Mario & Sonic: Crossover Chaos!


Author's Notes: This is my very first story written for I do not claim ownership over any characters mentioned in the story. All characters are either property of Nintendo or SEGA, and this story is for entertainment only (because I don't want to get sued). Also, notes and pointers from the author will be written in quotes such as these throughout the story when needed. One more thing, this story is heavily inspired by Sonic Rush, New Super Mario Bros., the Mario RPG games especially the Paper Mario series, and the Sonic the Hedgehog comics, get 'em while they're hot!


Chapter 1: Depression and Rage, a Plan is Hatched

Our story begins on a small, blue and green planet known by as Mobius; a prosperous little planet that is similar to, if not the same as, our own planet Earth. The specific location on Mobius, where we begin, is a city known as New Megaopolis; a large, very pollutant, and practically barren city, with the exception of a few hundred robots. This city is also the home of the evil and infamous scientist, Dr. Ivo Robotnik, a.k.a. Dr. Eggman to some. It is here, in New Megaopolis, that we find a sleeping Robotnik in the approaching dawn.

7:28 a.m., the evil tyrant was quiet and motionless in his bed. 7:29 a..m., the doctor rolled over and grunted, but was still fast asleep. 7:30 a.m., the clock radio beside his bed filled the room with noise, as it turned on the radio.

"GOOD MORNING MOBIUS!", the announcer on the radio station ecstatically yelled, "This in RBNK, on 91.6, New Megaopolis's #1 radio station, and this is what we have for you today!" The doctor opened his eyes groggily and got out of bed. He was wearing a white, sleeveless undershirt, and blue striped boxers. As he did this, the announcer on RBNK continued. "The weather for today is mostly sunny with some clouds moving in later on in the day with a high of 77 degrees Fahrenheit. Chance of rain: 22." Eggman looked out his window into his dark city. His cold blue eyes stared at the bright blue sky. He started to stroke his long, hairy mustache. As he did this, he began to think to himself.

'It's a beautiful day out today.', he thought, 'I bet Sonic is outside right now sleeping, while basking in the warmth of the sun.' It was at that moment, that Dr. Robotnik's mood suddenly changed from tired and groggy, to depressed and unmotivated. It was obvious that something was wrong about Eggman today. He usually had a little glimmer in his eye, and a smug, little smirk on his face, meaning that he had something absolutely dastardly planed for that day. But today, his eyes were just dull blue, and there was neither a smile or a frown on his face. Just the very thought of his blue arch nemesis, and his perky little friends, made him sick to the stomach. After one last glance of the outside world, Robotnik gave out a long sigh, and flatly mumbled out the word "Whatever.", as he walked toward his dresser to get ready for his day.

The downhearted doctor pick up his mini glasses, and placed them right on the bridge of his nose, as this was how he always wore them. He then made a grab for his metallic goggles. He usually wore these on the top of his bald head, but rarely ever used them. They were more for his looks. But, as he held them in his hands, he decided against the goggles for today, and slowly placed them back on the dresser. He picked up his white gloves, which he was never, normally, seen without on either. After some thought, the doctor sighed again, and put them back on the dresser, next to his goggles. Eggman opened his closet door. It was practically empty, except only three things that hung in there: his normal duds; which was a red tailcoat with four large yellow bottons on the front, and his black, latex pants that included his black boots, his classic clothes; which he wore in his younger days, a red shirt with a giant yellow collar, and a black pair of pants with two white bottons in the front, and finally, a light blue bathrobe. Robotnik didn't even think about it this time. He just grabbed the blue bathrobe and quietly slipped it on.

The torn up tyrant made his way to the kitchen, and he opened the fridge. There was some milk, last night's Chinese food, and some eggs. He quickly closed it and opened his freezer. Inside were some frozen waffles, a gallon of Rocky Road ice cream, a stack or two of frozen t.v. dinners, and a tray of ice cubes. He grabbed a spoon, and chose the Rocky Rode ice cream as his breakfast.

