Well, as far as I know, this is the first Jimmy Neutron/DP crossover. Jimmy may not be completely in character, but I'll do the best I can.

Giramon: Good luck with the story. By the way, when are you going to continue with the other one?

Me: I have writer's block right now, but I should start soon.

15-year-old Jimmy Neutron got out of bed. He didn't get too much sleep, since he was working on a portal that can transport others to different worlds. Christmas Vacation gave him a lot of time to work on it.

At least I got about 4 hours, which was enough time to get REM sleep, which is what you really need. He thought.

He had grown over the past 2 years. He still had his acorn-shaped hair, but he was nearly 6 feet tall now, towering over his rival Cindy Vortex, who was only 5'5. He also had some muscles now, unlike when he was 10.

He got dressed quickly and got his homework on igneous rocks. He was ready to go to school when he heard a voice.

"James Neutron… James…" the voice moaned.

"Who are you?" he demanded. "Show yourself!"

He appeared as an old man with a stick. He looked like a prophet. He was green and was flying around the room.

"I come to you, James Neutron." said the old man.

"That much is obvious." he replied. "Why did you come here?"

"I came to bring you a warning, James." he said. "Call me Seer, for that is what I am."

"Okay, Seer, what's the message?"

"A great foe will soon challenge you, and your brain will not overcome it. An old enemy will arise, wanting vengeance."

"Than who is it?"

"To see him is beyond my powers, but know this: You and your friends will not beat him alone. In addition, you will have to fight an enemy similar to what you have faced before."

"You haven't given me any definite answers, only speaking in riddles. Who are you talking about?"

"I cannot give you that answer, for my powers are limited. All I know is that it threatens all life, not just Earth. In order to beat it, you must find the Halfa."

"What the heck is a "Halfa"? I've never even heard of it."

"You must find it, and it is in Retroville. You will need his help to succeed. In order to find out, set your machine to 44678-9663."

"And where will that lead?"

"That is for you to find out, young genius. And now I say farewell."

He disappeared as suddenly as he had come, leaving Jimmy with a lot of questions.

Who the heck was he? What is a Halfa? Is he even telling the truth? It could easily be a trap by one of my enemies.

Jimmy went outside and turned on his jetpack. Since his mind was on his mysterious encounter, he nearly hit buildings and people, which made many of the townspeople angry.

It didn't take him very long to reach Retroville high, which wasn't very different from the elementary school. He went down to the ground and his 2 friends, Carl and Sheen, greeted him.

"Guess what, Jimmy?" said Sheen. "I got a life-size Ultralord statue!"

Sheen Estavez was the same as always, obsessed with Ultralord and pining over Libby, Cindy's best friend. His appearance had changed little, other than the fact that he had grown taller.

"I got to go to the Llama convention!" Carl said excitedly. He was still overweight and wimpy as he had always been, but he had grown a little stronger. One thing that hadn't changed a bit was his Llama obsession.

"Good for you, Carl." said Jimmy. "I just hope you didn't forget about the report."

"Crud, that was due today?" said Sheen. "Why is the world so cruel?"

"How could you have not gotten it done?" asked Jimmy in amazement. "We had a week to do it, and I finished mine in ten minutes."

"Whoops, I… wrote about Llamas instead." said Carl. "I'm going to get another F."

"At least you don't have your mom scolding you about your grades all day!" exclaimed Sheen.

"Break it up, you two." said Jimmy before and argument could start. "Let's just get to class."

Jimmy's page was ringing, and sure enough, it was his partner and student, William Thornhill. He was 2 years older and an orphan, but was also very smart. Jimmy had started to teach him when he was 12 years old. (Jimmy, not Will)

"Good news, James!" he said. "The inter-dimensional portal is ready to go. All we need to do is put in the coordinates. I've triple checked for errors, and we're ready to go once you get home."

"Thanks, Will." he replied. "I got to go!"

Carl, Sheen, and Jimmy just barely made it to class. Their teacher, Mr. Hernandez, was less than pleased. They sat down in their seats, but before their class begun, he had an announcement.

"I'm pleased to announce that 2 new students will be joining us." he said, as the students in question glared at each other. "Tell us a little about yourselves, boys."

