Me: People are lucky. I had to let CasM (Chrissy…or however she spells it ^_^) reveal the other fandom in her review. I didn't make it that hard to guess! Even typing Apotos into Google would have revealed the other fandom, as she found out after guessing the right answer. *sigh* Onwards I say.

Brightshadow: I think you forgot something last chapter.

Me: Oh? Don't you mean that YOU forgot something last chapter? Don't do it until the end though, you'll give it away.

Brightshadow: Fine. Get on with it woman!

Me:…..

Brightshadow: Uh…bye! *runs off with Idalia hot in pursuit, warhammer raised*

Leonardo looked on with both amusement and confusion as the creature continued banging its head against the wall of the alleyway. Suddenly it stopped and turned its head to where Leonardo's brothers sat slumped against the wall on the other side. As they watched, Donatello's eyes fluttered open and fixed on Leonardo. They widened when they took in the creature standing beside Leonardo, but he showed no other indications of surprise or alarm. Donatello slowly got up and moved towards Leonardo, watching the creature warily, who turned to face them.

"Look, I'm sorry about attacking you guys, I honestly thought you were with those Kraang things. They look a lot like the kind of thing my arch enemy would use, and I have seen sapients working for him before. My name's…"

The creature paused mid-sentence to turn quickly, grab Raphael mid-strike and spin to flip him over onto his shell. He spoke, the snarl evident in his voice.

"Try it again, I dare you. I'll take any chance you give me to kick your butt."

The creature frowned and spoke a bit softer this time.

"You know, you remind me of a knucklehead I know."

Raphael looked between his brothers and the creature, a confused look on his face.

"I missed something, didn't I?"

The creature laughed quietly and shook his head.

"As I was saying to your brothers before you decided to try to take me by surprise, my name's Sonic." (AN: It is revealed!)

"I'm Leonardo, this is Donatello, Raphael, and that," he paused and motioned towards their still unconscious brother "is Michelangelo. Might want to watch your back near him, he takes any chance he can get to prank someone."

At hearing this, Sonic grinned, and if you have ever seen Sonic the Werehog grin, it looks more like an 'I will eat you now' grin.

"Interested in some payback? I have a pretty good idea to scare the crap out of him."

The three conscious turtles grinned and Raphael answered.

"Definitely. What did you have in mind?"

A few minutes later Leonardo, Donatello and Raphael were sitting on the edge of the roof. Down below in the alley, Sonic was pacing in front of Michelangelo. Down on all fours, he would occasionally look up at the three on the roof before focusing his attention back on Michelangelo. It was at one such time that he froze and turned back to look at Michelangelo meeting his eyes. Growling, he paced forwards slowly as Michelangelo struggled to get up. Most likely thinking he could outrun him, Michelangelo dashed for a manhole in the street. He froze when Sonic dashed past him on all fours and stood in the mouth of the alley, silhouetted menacingly by the light of a nearby flickering streetlamp. Eyes locked, Sonic and Michelangelo stood mere feet from each other, one unwilling to take his eyes off the other. Michelangelo screamed and whipped around when someone grabbed his shoulder…only to come face to face with his brothers. Raphael and Donatello were laughing like crazy, leaning on each other for support and Leonardo seemed to be struggling to keep a grin off his face. Michelangelo turned around again and yelped when he came face to face with Sonic's smirking face. Sonic stuck out his hand and Michelangelo tentatively took it and shook.

"Names Sonic. Sorry if I scared you, your brothers mentioned you were a prankster and I couldn't resist."

Sonic's aforementioned smirk seemed to suggest he wasn't sorry at all, but Michelangelo just smirked back. Trying to stay quiet, Michelangelo whispered to Sonic.

"We could be pretty good at pranking them, interested in a partnership?"

Sonic just smirked again.

"Sorry, but I work alone. You could always be my sidekick if you were that desperate to pull off a great prank though."

Behind them, Leonardo, Raphael and Donatello groaned.

"Great…..now we get to contend with the two of them trying to out prank the other."

Leonardo looked back towards the grinning Sonic and Michelangelo then looked at the sky. Heading towards the manhole in the road he turned back.

"It's nearly sunrise guys, let's get going. Master Splinter will have a fit if we're seen by humans again."

One after the other, they jumped down into the sewers. Looking at each other then back at the manhole, Donatello asked what they were all wondering.

"You think he's coming? I kind of doubt it, but he might have somewhere else he can go."

Leonardo shook his head and sighed.

"We can't wait around here forever, let's go."

Just as they turned to leave, a thump and splash behind them made them turn back. A very uncomfortable looking Sonic stood there, massive hand behind his head. Behind Leonardo, Michelangelo was grinning, happy that his newfound friend was coming with them. Nodding, Leonardo headed down the tunnel.

"So, uh…you guys live down here?"

"Kind of. We actually live in an old station that's down here."

"I see…so, I heard you mention a Master Splinter earlier. I take it you four aren't alone?"

"Master Splinter is the one who found and raised us, and taught us skills in the art of the ninja. What about you?"

"I…"

"Never mind, you can tell us later. I can see you're uncomfortable talking about it."

Sonic smiled gratefully.

"Thanks."

