(Hey, all! Heartless Nobody/Zero-Cross here, with a new fic inspired by this odd little dream I had, involving Riku lost in the world of SatAM and caught in the middle of the war between the Freedom Fighters and Robotnik. This is possibly the very first crossover ever, between SatAM Sonic the Hedgehog, and Kingdom Hearts. I don't own KH or SatAM; the former's own by Square Enix and Disney, while the latter's owned by DIC.)

CHAPTER 1

Peace and quiet; something that once seemed all too familiar and boring for Destiny Islands was now a welcome and cherished thing for this world. With this world and its inhabitant's safe, sound, and secured, with hearts in tact, peace and quiet would win over excitement any day; especially if excitement meant utter chaos. Utter chaos was what was brought to Destiny Islands with the arrival of the Heartless. Both this world and its people had lost their hearts to the darkness; doomed to spend an eternity in oblivion. But hope shined for this doomed world, in the form of the legendary weapon known as the Keyblade. Its bearer, Sora, had saved this world as well as the whole universe from the brink of destruction; but he wasn't on his own, as he had friends across the universe on his side. Now with the universe safe from the Heartless, all worlds could rest easy at night, knowing that they were safe from harm.

Riku never thought he'd actually enjoy peace and quiet in his life. He was always the one who wanted to branch out and explore; always curious if there were any other worlds out there aside from his own. The adventures just seemed to play over in his mind over and over; from the first adventure where he had allowed himself to be corrupted by the darkness within, to his path of redemption, and finally to his acceptance of the darkness and fighting by Sora's side to protect Kingdom Hearts. But now, tranquility seemed to suit him just fine as he slept peacefully in bed; something he hadn't done in a long time.

RIKU… A soft genderless voice echoed through the air like a breeze.

Riku yawned and opened his eyes slightly, wondering what he had just heard. Shrugging it off as just a dream, he laid back in his pillow and drifted back to sleep.

RIKU, the voice whispered again.

Riku's eyes shot open slightly. "Somebody called me?" He wondered aloud and looked about his room a little. "Huh…it must be my imagination." He lay himself back down and shut his eyes.

RIKU! The whispering became louder.

Riku sat up in bed, now knowing full well the voice wasn't a dream. "Who's there?" He shouted as he took a better look around the room, seeing nothing but the darkness brought about by the night, along with the soft faint silhouettes of objects in his room.

RIKU, the voice whispered like the wind, COME…COME TO THE BEACH…

Riku gripped his sheets warily and narrowed his eyes in suspicion, "Is that you Ansem!?" He shouted, thinking Ansem/Xehanort's Heartless had somehow resurfaced and was trying to take control of him again.

…COME…TO THE BEACH…ALL WILL BE SHOWN TO YOU… The voice kept echoing out like a gentle breeze.

Riku's suspicion turned into confusion now, as he threw off his bed sheets and swung his feet over the side of the bed. If it were Ansem/Xehanort's Heartless, would the voice have sounded so coaxing and gentle? "…Who are you?" He asked.

COME…JUST COME…

Knowing that this voice was just not going to let him be, Riku quickly slipped on his black shirt, blue jeans and white jacket, before tiptoeing downstairs from his room. He quietly walked down, step by step, careful as to not make the stairs creak too loudly, for fear of waking up his family, or as to miss a step and tumble down the stairs. When he finally reached the bottom, he reached into his right jean pocket and pulled out his house keys; inserting them into the lock on the door knob and turning the knob slowly. He walked out of the door and closed it behind him, loosening up now that he was outside with no problem. He quickly ran to the direction of the docks, to get a boat to cross to the islands with.

RIKU…RIKU…COME RIKU…

The voice echoed and whistled all around Riku as he paddled his rowboat towards the islands where he played with Sora and Kairi. He was more determined then ever to uncover just WHO was calling his name and what he/she/it wanted. As Riku pushed the hours through the dark ocean waters, he looked over his shoulder and saw the island getting closer. He pushed and rowed harder, as the voice coaxed him further, until he heard and felt a loud "BAM!" and fell onto his back on the floor of the rowboat.

Groaning a little, Riku picked himself up out of the boat and looked at his surroundings, finding himself upon the shore of the island; but the mysterious whisper had suddenly stopped the moment he had reached the island. Stepping out of the rowboat and onto the sandy beaches, the young man flicked his shoulder length shiver hair back as he looked around the beach, for any sign of the being who had been calling him. "Hello?" He called, "Are you still here? I've come to the beach just like you wanted me to! Now what?" Riku waited, but no answer seemed to come. "Hello?" Riku called again, but still no voice. "I don't believe this…" he growled, "Whoever's out there calls me and calls me, chanting my name, but when I finally do show up they decide to keep quiet."

