A/N: well I had another idea for a crossover and after some talk among friends it sounded like with the right story this could work so I am going to give it a shot and post this chapter and see what kind of reception it gets. Anyway this is my first Sonic and Gundam Seed crossover taking place during Gundam Seed with the first chapter taking place at the start of Eggman's career as an evil genius bent on world domination.

Although its crossover with Sonic it's a little loyal to the video game and Sonic X version of Robotnik with a bit borrowed from the SatAM, Sonic X and OVA to add to the story, but mostly kinda AU for story sake.

Summary: After years of repeated failures to conquer Sonic's world; Eggman decides to finally return home to Earth where he finds his home the PLANTs at war with the Alliance. As Eggman joins the war to crush the Alliance a new rising group of heroes must rise to the challenge to not only stop Eggman, but his young son from conquering the Earth and end the war before both sides destroy one another.

Anyway the first chapter I think turned out ok and I am curious to see the kind of reception it gets and I am also looking forward to expanding on Robotnik's back story I devised for him just for this story beyond what is mentioned here in the first chapter. It will probably take me a little time to post a second chapter since I got two other stories I want to keep up on. Their chapters would have been posted by now had it not been for some computer problems I suffered during the past week. But I am back in business and those chapters should be up soon, but in the meantime check out this new experiment of a fic I made and tell me how it looks so far. If it's well received I'll continue it and make things more interesting if I can.

Also other characters will appear like Shadow, Omega and etc.

Chapter 1

The Return of Eggman

(Fifteen Years Ago)

It was a cool evening as the last light of the sun was fading from the interior of the PLANT colony of December Three as a man wearing a blue long coat was walking down the street towards the main gates of a walled off estate filled with trees and lush grass surrounding a two-story mansion in the center. After receiving clearance from the guard at the gate the visitor entered the grounds and began making his way towards the mansion at the heart of the estate.

The man had a pale complexion with short blonde hair and gold eyes wearing a white collar shirt underneath and black paints with matching shoes.

When the visitor arrived at the door; a servant the butler of the residence let him into the large home before showing him to the study where the master of the estate was currently residing. The visitor entered the large room that had bookshelves lining the walls and a large wooden desk sitting in front of a large window that provided a wonderful view of a large lake in the distance. Near the heart of the room was a small elaborately polished wooden coffee table lined with gold and leather couches around it.

Seated on one of the couches with his feet up on one side and his head resting against the armrest on the opposite end was the man the geneticist had come to see especially hearing about an unfortunate turn of events that had taken place a few days ago. On the ground surrounding the couch were used tissue bundles along with a few empty tissue boxes littering the ground nearby as well as a few empty bottles of prune juice and a half filled class sitting on the coffee table.

The man lying on the couch was a large man in his early thirties weighting at least over two hundred and fifty pounds with broad, highly elevated shoulders, a round, egg-shaped physique and long, almost comically-proportioned arms and legs. He had a small dome-shaped bald head with small grayish-blue almond shaped eyes and his signature feature his giant, unkempt-looking, rugged and scruffy brown mustache.

The egg-shaped man was wearing black dress-paints a red long sleeved collar shirt with the top buttons undone. His black polished shoes, white gloves and yellow tie were lying on the ground nearby among the discarded uses pieces of tissue.

"I heard what happened Ivo…Patrick explained everything to me." The geneticist began as he stepped into the room. The crying man turned and looked up seeing the younger man entering the room.

"Ulen, why are you here?" Ivo Robotnik said bitterly to his friend Doctor Ulen Hibiki.

"I am your friend…when I heard the unfortunate state you had ended up in while I was visiting the PLANTs on business I decided to come to check on you as your friend."

"What do you know about what happened?" Robotnik said as he sat up using a still fresh tissue to dry his eyes of the latest tears he cried during his moments of self-loathing and sorrow as he tried to pull himself together to engage in a conversation with his friend.

Ulen sat down on the couch opposite of Robotnik as he answered "Only what Patrick told me…it was basic, but I heard Mina had cut her ties to you to devote herself fully to her chosen husband and their daughter effectively leaving your newborn son in your sole care without a mother."

Ivo Robotnik almost broke down again as more tears began pouring from his eyes as Ulen had hit the mark.

"I loved her Ulen…why…why was she deemed compatible and only able to marry HIM and father HIS children. I am not a coordinator so I don't understand what the problem could have been." Ivo said before he broke down completely into another fit of crying and sobbing.

At least the man stayed away from the alcohol. Ulen thought while thankful that Robotnik had kept to drinking a lot of prune juice instead of indulging in liqueur. In the years he had known the egg shaped scientist since their collage years Ulen had never seen the genius inventor in such a sorry state of serve depression. In fact he was more so surprised by the fact that Ivo hasn't attempted suicide…yet.

"She said…she said…for the good of the PLANTs and for the sake of the movement, the Zodiac Alliance…she had to cut her ties with me. If anyone knew we were still seeing each other and discovered we had a child together while married to HIM it would have destroyed his political career and ended the movement. Luckily no one found out and HE was away on Earth for a long trip trying to gather funds and resources for the moment from his home country…so he doesn't know about our child." Robotnik said as he struggled to speak those words while trying to control himself, but his heart was broken.

"I…I am sorry Ivo…I wish there was something I could do. I was surprised to hear that Mina wasn't compatible with you considering you're not a coordinator. Not even including the fact that you are the grandson of the man who played a major role in the birth of George Glenn effetely making him the father of all coordinators."