Looking up, Sonic stared at the open chamber before him. He smiled, knowing he could get used to this place, then frowned when he realized he'd have to get back to Mobius somehow. A door opened and Master Splinter came out to greet the Turtles and their guest.

"Who is this, my sons?"

Leonardo and his three brothers bowed, then answered.

"This is Sonic. We found him on the surface fighting some Kraang."

Raphael grinned wryly and added,

"He also though we were with them and promptly kicked our butts."

Master Splinter frowned and looked at the various positions of exhaustion the Turtles were in.

"We will talk more later, it is getting late. You all need rest. You are free to sleep on the couch Sonic."

"Thank you."

Half an hour later Sonic was making his way to the nearest manhole, and in seconds was lifting it and out in the early morning. As soon as the sunlight hit him, there was a flash of golden light and Sonic the Werehog was replaced by Sonic the Hedgehog. Smiling contently, Sonic made his way onto the nearest roof. There, he spent a few hours practicing with Chaos energy, made more difficult by the fact there were no Chaos Emeralds in this world for him to use. Surprisingly, there was plenty of ambient Chaos energy in the air though. He settled down for a nap in the shade of a nearby air conditioning unit on the other side of the roof. He was rudely awakened about half an hour before sunset by voices nearby.

"How many mutants are we going to encounter tomorrow then, if we've found two now today!"

"Calm down Mikey. We were taken by surprise by Sonic; it'll be the other way around with this mutant. I'm not going to let us get our butt handed to us twice in a row."

A pause.

"You better be right Leo."

Grinning inwardly to himself, Sonic decided to push their buttons a little. He twitched his right ear and the not-so-silent cussing from Raphael informed him that it had been noticed. He opened his eyes and got up into a defensive position. The Turtles watched and surrounded him with wary determination, but had no time to react as one by one, Leonardo, Raphael, Donatello and Michelangelo were hit hard and sent flying backwards by the curled up Sonic. Groaning, they quickly got back up and into a fighting position, only to look at each other with confusion and relax when they found Sonic leaning against the air conditioning unit he had been napping against. He looked both relaxed and amused, which annoyed the Turtles.

"And THAT my friends, is why you don't rush headlong into a fight without assessing the situation first. You've gotten your butts kicked twice in a row by me now!"

Leonardo stepped forward warily.

"This is the first time we've ever fought with you, we've never met you before in our lives."

Sonic's grin just got even wider, which seemed to annoy Raphael even more.

"Sonic the Hedgehog, at your service."

A shocked silence met his word as the four turtles stared at him. Sonic rolled his eyes.

"Don't all ask questions at once."

Donatello, being the scientist he was, couldn't help but start asking questions.

"Why did you look different when we met you earlier last night? How do you move so fast? How…"

"Jeez slow down with the questions. One at a time. Right then, why did I look different when you met me earlier last night? Ever heard of lycanthropy?"

"Yeah, anyone who's heard of werewolves has. It's the disease that turns them wolf-like. Everyone knows it's not real though, just a story to scare people."

"That's where you're wrong Donatello…eh…mind if I call you Donny?"

"Go ahead, it's what my brothers call me too."

"Okay. Anyways, you have living proof that lycanthropy is very possible…mine may be a special case though. I'll elaborate on it later. Right now you may want to back up, the sun's about to set, and usually I need a few seconds to gather my wits after the transformation. Feral instincts and all that."

Glancing at each other, the Turtles backed up, giving Sonic most of the rooftop. They froze though, and stared transfixed by the sight in front of them. Sonic's fur was starting to darken, turning a navy blue in most places. The tips of his quills, around his wrists and a spot on his stomach were lightening to white. At this point the fur started to lengthen, becoming the shaggy coat he had the night before. His gloves bulged as his arms and hands swelled with muscles and his nails sharpened to claws. They heard him whimper in pain as his ears changed to a crescent moon shape and his teeth lengthened and sharpened like those of a predator. Finally it was over. Giving him a few seconds, Leonardo went closer to the hunched over and panting Sonic, resting a hand on Sonic's back in between his quills.

"You okay?"

Sonic's response was a growl as he stood up to his full height.

"Fine. Just peachy!"

"Right…stupid question."

"Now that you've had your question, it's my turn. Where did Raphael go?"

Leonardo's eyes widened when he noticed said turtle missing. The four on the rooftop glanced around before freezing and glancing south, where they could hear angry shouting in the distance. Rolling his eyes Sonic started in that direction, followed by three annoyed turtles.

Me: Wow….longest chapter I've written for any of my stories yet. Also the first one I wrote on paper before typing it up. Yes, my crossover is TMNT and Sonic the Hedgehog. As far as I know, there's only 9 on this site if you include mine, and in my opinion…that's too low a number! Now….I've decided I'm going to try this for a bit and if it works out I'll do it all the time. Answering reviews!

Brightshadow: You are so childish sometimes.

Me: Don't you mean all the time?

Brightshadow:….you're right. ALL THE TIME. Now what was I doing? Oh yeah! Idalia doesn't own Sonic the Hedgehog or TMNT…but the plot is hers.

Me: Cyber cookie if anyone can guess who Raphael is arguing with!

Review Replies.

Crazymelody: Glad you like my story!