Hello, people! I've just decided to try out another crossover story, as that's the kind of story I think up a lot for the Teen Titans.

DISCLAIMER: I own neither Teen Titans nor Sonic the Hedgehog.

Chapter 1: Chaos Collision!

The day was going by smoothly, with no villain activity for once. Nothing new, no alien invasion, no robbery, no plot for world domination...nothing, really.

'Pretty boring.' BeastBoy thought, as he drank a soda he grabbed from the fridge. Cyborg and Robin were playing a video game, while Starfire sat next to Robin, watching them play, but casting sidelong glances at Robin every few seconds. Raven was reading a book at the table. BeastBoy knew that he shouldn't disturb her from those, so he didn't try. He just drank his soda in silence.

When BeastBoy suggested that they all go out to eat for dinner, there was a mutual agreement. It was at least something that they didn't do everyday, so it was something. So they all headed out to the pizza place they usually ate at.

Of course, the day would soon end with a surprise...

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The doors to the common room opened up with their usual hiss, and the Titans stepped in, Cyborg talking to BeastBoy.

"Look man, I know the day was slow, but you don't have to say that every five minutes!" he said roughly.

"It wasn't every five minutes!" BeastBoy said. He paused for a minute, then..."It was more like every seven..." he said meekly.

"Yeah, but still, if it's late like this, we usually don't have to worry about anything..." Cyborg began, but he got cut off.

Suddenly, there was a chaotically bright flash of light, hovering in the middle of the common room, looking like a huge, colorful cloud. A dim figure could be barely seen forming in the light.

"Me and my big mouth!" yelled Cyborg, covering his eyes. The light twisted through the air some more, then, with a loud THUMP, deposited something onto the floor, and disappeared. The Titans hesitantly stepped forward to see what it was.

"It's a big hedgehog!" BeastBoy exclaimed.

"How do you know?" Cyborg asked.

"Hello! Transforming into animals! I would know, wouldn't I?" BeastBoy said.

The hedgehog was black, with red streaks through its spines on the back of its head, and a white puff of fur on its chest. It was almost human-like, enhanced by the fact that it was wearing some strange kind of shoes. It looked wounded, and was breathing kind of shallow. To the Titans' surprise, it opened its mouth and spoke.

"Maria...ARK...Sonic...chaos...Professor...promise..." he muttered in a deep voice. The Titans couldn't make anything out of what it was saying, but they were concerned.

"Let's get him to the recovery room." Robin said. Starfire stepped forward and picked him up gently, and they carried him down the hall.

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The hedgehog's breathing was steadier, and Raven had healed the wounds, so it looked like all he needed was some rest before he recovered from whatever had damaged him.

"I wonder who he is..." Raven said.

"So do I." Cyborg said.

"Let's let him rest for now." Robin said. "We can interrogate him once he wakes up." he said, turning around and out the door, and the Titans followed him, and the door hissed shut behind them. Nothing could be heard in the room besides the quiet breathing of the hedgehog. In a whisper, he muttered something else.

"Chaos...Emeralds..."

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

AUTHOR'S NOTE

Well, I guess that's a sort of cliffhanger. So, what kind of events will happen now that Shadow's here? You'll have to read the next chapter to find out!

Please, R&R! I need lots of them!