Ulen was at a clear loss for words since he was genuinely surprised when he had heard that Ivo and Mina were deemed incompatible, but instead an arrange marriage between Mina and Patrick's friend Siegel was to be done since they had apparently had the most compatibility genetically.

"It's…not your…fault, but damn it how could have this happened?" Ivo said as he gripped the glass tighter in his hand until it shattered. In a sudden burst of rage Ivo threw his glass across the room where it smashed into a wall breaking into a hundred small pieces. Ulen rose up from his seat and walked over to Ivo's desk where he had extra glasses located. As he grabbed a new glass for his friend the middle-aged doctor eyed the scattered designs and blueprints for new robots including a new spaceship Ulen knew Robotnik was having secretly built a new kind of space ship he designed to allow him to travel beyond the solar system and into the unknown and unexplored regions of space.

Ulen returned to the table where he sat the new glass in front of his friend before pouring him a new drink with what little juice remained in the bottle.

"If I may suggest Ivo…you should do something more creative with your talents. You can't waste away in your study mourning your loss. You have a son to take care of now and how will he think of you if he grows up seeing you like this."

For once Ulen had left Ivo speechless.

"You are without a doubt the most brilliant scientist and inventor in the PLANTs I am positive someone of your genius can do something to change things."

"Change things" Ivo muttered.

"Yes your proposal for a new type of all purpose humanoid like machine…you called it a mobile suit is being looked over carefully by the Zodiac Alliance and the PLANT leaders…when the time is right I am certain this new technology will begin an era of a new type of machine…and weapon. They believe you have come up with the concept for the idea of a possible all-terrain and multi-purpose machine, just as your grandfather Gerald was responsible for George Glenn and in turn coordinators everywhere you may find yourself the father of these mobile suits."

Robotnik was silent once again as he was momentary caught up with his own thoughts so Ulen continued.

"But this is only the tip of the ice berg I am positive you can invent something greater that could cement your place in history just as your Grandfather had done with George Glenn's birth and the rise of coordinators."

Robotnik looked up as some spark had returned to his eyes as if the good doctor had returned to life with a new sense of purpose in those eyes of his having been greatly inspired by Ulen's words. Ulen saw that he was getting through the depressed scientist.

"You're right Ulen…I can build and create just about anything with my great intellect and these hands. I lost the love of my life, but I have a son. I have a reason to live still and I see what I must do now."

Ulen was relieved that he had gotten through and brought the doctor out of his state of depression and back to his old self apparently.

"I am glad I was of some assistance. I can come back tomorrow if you want to talk some more Ivo. I still have a few days before I have to return to the Mendel Colony."

"Certainly…I have some plans about a little trip I am planning on I would like to talk to you about. Can you come back tomorrow afternoon? I am curious to hear about the success of your Ultimate Coordinator Project you mentioned in your last letter to me."

"Certainly and I wish to see your son tomorrow as well."

"Of course"

After bidding his friend good bye Doctor Robotnik made his way up stairs where he walked to a small nursery where his newborn son was resting quietly. Robotnik looked down at the small tiny sleeping form of his son as he began speaking to the young infant.

"You may not have a mother, but you have me and I'll never leave you. Ulen gave me a great idea…with my genius and these hands I can build the idea world a new utopia the greatest empire the world has ever seen. And I'll build it for you, my grandfather was unjustly executed by the government of the Orb Union for his experiments and his desire to help humanity and now I lost my wife to unnecessary arranged marriage. I'll change everything I'll take this world apart and rebuilt it uniting it under one rule…ruled by you and I alone. Someday my son we'll rule this world and maybe even the universe as father and son." Robotnik began laughing as he saw his vision of a new world order with him as its sole ruler where no corrupt politicians or those like Blue Cosmos trying to delay advancement of the human race had no place in his ideal world.

Robotnik would make it a reality no matter what it took and his journey beyond the solar system in his new ship was the key to finding the resources he would need, and perhaps a place to lay the foundation too. For the first time in a week since his son was born and Mina left him Doctor Ivo Robotnik felt alive again.

He will conquer the world and build his empire with his son ruling by his side.

Robotnik affectionately stroked one hand over the sleeping boy's head as the infant laid in a white crib with stuffed white chicken plush dolls around him and a chicken and egg patterned red blanket covering him.

(Present Day; Cosmic Era 71 January 1st)

In Orbit above the planet Mars a massive armada of spaceships had entered orbit around the planet collectively made up of hundreds of spaceships armed with heavy weapons and a variety of weapons while many of the ships were based off of a sea-creature like Mako sharks, Sawfishes, and Manta rays. However the flagship of the fleet was based off of a Whale Shark and was the largest and most heavily armed ship of the entire fleet easily dwarfing the other ships in size and armament.

On the bridge of the flagship; Doctor Ivo Robotnik stood on the bridge as he observed the robot pilots at the controls of his flagship as the mad genius watched hundreds upon hundreds of small manta ray fighters followed by large Egg-shaped unmanned mobile suits based off of his E-100 series robots armed with heavy, but compact energy weapons and a powerful thruster and maneuvering system.

Doctor Robotnik or rather Doctor Eggman as he had been called on the planet Mobius smiled at the deployment of his army as they descended upon a number of the colonies dotted over the surface of the red planet.

"Let it be known to all within the Solar System…Doctor Eggman is coming home!"

A/N: I thought it would best to keep the chapter short, Eggman is returning to Earth and he's bringing the Egg Fleet with him, modified and better armed for the story :). Anyway let me know how it looks so far constructive criticism welcomed as well as suggestions since this is an experimental fic to try out a new crossover I am doing.

Thanks for reading