AN: One thing I did forget to mention, time is relative between dimensions of the multiverse, so the two and a half years was time that passed in the Buffyverse, and Xander will have spent a whole lot more actual time on his trip than had passed in his trip home.

Also, at this point, I have given Xander an advantage, namely the two spirits he was possessed by (Hyena and Soldier) have left a little bit of themselves within him, they opened up most, if not all, of his mind for him to use when he went through the portal, and they generate Ki that he can use just as easily as what he can naturally produce. While he isn't at the level of the super warriors of the Dragonball universe, he generates power much faster than most of them and learns faster than most of them. But he does get one heck of an attack in this, and he'll end up learning other attacks because the one he uses is a bit in the overkill department.

SuperFreak: At least a few stops are Anime, but I don't think they all will

Harry2: Yeah, that's where this starts off in breaking out of the official universe. Dragonball GT is currently on Cartoon Network, Trigun is on it's adult swim stuff on monday through wednesday at one AM where I live. But if you're talking about the crossover that starts with Tenchi Muyo at that site, I think I found it after you mentioned the idea. It was interesting to say the least.

Agent-G: His wish is more of to be able to defend his world like Goku and friends, and so he'll get something slightly off of what he expected.

TTrunks: Xander was briefly possessed by a Soldier during season 2's Halloween excapade with becomming their costumes. I figure that if he could still make bombs by the end of the third season, a rifle isn't that difficult to remember. Also, the reason for his weapon is because it has a lot more stopping power, namely as, although it isn't mentioned in the story itself, is a "Light 50" and you'll get the others reactions when I make it back to that point, though I may have an interlude between each saga.

xXx

The darkness was fading slowly around him and his head was throbbing like crazy.

"Where...where am I?" he muttered to himself as he started sitting up.

"What's this?" he heard a strange voice say from behind him.

Xander glanced behind him and nearly jumped out of his skin at the blue skinned creature.

"Ah!" he yelped as he frantically tried to reload his rifle, "Demon!"

"Demon?" the being yelped looking around frantically, "Where?"

"Your not a demon?"

"Lord no," the being said, "I'm King Kai."

xXx

It took a while for King Kai to figure out just how in the hell his visitor had ended up there, but he did end up giving Xander some training, well, after a fashion.

"Come back here you overgrown monkey!"

King Kai dove for cover as a barrage of ki enhanced gunfire shredded a path through his lawn, and he hoped that teaching the kid that trick wouldn't end up destroying his home. The kid was something else, learning tricks faster than he'd ever seen from anyone save Goku. The weapons trick was to try to explain that bullets are useless, but he managed to pull something completely off the wall out of his hat.

Then he scored a near hit on the ape he was chasing and nabbed him out of the air with a grim ease, it had taken him two weeks to get to the level he was at and his learning curve was rapidly increasing.

xXx

A month had passed and the Kai's cricket was still recovering from how he was "hit" and Xander was wearing clothes far heavier than the blue skinned alien had thought was possible for a human to sustain and was still moving freely with nearly two tons of weighted clothes.

The being was still trying to come up with how it was possible, he was definitely human, but his aura was strange.

That's when it hit the blue one, the aura looked like two beings merged into one, or at least the spirit of one was added to that of the teen, possibly more than one spirit added to him, each one adding to his raw power and abilities, his mind had added that extra as well, unlocking every part of his mind to be used as needed and far faster, the extra power was like super cooling a computer that was running at it's limit, and that limit was rising exponentially with use.

Xander was air born at the time focusing on everything he'd learned. He was hovering in a relaxed pose, his head bowed and he seemed to almost be standing, though his arms and legs dangled freely, his aura was a maelstrom of colors around him as he tried to clear his thoughts.

King Kai suddenly felt something that drew his full attention to the situation Earth's defenders had gotten themselves into. He hadn't informed his new student about it, yet, but he'd have to soon.

Little did he know that his trainee was also paying attention to the situation by watching through King Kai's link to that world. He was also thinking of how to face that monster.

