AN: I'm still working through some ideas for later on in the series, especially now that I've definitely decided on Dawn being Knuckles later on, mainly for when I use Glory eventually, although Dawn didn't have access to the Power Rings before the fight, Glory may be strong, but she isn't up to flying around at those speeds.
Yes, that does mean that he requires Power rings to transform, it takes a pair of them to force the changes between his human and hedgehog forms. He still doesn't really know how to go Super or Hyper.
TopQuark- Tanks, I'm trying!
Aleh- Thanks, I'm trying to keep Sonic's attitude right for this, he's something else that the Sunnydale residents haven't encountered much, I am still leaning towards the Comics and the series with the Freedom Fighters.
WBH21X- I'm going to get into that, I'm running on a possibility that it could be, they get some dreams from the possession but no active memories. Willow does though because her mind didn't change and is starting to suspect that Xander knows what's going on, Giles just met Sonic and Super Sonic but didn't know that Sonic was Xander. Buffy doesn't really remember the blue creature she saw, thinking that it was another of the kiddies. Xander isn't really talking about it as he hasn't really used it that much and is actively trying to keep it from getting well known due to him reading far too many comic books. Plus now with Angelus dusted he has another reason, unstable Buffy. But along with that, Xander only has a few memories of his time as Sonic, and is working on accessing the forms of Super and Hyper Sonic
"I'm telling you Giles, it was some sort of demon," Buffy repeated.
Xander fought back a grin as he realized that Buffy would try to take him out if she knew. He thanked his planning at having another few Power Rings in his pack as a just in case situation.
"Anyway," Xander interrupted, "If it was a demon, why would it take out the Judge, not to mention deadboy? I mean, both of them were trying to kill us and it didn't attack you?"
"Yes," Giles responded remembering his own experiences with Xander's other form, "If it is the same being as appeared on Halloween, he's saved you two times now."
"But then why did he kill Angel?" Buffy asked, a sadness passing into her eyes.
"He didn't," Xander commented his mind flashing back to the efforts taken to save Sonic when he had been roboticized, Sonic's friends had saved him, but at a risk he would have rather they hadn't taken, everyone turning to look at him, "He took out Angelus, Angel could have still been in there, but in my opinion, Angel would have wanted us to deal with Angelus before anything horrific could occur."
"How can you say that?" the blond snapped, eyes accusingly on Xander, "You didn't even show up on time?"
"Look, in my opinion, we didn't know how to get Angel back and he did say that he hated himself for what he had done before he got his soul, it means that he at least has his redemption now, he's not in hell for it."
Xander turned and started to leave, "Anyway, I've got some homework to do and a massive headache, I'll see you tomorrow."
"Xander," Willow yelled, "I'll go with you, if you're not feeling well, I'll make sure you get there alright."
"You don't have to Wills," Xander said, starting to regret his excuse.
"You're my friend, it's my job to make sure that you're okay," she snapped back as Xander looked to Oz for help, who shook his head.
Finally, he shrugged and held the doors open as they walked out of the library.
They walked in silence, Willow trying to figure out how to start the conversation.
And then, everything went wrong, a large, lizard like Demon dropped down on them from the trees.
"Wills," Xander said as he unconsciously reached for a pair of Power Rings, another demon dropping behind them, "Run, I'll try to catch up, get help, but I've got to cause a distraction."
She nodded and bolted as Xander slipped two rings free of his bag.
The creatures circled him as he remained calm, focusing for an instant as a smile crossed his lips, "I'm waiting!"
Willow spun as she heard that, turning to watch a perfectly ready Xander clutching two, large, golden rings that seemed to cackle with inner light.
"I knew it," she hissed as a white light burst from her friend the instant the two lizard monsters lunged.
Xander smiled as he shifted into Sonic the Hedgehog as the light died down.
The two creatures slammed into each other, finding their prey missing.
Sonic landed from his leap atop a bench, "Ya know, if it wasn't enough that you were dumb and slow, you are sooo Ug-ly!"
He deftly evaded a bite by one of them, razor sharp teeth missing by a fraction of an inch.
Waving one white gloved hand in front of his face, "Phew, can I interest you in some breath mints?"
The other lunged, Sonic grabbing it by the crest on it's head and ending up in a handstand above the creature, "And talk about impulsive, anyway, why does this conversation seem to be so one sided?"
The first lunged, jaws closing on the others head as the blue streak leaped clear to land on his feet, snatching out yet another Power Ring as the bitten demon hit the ground, dead.
"Aw, ain't that to bad, tweedle dumb just got his head bitten off by tweedle dumber!"
The monster roared and charged.
Sonic seemed to materialize, skidding to a stop, behind it as it stumbled, having been tripped by a blue blur, "Watch our step, and well, it seems you aren't set on mute!"
Entering a spin dash, the hedgehog activated the power ring and blasted forwards, carving the creature up like a turkey.
He careened to a halt as his eyes caught a flash of movement and a blur of red.
Leaping up he groaned, "So the secrets out, huh?"
"Seems so Xander," Willow almost growled as he shifted back.
"Well, guess it wasn't the cravings for chilidogs that finally gave it away then," he commented.
The redhead just stared at that response, whatever she had expected, that wasn't the one.
"Hello?" Xander said, tapping on her forehead, "Anyone home? Earth to Wills?"
Eventually they reached Xander's, Willow still seemed floored
"Why?" she finally managed to say, "Why didn't you tell us? Why didn't you tell me?"
"What?" Xander answered, "Tell you I could change into a seven foot tall, blue, anthromorphic hedgehog? Heck, I can barely put my own mind around it, besides, it's a secret weapon, I don't use it unless I have to, or at least I didn't until the Judge when I had to access Sonic for it, and to stop those lizard creatures, it just wasn't something I wanted to risk, especially since Buffy and maybe you would have tried to get G-man to take that away, I couldn't be normal again, not after I learned what I could do."
Willow shook her head slowly, "That still doesn't explain what you did to Angel."
"I answered that in front of everyone, but another reason involves some of the nightmares I've had from Sonic," Xander said slowly pulling a few issues of the comics from a shoe box and handing them to her, "Remember these, I still get them, do you remember Mecha Sonic, I don't think that Angel would want to be responsible for killing off his friends, even if it was Angelus at the helm. My nightmares involve Mecha Sonic killing off Sally, Knuckles and all of his other friends."
"Oh Xander," Willow whispered, giving him a hug.