone?

Amy: More then I'll ever be.

Shade: Do you really need me to answer that?

Y/N: Let's do this guys.

Then suddenly the sky began to darken dark red clouds covered the sky and a large vortex spun around in the sky. Then from the vortex hundreds if not thousands of black arm soldiers floated down from the sky and landed in the streets of metropolis.

Moments later the sounds of gun and blaster fire rang out across the cities G.U.N forces and battalions of battle droids fired evreything they've got at the invaders who returned fire the massive brutes tank most of the attacks letting the weaker grunts stand behind it and use it as a shield and fire at the soldiers who are forced to take cover.

Vanilla watched from her home as the invaders began thier crusade of choas while she pulled sage and cream into a hug hoping that Y/N and the others would come out on top.

Vanilla: Be safe Y/N........please.

Inside the ark eggman watched from space as the earths atmosphere became clouded in a red mist he turned a moniter on to watch the news and saw his son fighting alongside sonia and G.U.N on the frontlines his golden lightsaber cutting through thier skin like a molten knife through butter. Cubot and orbot put thier hands together and prayed that Y/N would be safe eggman took out a picture of him and his son when he was only a child. He was standing next to him and his mother with a cheeky smile on his face. Eggman put the photo back into his pocket and curled his hands into a fist and walked out and headed straight towards the hanger.

Y/N rushed into battle with mecha sonic by his side slicing through the enemy forces. Two flying creatures swooped towards Y/N only for mecha sonic to boost towards them and grabbed them crushing thier skulls in with his bare hands. Silvia used her powers to hurl a car at a brute blowing the car sky high and reducing the alien to nothing more then a bloody stain on the street floor. Blaze kicks away a grunt when a squad of aliens lead by a brute surronded her and began to close in. Blaze held her arms together and moments before the aliens would grab her she unleashed a blast of flanes of heat incinerating the aliens. Amy swung her hammer at a pack of grunts sending them flying towards silver sonic who used his spindash to cut the aliens in half. Rouge flew above a squad of grunts and dropped a flashbang grenade blinding them giving shade to opportunity she needed to teleport from cover and kick an incoming flying alien then teleport to the blinded aliens and slam her fists into one of the aliens and then kick the last one.

Suddenly from the ruins of a skyscraper a group of aliens jump down to grab shade when omega aimed his arms towards them and activated his minguns ripping the aliens to shreds.

Knuckles charged towards a brute and pulled it into an armlock tails got behind the alien and fired her blaster stunning the alien letting Knuckles overpower it knocking it to the ground and slammed his fist into its head. Sonia used her speed to race on the walls of the buildings and jump and bounce off the flying creatures. Even scratch and grounder were putting up a good fight with grounfer using his arms to drill through the hides of the invaders and scratch used his beek to peck out thier eyes Yes scratch was pecking the aliens to death.

Infinetta stood by neo and metal sonia using the power of the phantom ruby to make phantom clones of herself which sped towards the aliens. On impact the clones exploded into many dark cubes which impacted the aliens at high speed badly injuring them. With the aliens weakened neo and metal sonia spindash towards the enemies neo-sonia grabbed a grunt and slammed him into the ground caving his skull in while metal sonia kicks a grunts chin knocking it into the air and when it was close to hitting the ground metal sonia gave it one final kick in the chest sending it flying into the remains of a burning bus. A brute charged at the two but a long sword impaled the creature which dropped dead showing that it was mephiles who had killed the alien.

From on top of a skyscraper kalani alongside the commando droids observed the black arms and thier tactical and battle strategies seeing if thier were any weaknesses in thier attack. After giving enough observation kalani orders the droids to surround the subway station. The station was heavily occupied by the black arms and kalani wanted to thin the number by a large margin so by his orders a battalion of droids and a set of AAT's to lay an assault on the metro station but first he contacted Y/N to make him aware of his plan.

Kalani: Sir I've ordered the troops to surround and attack the metro station which is heavily populated by the invaders.

Y/N: Alright understood me and mecha sonic will head there now and help with the attack.

Y/N and his forces hurried towards the metro station once there he ordered the AAT's to open fire blowing a hole through the wall of the station killing any aliens nearby. Magnaguards ran in first and used thier staffs to shock and push back the brutes. Mecha sonic boosted in and stabbed his hand into the brutes flesh and tore its heart out.

Mecha sonic: Kill them all show no mercy!

Y/N used his lightsaber to deflect blaster fire back at the aliens he then used chaos control and slowed down time to cut down the remaining aliens in the area. Y/N took one look at the of the station and then turned towards mecha sonic.

Y/N: This place is bigger then I thought if we want to rid the station of the black arms we're gonna need to split into two teams. Mecha sonic you and the magnaguards will take the top floor while me and the commando droids will take the basement level.

Mecha sonic: Understood come magnaguards the hunt has only just begun.

So the two teams split up and Y/N and his team ran downstairs to the dark basement. The basement was a large area filled with things like workshop items for train maintenance and ladders mops and buckets for cleaning the station. There was also a large group of aliens and the walls were covered in a wierd purple and red goo. Y/N and his troops ran in and opened fire but Y/N was not prepared for the aliens to bring out a large cannon.

Y/N ducked down just in time as the grunt fired the cannon reducing the commando droids to scrap. Y/N quickly ran towards the cannon which was cooling down before it could fire again and jumped on top of the cannon and swung his lightsaber decapitating the grunt and then slice through the cannon destroying it. Y/N looked around and saw that a small army of aliens had surronded him with no way out and with no backup or assistance.