With the tub of ice cream in hand, he gloomily walked into his den, which to some people would be a technological paradise, and sat down in his recliner. He grabbed the remote control for the televison in front of him, and turned it on. The doctor now began to channel surf, while shoveling spoonfuls of ice cream into his mouth. This went on for another three minutes, until he was interrupted by a voice that was very familiar to him.

"Good morning father.", the voice had said cheerfully. Dr. Eggman ignored the voice, and shoved some more Rocky Road into his mouth. "Good morning father." the voice repeated. Eggman ignored it again and continued flipping through channels. "Father?", the voice questioned him. Robotnik couldn't ignore him much longer. Finally, he turned to his right ride to see what looked like a giant computer system. This was his latest invention, his new computer son, and humble servant, N.O.A.H. Stands for N.asty O.verriding A.pocalyptical H.ardware. N.O.A.H. is a loyal computer "son", that tends to Robotnik's every need, such a monitoring security cameras, or keeping stock count on Robotnik's weapons, for example. He was inspired by Eggman's former computer children, E.V.E. and A.D.A.M.

"Oh, hello N.O.A.H.", Eggman had greeted him glumly " How are you?"

"Father? Are you all right? You're not acting yourself today. My scans show that you have no major illnesses. If my data banks read correctly, aren't you scheduled to be working on you're latest project to take over the world today? The doctor took his eyes of his "son" and stared sadly at the t.v. screen.

"Oh, THAT... yeah I was", Dr. Robotnik replied, "But I've been doing some very serious thinking this morning, N.O.A.H., and I think that maybe it was about time I called the whole Eggman Empire thing quits, for good this time." N.O.A.H. hardly knew how to respond to this.

"...May I ask why father?", N.O.A.H. had asked this creator. The doctor gave out a long sigh and continued to flip through the channels on the t.v.

"N.O.A.H., in all the months that you've served me, do you have any idea how many times I've tried to conquer our world?", Eggman questioned with some irritation in his voice.

N.O.A.H. had responded, " My data banks can not give out a confirmed answer, translation: I don't know six, possibly seven times?" Eggman sank lower into his recliner.

"Hmph, try twenty-eight times! And do you know why my plans to take over the world, and construct the Eggman Empire always fail? It's because that irritating Sonic the Hedgehog, and all of his pathetic friends, get in my way EVERY TIME!" Robotnik had angrily explained.

"How so father? Could you please elaborate?" N.O.A.H. asked his "father".

"I've noticed that I seem to be in a rut. Every time I attempted world domination, I would always build a giant, super weapon, that required the power of the seven Chaos Emeralds. And every time I tried to collect the emeralds, either Sonic, or one of his friends would get to them before me or my robots, and then beat me to a bloody pulp! If I keep losing twenty-eight times in a row to the same people, it only shows that I'm just going to have my plans foiled again and again and again by Sonic! I have to face the facts that as long as I am in the same world as Sonic the Hedgehog and co., I'll never be able to conquer the world, and the glorious Eggman Empire will never exist. So I've come to the decision to retire early, and quit while I'm behind, to save myself the humiliation of another defeat.", Robotnik fully explained. He stopped channel surfing, as he found a program he liked., "OOOOOO, The Oprah Winfrey show is on! He shoved some more ice cream into his mouth.

For a while, there was silence in the room. Robotnik was concentrating on Oprah, and N.O.A.H. seemed deep into thought. It was almost like N.O.A.H. was searching for something inside of him. Finally, after about ten of fifteen minutes of Oprah, N.O.A.H. had suggested something that would change Eggman's entire outlook on things.

"Father, you stated that as long as you were in the same world as Sonic the Hedgehog and co., you would not be able to conquer the world. Why don't you just go to a different world and conquer that one?" The sound of this made him turn around to stare at his "son". He put the television on mute, so see could get a better hear at what he thought he just heard.

