A/N: This is where the crossover really begins!

Through the Portal

After lunch, Bulma and her mother went shopping, Vegeta went back to the gravity room, and Trunks' grandfather went to go feed his fish.

The boys, mostly Trunks, had other plans.

"Hey, Goten," Trunks said, "I have an idea."

"Yeah, what is it?", Goten asked.

"Let's go check out the portal that my mom's building in her lab."

"Are you sure that's a good idea, Trunks?"

"Yeah, of course. I mean, what harm can a little peek do?"

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They soon found themselves in Bulma's lab.

"Trunks, what is that thing that looks like a TV?", Goten asked.

"Wow, Goten, you found it!", Trunks exclaimed, "That's the portal that my mom was building. It looks like she finished it. I know, let's test it for her."

"Are you sure that's a good idea?"

"It's not like we're going to get into trouble. At least, we'll be able to see if it works."

"O-Okay," Goten stammered as Trunks grabbed the remote for the portal.

"The green button must turn on the portal," Trunks mused as he pushed the button, opening the portal. Just as he pushed the button to turn on the portal, a whirlwind from it started to suck the boys in.

"Trunks! The portal-thingy grabbed me and is sucking me in!"

"I know! It grabbed me, too! And I can't shut it off!"

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Next thing the two demi-Saiyans knew, they were landing on concrete in the middle of an alley at night.

"Well, well, well," a voice taunted, "what do we have here? A couple of kids who don't know what they're in for."

"Whoa, Trunks," Goten asked, waking up and rubbing his head, "Where are we?"

"I don't know," Trunks answered groggily, "but they're in for a lot of trouble, Heh-heh!"

"Who?," Goten asked. He then realized what Trunks was talking about, "Aaagh!"

Trunks kicked one of the muggers all the way to the other side the street. Goten having gotten over his grogginess, landed another on top of a car. They were just about to take out the third one when they heard sounds of a scuffle further down the alleyway.

"Goten, let's go help those people," Trunks said as he took out the last of the gang.

"OK," Goten answered as they took off towards the sounds of the fighting. When they arrived, they found four turtles using ninja weapons to take out some guys dressed as ninjas.

"Cool," Trunks remarked, "Hey, Goten wanna help these guys out?"

"Sure," Goten answered as they flew to the back and started to take on some of the bad guys themselves. Goten kicked one into a building this time, while Trunks landed one in an alley across the street.

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"Hey, check it out," Mikey said, "looks like we got a little help."

"Yeah," Raphael grunted as he punched a FootBot in the face, "Who?"

"I don't know," Donnie remarked, "But they sure look strong for a couple of little kids."

"I wonder where they learned to fight like that," Leonardo said before slicing the arm off of another Bot.

"I dunno, but they sure are good," Raph said using his sai to toss a Bot into a nearby dumpster, "That's all she wrote."

"Hey, I don't know who you are, but thanks," Mikey told the two boys.

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"Hey, I know Goten," Trunks suggested, "let's go over and see who we helped out."

"Okay," Goten said, running over and seeing who the mysterious strangers were.

"What are you kids doing out here?", the turtle in the red mask asked, "Don't you know that it's dangerous?"

"Yeah," Trunks answered, "but if you hadn't noticed, we took out some bad guys before we arrived to help you guys out. And we actually had nothing else to do and no where else to go."

"Hey, Trunks, I'm hungry," Goten said as his stomach growled.

"Oh, yeah," Trunks told them, "and we don't have any food."

"Can we keep them?", the turtle in the orange mask asked, "Can we, can we, can we?"

"I highly doubt that Master Splinter is going to let us bring them home," the one in the blue mask answered, "let alone keep them, Mikey."

"Awww…," Mikey pleaded, using his puppy-dog eyes. "Please, Leo."

"Fine," Leo relented, "If you two will tell us your names and where you came from, you can come with us."

"My name's Trunks Briefs, and he's Son Goten," Trunks said as he introduced himself and Goten, "We came from a different version of Earth through my mom's portal that she built."

"So, there are alternate dimensions out there," the purple-masked turtle said, "My name's Donatello, by the way."

"Of course," Trunks told him, "so what are the other turtles' names?"

"The one in red is Raphael, the one in blue is Leonardo, and the one in orange is Michelangelo."

"How did you learn to fight like that?," Leonardo asked.

"Our dads taught us," Trunks answered, "And there's more tricks where those come from."

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They soon came to a dead-end alley.

"Down we go," said Michelangelo, as he grabbed the manhole cover in front of them and climbed down the ladder.

"Heh-heh," Trunks told them, floating down the manhole, "we don't need ladders."

"Whoa," Michelangelo remarked, "That was cool. Can you show me how to do that?"

"Sure, but it could take a while and a whole lot of energy for you to learn," Trunks told him flying with Goten along side the rest of the group.

"A lot more than you think," Raphael commented snidely.

"Hey," Mikey told him, "I can learn just as well as you can."

"Sure, you can. Then how come you always lose to me when we spar?"

"Can it, you two," Leonardo told them.

"So," Michelangelo asked Trunks, "Do you have any nicknames? You know like Leonardo is Leo, Raphael is Raph, Donatello is Donnie, and they call me Mikey."

"No, not really. But when we fuse they call us Gotenks."

"Whoa, you two can fuse in to one person," Donnie said, "But I didn't think that was scientifically possible."

"Oh, yeah. And so can our dads. When they fuse they become either Vegito or Gogeta."

"Here we are," Mikey announced as they entered the lair, "Home sweet home."

A/N: Ran it a little long, but it was worth it.