Y/N: All this manpower for little old me I'm touched........but your gonna need more then that to take me down.

Y/N deactivated his lightsaber and took off his coat. He then twisted his weapon to its side and once again ignited his lightsaber but this time the golden light came from both sides of his saber revealing his new double bladed weapon as he spun it around and charged towards his enemy.

The aliens fired at Y/N who easily deflected the attacks back towards the grunts and cut down down the aliens with a deadly finesse. Some of the grunts got closer as they shot at Y/N which made them easy prey. One grunt ran towards him and Y/N deflected his attack and slashed his chest and kicked the grunts body back towards his allies.

One by one the grunts fell to the tip of Y/N's blade a brute went for Y/N who jumped over it and impaled it through its back kicking the lifeless alien to the floor. From the distance Y/N saw a trio of aliens each wearing a set of armour and were holding a sharp sword.

(Replace the gun with a sword)

The three aliens ordered the grunts to charge at Y/N who charged towards the commanders. Y/N ran and jumped over the remaining grunts kicking one in the face and stabbing his saber through the head of a other alien.

He spun his lightsaber around which cut through the last of the grunts one of the commanders charged towards Y/N and went to strike Y/N. Y/N dodged a swing then jumped to avoid the second attack and the commander went for another blow but Y/N grabbed its hand and crushed it forcing the commander to let go of his sword.

Y/N then went on the offensive and used the hilt of the lightsaber to push the commander back then Y/N kicked the commander and swiped his legs knocking the alien to the floor then bought down his saber impaling the alien off camera which shows the second commander screaming for his dead freind.

Fueled by rage the second commander carelessly rushes towards Y/N while the third commander watched. Then from off-camera Y/N sends the second commander flying past the third slamming into the wall and dropping down lifeless.

Now the third commander focused on Y/N the sword in his hands remained calm and steady he was the more experienced out of the three he knew not to underestimate his opennant. The two fighters circled eachother waiting to see who would make the first move. The first strike came from Y/N who thrusted his saber towards the commander who blocked the attack and pushed Y/N back. The strikes from the two combatants became faster and faster Y/N refused to lose his ground and the commander vowed the same promise Y/N went for a flurry of attacks which the commander blocked but was slowly being pushed back by the skilled warrior.

The commander took one gaze behind him and saw one of the dead commanders he quickly blocked another blow and rushed to his dead comrade and picked up the sword.

Y/N: Duel wielding huh? Alright its that's how you wanna play-

Y/N stands back and presses a button on his saber which detaches into two lightsabers.

Y/N: Then let's play.

The two once again enter combat the commander attacked Y/N who used his sabers to block the strike but now the commander was giving it evreything he had and with each strike he pushed Y/N back. As he was about to push Y/N into a corner the boy goes on the attack and blocks a strike and when the commander goes for another Y/N parried the attack and kicks the commander back and jumps forward and continues his barrages of attacks.

By this point the two fighters are on the verge of collapse they had grown tired by the fight but still they fought with everything they had. But after minutes of fighting Y/N was now pushing the alien back the fight was nearing its end. Y/N struck the commader who blocked the attack but the force of Y/N's swing knocked the sword out of his hand. The commander makes a fatal mistake and attacks Y/N who jumps over the commander who tries to strikes at Y/N from behind but Y/N kicks the commander stunning him giving Y/N the opening he's been hoping for. Y/N twirled his blades and ran backwards impaling his opponent with his lightsabers.

Y/N deactivated his lightsabers and looked at the commander who took one last gaze at Y/N before collapsing to the floor and died. Y/N breathed one massive sigh of relief having finnaly defeated the skilled alien warrior he walked towards the exit but suddenly the world around him began to become distorted and after a few seconds Y/N found himself floating around in space. Nearby was the ark and futher off into the distance was the black comet which was hovering over the city of metropolis.

Y/N: What type of illusion is this? How the hell did I end up here?

????: Y/N.............

Y/N: Huh who said that who's there?!

Suddenly from out of nowhere a wierd starfish like alien with a large eye floated from behind Y/N and was now meters away from Y/N. Then the creature changed shape and became a creature that had no lower body and with three eyes. Y/N didn't need to guess who was infront of him he knew who this creature was because of what mephiles told him. It was black doom the leader of the black arms the one who sent mephiles to earth to obtain the choas emeralds and use them to help with earths destruction.

(Ayyyyy whatsuuuuup it's da devil from da bible)

Black doom: Y/N robotnik.

Y/N: So your black doom the creature that mephiles warned me about?

Black doom: She was wise to warm you of me but that will not pardon her for her betrayal.

Y/N: You will not lay a hand on her not while I draw breath!

Black doom: So you say yet unlike your father you can back up your ego with skills. I observed your fight with one of my commanders impressive very impressive not many can achieve such skill.

Y/N: What do you want? By the way your trying to butter me up I know that you want something from me.

Black doom: Perceptive boy I am here to offer you a place in my legion. Your intellect and combat prowess would make a excellent addition to the black arms.

Y/N: do you honestly think I'd work for you? You dellusional I'm not going to join you while your army decimates earth and slaughter my freinds!

Black doom: Hehehehehehe stubborn are we? It matters not I have many ways to get the results I desire it will only be a matter of time until you submit to me willingly or not.

The world begins to shift back to inside of the basement and black doom slowly begins to fade away.

Black doom: Go Y/N robotnik keep on fighting your futile battle we will meet again in due time.

The world reverts to normal and black doom fades away. Y/N grips his lightsaber tightly as he walks back upstairs to find mecha sonic as the screen fades to black.