"What did you just say?!" Dr. Eggman asked with a mix of shock and humor in his voice.

"Forgive me father, but I have just done some light research on those Chaos Emeralds that you had mentioned. Apparently, these seven gems have an unlimited source of mystic energies and power. While they can be used as magnets to attract or repel each other, and other forms of mystic energy, they may also be used to travel throughout the fabric of space and time to many different places, or in some cases, different times! You are familiar with the term: Chaos Control, are you not?", Eggman nodded at his son. He was very familiar with chaos control. He has seen it first hand. Especially since it was what Shadow the Hedgehog, a Sonic look a like whom was a former ally of Dr. Eggman, was best known for. Not to mention the fact that Dr. Eggman, himself, used chaos control once see Sonic Advanced 3 for details.

"I think I see where you're going with this!", Robotnik stated with some interest. "Your stating that if I use the power of the chaos emeralds to use chaos control, I can, in theory, transport myself to an alternate world. One without Sonic, Tails, Knuckles, Amy, or Cream. Without them to stop me, I could easily take over that world, and finally build the empire that I deserve so much!"

"Exactly! And if I remember correctly father, aren't you currently in possession of one of the emeralds already?" N.O.A.H.asked. Dr. Robotnik had to think about this for a minute.

"Why yes, I believe I am. That's right, I remember! One of my robots had discovered it about two weeks ago while on the outskirts of New Megaopolis. I believe it's been in storage ever since. N.O. A.H., would you kindly send a message to the robot in charge of storage to bring up the emerald to me immediately? Eggman asked.

"Certainly father." N.O.A.H. replied. As Dr. Eggman waited patiently for his robot to deliver the emerald to him, so many thoughts were rushing in his head.

'This is it. This could be it! If this theory is correct, I might finally be able to be rid of that hedgehog and his annoying friends for good. No more Sonic the Hedgehog! No Sonic! No Tails! No Knuckles! No Amy! No Cream! No Chaotix! No Shadow! No Rouge! No more meddlesome pests! Just me, my robots, and my empire. Without Sonic and Tails in this new world, I can construct the Eggman Empire in a snap. I guess it really doesn't matter where it is, just as long as it is there to rule over something... or someone.' It was just then, that one of Dr. Robotnik's badniks entered the den. It was an average Eggman robot; short round and orange and in it's hands, was a small, shiny, grey gem resting on top of a fancy purple pillow with yellow frills. Robotnik immediately snagged it from his mechanical servant, without so much as a 'thank you'.As he held it, he couldn't help but chuckle.

"Of course, it's one thing to travel anywhere on Mobius, but to travel to a whole other dimension, huge amounts of energy are required. It will take you more than just one emerald to transport yourself that far. We will have to begin a search for AT LEAST one other Chaos Emerald immediately!" N.O.A.H. had instructed. Dr. Eggman fiddled with the Chaos Emerald in his fingers, then sat up straight in his seat.

"Oh, I wouldn't worry too much about that." Themaniacal madman said, now with a smug little smirk on his face, and a twinkle in his eye. "By the time that little blue rat finds out what I'm up to, I bet I'll be long gone. And besides, if this plan of ours works, and I am able to travel to an alternate dimension, I'll be unstoppable! No one would try to foil my plans there! Not this time! Who would even DARE to try to stop me? I ask you WHO?!

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We now temporarily take our leave from New Megaopolis. Actually, we now take our leave from all of Mobius on that note. For our story continues on another world. A blue and green planet, like Mobius, except this is a planet known to the locals as the Mushroom World. The specific location: a place known by as the Koopa Kingdom. This small kingdom is a dark and evil place, run by anthropomorphic human-like turtles called koopa troopas. We bring our attention to a huge certain castle, located on a ledge surrounded almost completely by hot molten lava. This castle is the home to the king of the Koopa Kingdom, the brute tyrant known as King Bowser, or just Bowser for short. It is here, that we find the big lizard king caught in a fit of rage.