RIKU! The whisper shouted out once more, carrying across the air of the island.

Riku started looking all about the island for ANY sign of someone other than himself on the island. "Alright, enough! Either tell me why I'm out here, or I'm going back home!" He yelled, getting a little fed up with this nagging mysterious voice. Before he could say or do another thing however, an immense portal of black energy suddenly opened up right underneath Riku's feet and began to absorb him like a sponge that absorbs water. Riku cried out and tried to run, but he felt like he was sinking in a patch of quicksand or slurry. "AGH! What's going on!? Am I being sent back to the world of darkness again!? Sora! Kairi! Tidus! Anybody! Help me!" Riku was now stuck in the mass of black energy up to his waist, and quickly sinking up to his neck. Crying out one more time as his head sunk into the mass of darkness, Riku raised a helpless desperate hand, reaching out for anyone; but nobody came as Riku's hand sunk back into the pit of darkness and everything went black. Riku could not see anything, hear anything, or even feel anything as he was absorbed into absolute darkness.

BEEP! BEEP! BEEP!

"Hmmm, what's going on here?" A short balding needle nosed man asked out loud as he gazed at the computer radar in front of him. Up in the high right hand corner of the radar, a strange red blip started flashing on the screen, indicating the presence of a foreign life form. "Computer! Analyze life form and screen a close up as soon as possible!" The man ordered in a nasally voice.

ACKNOWLEDGED, the monotone voice of the computer bellowed out as it began its work.

"Snively!" A deep booming voice barked out.

Snively jumped a bit, sweating nervously, as he turned around to see the source of the bellowing voice. A large man walked into the room with a malevolent air about him. His gargantuan body was about 6 feet in length and 5 feet in width, making him a very LARGE man in deed. His blubbery body was dressed up in a large spandex outfit; red on the top, black on the bottom, with grey leggings along with a pair of red and grey spandex boots on his feet. His large oval head came up to a point on top and his malicious looking face bore a bushy orange moustache. The deep red pupils of his black eyes studied Snively for a moment before gazing at the radar. "Snively what ARE you doing?" The man demanded.

"Robotnik, sir," Snively addressed the man a little nervously; "We have a foreign life form in the vicinity of Robotropolis. I was just receiving a close up image of him from the security cameras."

"A foreign life form, you say?" Robotnik questioned seriously, intrigued, but also a little annoyed, "Is it that blasted hedgehog, the princess, or one of those other miserable fur balls?"

The close-up image popped up on one of the other screens, showing the image of the target on the radar; however the life form was no animal. In the corner of a dark alleyway, surrounded by random piles of scrap metal and machine parts, a young teenage boy of 16 years lay sprawled out on the ground, unconscious; he had shoulder length silver hair, gentle yet serious features on his face, and was dressed in an outfit that consisted of blue jeans with a white belt, black and white sneakers, a black t-shirt with a zipper in the middle, and a short white jacket.

"Well what's this?" Robotnik asked aloud with surprise, "It's not one of the freedom fighters at all… It appears to be another human being, much like ourselves."

"Dr Robotnik, sir," Snively interrupted as he sat in front of another computer, reading some odd readings from the radar, "the human boy seems to be giving off some strange energy readings, quite unlike the power signatures from the power stones. The power he seems to be radiating is not from this world; neither light nor darkness."

"Really? Not of this world power you say?" Robotnik's interest was caught, "interesting…" He rubbed his chin in thought, "Snively, make sure to keep an eye on that boy. Don't let him out of your sight until I can have a personal meeting with him."

"Of course, sir," Snively replied, "I'll send the Swatbots to subdue him."

"Make sure they do ONLY that," Robotnik ordered, putting his face in front of Snively, with a warning look, NOT wanting to repeat himself, "Do you understand? I want that boy, ALIVE."

"Y-Yes, s-sir…" Snively stammered nervously as Robotnik took his face out of his own. 'Fat stupid idiot, I was well aware that you wanted him alive,' he thought irritably.