He descended into a crouch besides his teacher and smiled slightly, "I know some of what's going on."

"What!" the blue skinned one yelped as he realized that he'd been spied upon.

"Yes, and I think I may have an idea on how to deal with this one," the dark haired one said with a calm expression, "That is if you can get me there and to someone who would be willing to help and has access to a well equipped lab."

"You're not fully trained," the alien yelled at him, "You're not ready yet!"

"People are dying," Xander responded with a cold chill, "I can't just stand around and let them fall, it's just who I am, besides, the instant transmission technique your older student knows should be effective in getting me back here."

"What's you plan?"

"I just remembered something I learned from a show I used to watch," the dark haired one said with a smirk, "Do you know anything about anti-matter?"

King Kai suddenly had the feeling that he'd accidentally created a monster, "Go, you may be able to use that kind of overkill to stop just about anything."

The other just smirked.

xXx

-A half hour later-

Xander frowned, he'd only managed to have one bullet made before he had to get to those he'd be aiding in battle. The woman, Bulma, said she'd make him a few more when the fight was over, and he had it stored in a special case on his belt.

The Z-fighters stared at the sky as a new presence made itself known.

Xander dropped through the clouds to hover an inch above the ground, "Hello Cell."

"Another to kill," the creature chuckled as the new fighter leveled his rifle, "Guns can't hurt me."

"We'll just see about that," Xander retorted.

"I'll even stand here and let you shoot me," the being bragged, "You get one free shot!"

Xander smirked as he loaded the special bullet, "One shot's all I need!"

He leveled the massive weapon, the only one he'd managed to salvage from the destruction that smashed him through dimensional barriers. Something that unbeknownst to him was that it had become something more in that trip, it was a focus bound to him, something that would amplify the power he channeled through it, be it magic or ki or anything else.

"Fire...water...earth...wind, elements of the earth I ask for your aid!" he whispered one of the spells he had learned, "Light and dark, elements of the mind I call upon you for help."

He closed his eyes, as he felt the power flow, "Heart, the element of the soul I pray for your blessing."

"May the power of the blessed be the might of destruction that ends this blight upon the lands!"

The spell completed as he began to use he technique for charging his shots as the enspelled bullet glowed pure white.

"Everyone," he yelled to those who he had come to help, "Run for it, as soon as I pull the trigger, I want you as far from here as you can get!"

"I'm not letting you sacrifice yourself for me," Vegeta snorted, "I can take the bastard!"

"Actually," the other responded, "It's because Bulma wasn't sure just how much collateral damage this would cause if I just used the ammo, I hope the bastard is as strong as King Kai thought or stronger because there may be a serious case of mass annihilation caused by this, definitely not enough to take out the planet, but a couple hundred miles, perhaps!"

"What the hell are you shooting at him?"

"A mix of ki, magic, and antimatter," the dark clad one shot back, "In other words, serious explosion coming right up!"

"Foolish," the monster laughed, having obviously missed Xander's explanation, "Nothing you can shoot at me can stop me! I am invincible, I have become a god!"

"Then this will give me the title of godslayer," the other retorted as he took aim and braced, "Supernova!"

Then the world seemed to disappear as the energy cascade from the weapon sent Xander flying backwards, the strike flashing towards the now stunned android abomination.

"No," Cell whispered as he brought his arms up to try to defend himself as he saw the raw power, "This cannot be!"

Then the being was ripped apart and the antimatter went off in a cataclysmic detonation that caused the human to jet away at full throttle as the blast lapped at his heels.

"Must go faster, must go faster!" he chanted to himself as he tried to do as he urged himself to do before glancing back, "Must go a whole lot faster!"

The last consumed him a second before he dumped even more power into his frantic flight, fear giving him a temporary boost as he burst from the destruction just before it collapsed into itself and vanished.

"Holy..." Krillin stammered.

"...Shit!" one of the others finished as the perfectly formed crater appeared from the devastation.

"Now I see what overkill is," Vegeta managed to say with a blink at the destruction that left no rubble, smoke, or other damage.