"RRARGH! That's it! I can't take it anymore! I'm at my limit!", King Bowser had angrily yelled.

"Your evilness, sir, please, remember your blood pressure!" ,Bowser's evil assistant and servant, Kammy Koopa, practically begged in a sad attempt to calm down the king.

"No! I can't stand him! He does this to me every time! He makes me so mad, I could... I could... BLARGH!", And just like that, Bowser let out a huge breath of fire, accidentally charring many of his own troops badly.

"Sir, stop! Your men!", Kammy had yelled. Bowser calmed down enough to stop his flames. He looked around the room, and glanced at his badly burnt troops. His goombas, his koopa troopas, his magikoopas, and his hammer bros. received the most damage. He sadly shrugged.

"Sorry... I guess I lost control.", Bowser apologized. Although, Kammy could tell by the look in the king's eyes that he was about to lose it again.

"What happened? Was it the Super Mario Bros.? Did they thwart your plans again?", Kammy Koopa asked sympathetically. Just the names of his arch enemies filled Bowser with pent up rage. After a long pause of silence, Bowser finally answered.

"Yes!", the tyrant angrily answered, "It's just that Mario! He's just broke my last good nerve!"

"What did he do this time?", Kammy had asked with a sarcastic tone in her voice.

"Oh, the usual, I tried to kidnap the princess of the Mushroom Kingdom again last night. This time, Mario and his annoying brother stopped me before I could even make it out the bloody door!", Bowser responded irritably.

"Hmmm, that's a new record for them. Your losing your touch.", Kammy Koopa stated jokingly. The king was not amused. If anything, he kind of took it seriously.

"You know what, I think you're right.", said King Bowser, "To be honest, for some time now, I've noticed that my life has been in some sort of sad pattern. I kidnap Princess Peach, Mario goes after her, I send out my troops, he defeats them and makes it to my castle, we fight, I'm beaten an inch from my life, he saves Peach, and I end up worse than when I started out!", There was another pause of silence. "Not to mention all the times Mario has thwarted my plans of world domination, and the overthrowing of the other kingdoms of this planet!" Bowser sighed "I'm getting old Kammy. In about ten, maybe fifteen years, I'll probably be gone, and this kingdom of ours will crumble into the ground... more so. I know I can't trust the kingdom with any of my eight children. None of the are mature, nor experienced enough to hold the thrown."

"Oh sir.", Kammy had sympathetically said, "... Are you having another mid-life crises?", The Koopa King stared at her strangely.

"What?! NO!", Bowser had denied, "What I'm saying is that I'm starting to wonder whether or not are attempts to overthrow the Mushroom Kingdom are worth it! I mean... we're gonna have to face the facts. No matter how many times I've tried to accomplish something important to me, the Mario Bros. have always been there to spoil all my plans. And no matter how hard, or how many times I will try, Mario will always be there to stop me, no matter what." Bowser sighed again, "I'm just going to have to accept that as long as Mario is here to protect this world, the Koopa Kingdom will never flourish.", Kammy Koopa was staring blankly into space at first, but then, she jolted into attention, as if she was shocked with electricity.

"Wait, what? What did you just say? Say that again!", Kammy Koopa had instructed nervously.

"What?", Bowser asked in a confused tone.

"That last part you said! Repeat that again!", Kammy had ordered more demandingly this time.

"What? All I said was that as long as Mario is here to protect this world, the Koopa Kingdom will never flourish." King Bowser stated confusedly. "Why? What's up?", Kammy didn't answer her master at first. She just had this solemn look on her face, as if she was deep in thought.

"Your evilness... how far would you go to be rid of Mario once and for all, and to bring the Koopa Kingdom back up from the grimy depths of the mud?", Kammy had asked seriously. Her eyes were not set on her master.

"Uhhhh... pretty far I guess. Hey, what's this all about?", the king asked suspiciously. Kammy Koopa had ignored Bowser's question completely.