Meanwhile, Riku began to come to his senses, moaning and stirring as he slowly opened his eyes. When his fuzzy vision finally cleared, he was met with the image of a dark, smoky looking sky, with smokestacks and giant metallic looking buildings reaching up to the murky clouds of smoke. "Ugh, my head…" Riku groaned as he sat up, "Where am I?" He looked around the alleyway, seeing nothing but machine parts and scrap metal around him, "Looks like I'm not on Destiny Islands anymore. Where the hell did that warp hole take me too?" He stood on his two feet and walked out of the alleyway, onto the streets. Before Riku, there stood an immense city of iron and steel. Giant towers of metal reached up into the sky, robots marched and floated about the dirt streets, machines whirred and hummed nearby the buildings, and more metal pieces and machine parts littered and piled the streets. "Well," Riku said to himself as he gazed about his surroundings, "this place is definitely too hi-tech and industrial looking to be the World That Never Was. What IS this place, anyway?"

PYOU! PYOU! PYOU!

Riku quickly dodge rolled out of the way as a barrage of laser shots rained down on where he once stood. When he looked back up, he found himself surrounded by a platoon of black humanoid robots with dome shaped heads, each one pointing a rifle directly at him.

WARNING! WARNING! CEASE MOVEMENT AT ONCE INTRUDER, OR BE TERMINATED! The lead robot demanded.

Riku studied the robots carefully, look at them from top to bottom intensively. "No symbol…" he said to himself, "so these things are neither Heartless nor Nobody." He slowly stood up straight.

CEASE MOVEMENT AND STAND DOWN! THIS IS YOUR LAST WARNING! The lead robot cocked his gun and pointed it threateningly at Riku.

Riku snorted and smirked. "Threatening ME, are you?" He held out his right hand to the side where light and dark energy streams materialized out of thin air and began to mold and twist into an odd key/sword shape. When the energy dissipated, Riku's Way to the Dawn Keyblade appeared in his hand; a bat winged shaped Keyblade with angel wing handles, an angel wing "tooth," and a Heartless symbol keychain. Taking the weapon in his right hand, raising it to the same height as his head, sticking his elbow out and pointing the tip of the Keyblade towards his enemies, Riku stood ready to fight. "Now which one of you rust buckets wants to go first?"

INTRUDER IS RESISTING! The lead robot bellowed. ALL SWATBOTS COMMENCE ATTACK! All of the SWATbots stood and opened fire.

"DARK AURA!" Riku held out a hand and a shield of energy, looking like a small wall of glowing octagons, generated in front of him and deflected all of the laser shots fire upon him.

ERROR! ERROR! WEAPON FIRE HAS NO EFFECT! The lead SWATbot warned the others.

"No shit, dome head," Riku said with a dangerous smile as he brandished his Keyblade, "now it's MY turn." He lifted into the air, as the robots pointed their guns at him, threatening to shoot again. "DARK AURA!" Riku shot towards the SWATbots like a bullet and his Keyblade cleaved right through the lead SWATbot's metal armor like a hot knife through butter, slicing through circuits and wires and severing parts and segments of the robot, before Riku changed direction instantly and cleaved through another SWATbot. Riku slashed through eight SWATbots at the speed of light, confusing the robots greatly, before landing and stabbing the ground, sending out black flames and incinerating another five SWATbots.

HALT! CEASE YOUR ATTACK! Another group of SWATbots began to advance on Riku, firing at him repeatedly.

With another Dark Aura, Riku blocked the laser shots, before charging up a mass of black flames in his hand and firing a medium sized fire ball directly at the robots, causing a small explosion and sending a shower of parts everywhere. Six more SWATbots ran out to grab Riku, but he struck first and landed a flurry of blows against their metallic hides before giving a quick spin attack, knocking them away from him and into the walls, shattering some of them.

Robotnik watched Riku intensely, as the boy fought valiantly against his SWATbots, his eyes full of amazement as the grin on his face grew wider. "Oh yes… Oh yes! Snively, do you see what I see?"

"It's amazing sir!" Snively said as he read the collected data from the computer fax, "Whoever this boy is, these power readings he and that strange sword are releasing are completely unheard of! It might even be enough to rival Sonic's speed!"

"Exactly what I was thinking Snively," Robotnik said softly as he stared at the image of Riku, "This boy and his strange power are exactly what I need to finally stomp out those accused rodents! Especially that hedgehog! Oh yes," the fat dictator rubbed his hands gleefully as he watched Riku swing down from the air and cleave the last SWATbot in half, "this boy could very well be our new secret weapon."

TO BE CONTINUED