*Prologue*
*San Francisco, CA*
After the fight with Chaos in the city, the buildings are getting restored by the people and the heroes. Speaking of heroes, the blue hedgehog zips through the streets, checking on everyone to see if they are alright. The blue hedgehog's name is Sonic. For years, he saved the world from the evil scientist, Dr. Eggman, who wants to build the Eggman Empire. But so many times, Sonic beats him every single time and Eggman always failed. Without help of his friends like Tails, the twin-tailed fox boy who builds machines, and Knuckles, the guardian of the Master Emerald.
"SONIC!" A female voice called. Sonic stopped at his tracks and turned and saw a pink hedgehog running towards him. "You won't get away this time!" She yelled.
"Amy, for the last time! I am NOT going out with you!" Sonic yelled as he starting to run in full speed. He is hearing Amy's yells and complains. Amy Rose wants Sonic as her boyfriend, or what's even better for her is to have him as her husband. Sonic definately doesn't want to do that with her, not for his sake. Of course, Sonic doesn't hate her, he only likes her as a nice friend who likes to help when he needs her. And he remembered what happened a few days ago before Chaos was around.
Sonic had his arms crossed and made the annoyed look on his face as he watched Amy standing on front of him, wearing a white and pink dress, which happened to be the wedding gown, and had some flowers in her hair.
"Oh Sonic, there's something I have always wanted to ask you, will you be my true husband? And have many, many babies?" She asked as she cupped her hands together. Sonic blinked, still making the annoyed look.
"Oh gosh, Amy..." He sighed by shaking his head. "I am NOT going to marry you! First you ask me out, then you send me love letters, and NOW you are proposing me! No way, Amy!" The pink hedgehog made a mean look at him.
"Sonic! If I can't have you, then no one can! So, what is your answer?!"
"I just said it, but I guess I have to say it and do this!" Sonic replied as he made a grin. "Amy Rose, my answer is..." He cleared his throat and raised his hand above him and sang out. "Noooooooo..." And then he ran off to the park, leaving Amy all speechless.
"...Did he just sing?" She asked.
Sonic ran towards the door of Tails' lab and fell upon the couch and groaned loudy. Tails came in the living room with safety glasses on.
"Sonic? What happened?" He asked as he came towards the couch. Sonic looked at him.
"Amy, that's what happened." He replied. "Geez...that girl couldn't get over me. And you are not gonna believe what she-"
"Is she asking you to marry her again?" Tails asked with his eyes half lidded. Sonic is silent, but nodded.
"Sort of. But it sounded like she wanted to go out with me for dinner, and then ask me to marry her. I have to keep telling her no." Sonic said. "Tails, please, help me out." The fox chuckled a little.
"That's your problem, Sonic. I can't help you out with this one. Besides, I have to finish my plane that is a my new walking plane." Tails said by going back to his lab. Sonic followed him. There's a plane that is torn apart, but there are robot-like legs.
"Hmm, so you are redesigning your Tornado? Very interesting." Sonic said. Tails nodded with a smile.
"This will be useful when this is done." He said. "So Sonic, since you are here, what are you gonna do now after Chaos is gone?"
"Oh nothing as usual. I'll probably go out for a vacation, or still run around for a new adventure." Sonic said with a grin. "No sign of Eggman, nothing. So, why not relax for a bit until then, huh?"
"Yeah, same here. And, wonder what our old enemy is doing now?"
"That blue hedgehog will have to face my new plan that he will never beat." Said the voice in the shadows in the computer room. He came out of the shadows, Dr. Eggman. He sat down in front of his screen and started to type. "And G.U.N. made new robots to keep me out of sight from the city. Hmph! I'll show them..." Eggman typed something and then pictures of the robots made by G.U.N. and then a picture of the question mark. The villain is curious about it and clicked on it, but the screen popped up and asked for a password. Eggman typed his password, and it lets him in. The picture showed the photo of the old man who is bald and had gray and white mushtache. "What?! It can't be...!" Eggman said in shock as he sees the photo. Then the little robot appeared on the desktop.
"Dr. Eggman, what is it that you have seek?" It asked.
"Orbot, take a look at this!" Eggman said. "G.U.N. had a photo of my grandfather! Professor Gerald Robotnik, the world's greatest scientist!"
"What made G.U.N. think to have this old photo of your relative?"
"That I am going to find out." Eggman typed on the keyboards, the screen asked for a password. He typed the password that his grandfather might use, but the error appeared. The evil doctor tried again with a different password, but error. "Rrrgh! What is my grandfather's password?!" He asked in anger. Then a name came into his mind. "Wait...let me try this one." Eggman started to type. "Ma-ri-a." Then the screen showed the diary and old photos.
"That did it." Orbot said. "But who is this Maria?"
"One of my family members that I despised. Now I want to see what my grandfather kept in here for these fools!" Eggman said as he scrolls down, but stopped as he caught something that really interests him. "Orbot, listen here. This is one of the diaries of my grandfather after this 'accident'."
"I am all ears, if I had them."
"Quiet! Now listen... 'Based on my original projections, I was able to complete my project, Shadow. I designed its mind to be perfect, pure. I will leave everything to him. If you wish, release and awaken it to the world.'" Eggman read on the screen.
"What is this 'Project Shadow'? And what does it do?" Orbot asked in wonder. Eggman grinned as he finished through the diary about this mysterious project of his grandfather's.
"Heheheheh... This project of my grandfather's will be a good use. But it's held in Prison Island for...50 years." Eggman said. He then stood up from his chair and made the evil smile. "I will awaken Shadow. And afterwards, we will both take over the whole world, and nothing, not even Sonic the Hedgehog is going to stop me!"