"Would you really?", She asked even more seriously this time, "Would you risk losing everything you have? Would you even risk never seeing the faces of the ones that you hold dear again? Your children? Me? Even Princess Peach?" Hearing all of this shocked Bowser very much! He just couldn't help but think.

'What is going on here? Just what is Kammy getting at? It would be sweet to finally be rid of that meddling plumber, Mario! But, would I really risk losing everything for the Koopa Kingdom? Even the ones I hold dear? Well, the kids could buzz off for all I care, but the princess? My dear, sweet Peach? I could never leave her. I would never leave her. But then again... it would be for the good of the kingdom, it would be for the good my troops, it would be for the good of my honor, but most importantly, it would be for the lack of Mario!' Bowser shut his eyes, grew a very sad, but cold, face on him, and then answered his magical assistant in a low, serious voice, "Yes. Yes I would. I am the king of this land, and for once, I must look out for what is best for it. Also, I loath the Mario Brothers. I seriously do! And if there is a way for me... for us... to never see their faces again...", Bowser then opened his eyes, and grew an angry, but hopeful expression on his face, "... then I'll do whatever it takes!!!", After saying this, the koopa king then let out a triumphed roar! Kammy Koopa was now able to look at her king. Never in her years of servitude had she ever heard King Bowser sound so serious about this matter before. He even went as far as passing up Princess Peach, his one true love! After she let out one long sigh, see managed to speak.

"Alright then, I'm convinced.", she quietly said to her king. Slowly, Kammy took her left hand, and put it into the sleeve of her right hand. Bowser soon realized that she was reaching for something up her sleeve. When she found what she was looking for, she pulled it out from her sleeve. After studying it from his distance, Bowser noticed that what Kammy had was a key. It was an old key that was black with some rust on it. On the handle of the key, there was the imprint of a small silver heart. Kammy glanced over to one of the able bodied Koopa Troopas and motioned one over to her with her finger. The Koopa slowly walked toward Kammy with a nervous look on his face. With extreme care, Kammy gently placed the small key into the Koopa's palm. She then cleared her throat.

"Take this key down to the vault found beneath the catacombs of this castle. Bring the you-know-what up here, to your king, post haste! I think it's about time he learned about it's secret.", she instructed. The Koopa's facial expression grew from nervous to serious. He knew what Kammy was talking about. The Koopa Troopa nodded, and marched out of the room, and down the corridor. Bowser, at this point, was so confused, it wasn't even funny. The king began to grow frustrated with Kammy Koopa; he couldn't take it much longer! His anger began to rise again.

"Now wait just a minute Kammy! I'm getting tired of you leaving me in the dark about all this! I demand that you tell me what is going on, and that you tell me NOW!", the king roared out. Kammy couldn't help but sigh again.

"I had a feeling this day would come. Ever since you started pursuing Princess Peach and the Mario Brothers, I knew it wouldn't be long before it came to THIS. Sir... have you ever heard of the Heart Crystals before?", the old magikoopa asked. Bowser thought deeply about this.

"Hmmm... Heart Crystals... Heart Crystals...nope, I can't say that I have.", Bowser responded

"That's okay, I didn't think you would have", Kammy continued, "In this world, there are several mystical gems known as Heart Crystals. Actually, there are seven to be exact. Anyway, these seven Heart Crystals were once the ultimate source of power years ago. They could be used to gain unbelievable power, attract or repel themselves or other forms of mystical energy, or most importantly, travel through space and times, to other worlds unlike ours! Unfortunately, centuries ago, something catastrophic almost happened, that almost meant the end to our world, and another neighboring world. Apparently, the Heart Crystals seemed to be the main route of the problem. After the problem was fixed, they were considered too dangerous to ever to be together again. So, to prevent another tragedy like that, the seven Heart Crystals were split up, and one each was given to seven trustworthy kingdoms, to guard in their castles, in hopes that they would never fall into the wrong hands. Your great-great-great-great grandfather was given one of the Heart Crystals to guard when he was king, back when the Koopa Kingdom was still a peaceful and friendly kingdom. Unlike you, your ancestor was a kind and trustworthy king. On his death bed, he gave and entrusted his loyal assistant, whom was my great-great-great grandfather, with the key to the Heart Crystal, and requested that the key be passed down through my ancestor's bloodline, and not to tell the future kings of the Koopa Kingdom about the existence of the Heart Crystal, unless of an emergency, for he feared that one of you would one day betray the other kingdoms, and want to use it's power to do unthinkable things. For years, things were quiet, and then you came into power, and then...", Kammy trailed off.

"Yeah, and then I betrayed the other kingdoms, and tried to overthrow them with my troops.", King Bowser said, finishing Kammy's sentence.

"Yes, well, that key has been given to my great-great-great grandfather, my great-great grandmother, my great grandmother, my grandfather, even my father Kamek. I don't know if Kammy's and Kamek's blood connection is real, but would explain why Kamek was only Bowser's assistant during his younger years, and not his adult years, and where Kammy came from. And now, the key is in my possession.", Kammy continued, "Since our kingdom is in danger of collapsing by Mario, I feel that this stands as an emergency! Sir, you might lose Peach, and everyone else here, but if we are ever going to survive from Mario and his brother, we're going to have to give up on the Mushroom World, and rebuild somewhere else!" Bowser was starting to understand Kammy Koopa's idea.

"So... what your saying is that we need this Heart Crystal thingy to escape to another world, so we can be rid of Mario for good, and rule the Koopa Kingdom without trouble of conquering the world?", Bowser asked. The Koopa Troopa, at that moment, walked back into the thrown room with the Heart Crystal. It was a medium sized, heart shaped, grey crystal, resting on a red pillow with yellow frills. It was also under a glass case for extra protection. King Bowser removed the glass case, picked up the Heart Crystal in his hand, and thanked his minion.

"Well... your partially correct.", Kammy had stated, "You see, to rip open the space time continuum and travel to a different world, a lot of mystical energy is needed. Only one Heart Crystal will hardly get you anywhere. You should collect all seven, but in order to travel, you would most likely need one more crystal." Bowser kept his eyes on the crystal he was holding.

"I see." Bowser said. After one more pause of silence, Bowser asked, " Do you have any idea which castles are holding the other Heart Crystals?"

"Actually", Kammy replied with a toying tone of voice, " I do happen to know that when the seven crystals were separated, one of them was given to the Mushroom Kingdom to guard." The sound of this filled the king with both anger and determination, mostly determination. But, would Bowser really risk breaking into Peach's castle twice in two days?

"I'll do it.", Bowser passionately replied "I'll get the Heart Crystals and travel to a distant world. I don't care what it takes, and besides with the Mario Brothers out of the way, nothing will stop me from conquering the world! I suppose it doesn't matter what world I conquer, as long as I conquer it." King Bowser proclaimed. He then pointed at one of his Hammer Bros., developed some more emotion in his voice and commanded, "You there! Go report to all of my remaining able bodied troops. Tell them that we attack the Mushroom Kingdom at dawn!"

"Uhhhhh, sir", the Hammer Bro. said, "It IS dawn."

"Oh, really?!" Bowser embarrassedly realized, "Well then, tell them that we attack the Mushroom Kingdom NOW!!!"


So, what do you think of the story so far? I know that a Mario/Sonic crossover is not the most original idea for a story here on FanFic, but what the heck? I seriously want to apologize for such a long chapter, but it takes a while to fully explain the story. In case you were wondering, NO, the story isn't going to fully revolve around Dr. Eggman and Bowser. This chapter was so you could understand the antagonists' motivations before the adventure really began. On that note, I have no idea when the next chapter will be out. It could be a few weeks, or a month, I don't really know! Anyway, please leave reviews, tell me what you honestly think of the story, and thank you for reading!