The boy was about 5'10 and had blue eyes and brown hair. He was skinny, but he was stronger than he looked.

The other was 6'2 and around 215 pounds. He was obviously strong, and built for football. He had brown hair and eyes.

"My name's Daniel Fenton, and I moved here about a week ago." said the smaller boy. "That's all I have to say."

"I'm Dash Baxter, and I look forward to hanging with the popular kids." said the larger one.

He took a seat next to Nick Dean, the most popular kid in school. Danny sat away from everybody else, his face completely emotionless.

"That Dash kid sounds like bad news." said Carl fearfully.

"You can't say that until you know him better." replied Jimmy. "We've only seen him for a few minutes."

"I guess you're right, Jimmy." replied Carl.

Class was mainly focused on Sedimentary rocks, with Jimmy giving a long boring speech about it. Cindy was very irritated and tried to outsmart him, but didn't have much of a chance.

Finally, it was lunch time, Carl's favorite time of the day. Jimmy was doing his homework and soon got it done. Sheen was blabbing on about Ultralord episode 134: return of Robofiend. Neither of them were paying much attention.

After lunch came their least favorite class: Gym. The 2 new students were in the same class. Carl hated it most of all, since he was the one often picked on by the football kids. (Not all of them, but most of the bullies)

"Well, time for another day of torture." said Jimmy.

"At least I have Ultralord to look forward to when I get home." said Sheen.

"Why are you so obsessed with that show?"

"Why don't you like it? It's the best! 450 episodes of nonstop Ultralord!"

"Calm down, Sheen." said Carl.

Meanwhile, Dash was talking with Nick, trying to gain acceptance into his group.

"Of course I'm willing to it." said Dash. "I'm Dash Baxter, master of bullying."

"Pull it off and you're in our group." said Nick.

They went out and ran 2 laps around the track. Carl was exhausted by the end of it, but Jimmy and Sheen had grown somewhat used to it. Neither of the new students looked tired at all. Dash was flexing his muscles, while Danny was just standing there.

"You've got to admit, Dash is hot!" said Libby Folfax. She was Cindy's best friend, and obsessed with music. She had brown hair and eyes, and was one of the biggest flirts.

"I'd have to agree with you." said Cindy. "Still, Nick's who I've got my sights on.."

"Don't worry, girlfriend, you'll be able to attract him. After all, he's very fond of cheerleaders."

Dash is the same way and Nick probably likes him for the same reason. Thought Danny. Now I'm going to have to deal with 2 bullies.

The gym teacher, Mr. Horid, was planning on playing football for P.E. He used to be a professional wrestler, and was just as fond of football.

The minute his back was turned, Dash sneaked up behind Jimmy and pulled his gym shorts down. Most of the class was laughing, and even Carl and Sheen found it funny. Only Danny stayed silent.

Needless to say, Jimmy was furious, but there was nothing he could do. The coach didn't believe him, since most of the class said he didn't do it, and Dash scared Carl and Sheen into silence.

He was relieved when it was over. He had often been tripped and pushed by Dash or one of his new buddies. In the locker room, Nick was rubbing it in his face. Sheen was about to defend him when he remembered Dash's threat.

The rest of the day passed by slowly. Jimmy noticed Danny was often talking with a girl that had came the same day with Mr. Jones. She was very likely his sister.

At last, they were ready to go home, and Jimmy, Carl, and Sheen went into the lab. Will was waiting for them, and immediately noticed how Jimmy looked.

"Can I presume gym didn't go very well?" he said.

"Did you expect it to?" retorted Jimmy, and he shot a look at his friends that clearly told them not to say anything.

"Not really, but let's go." said Will. "All we need to do is put in coordinates."

Jimmy set down the paper where he had written the coordinates that Seer had gave him, but he didn't want to use them, since it could easily be a trap.

Will was looking at options for the worlds they could go into. He packed his laser pistol and rifle. He was a hunter who eliminated dangerous creatures throughout the galaxy, so he had many enemies, and thus wanted to be prepared.

"Jimmy, how did your last chat with April go?" asked Sheen.

"Well, she doesn't have much to talk about." said Jimmy. "She's been made queen of her planet, since the rest of her family's dead."

"Well, you better give her same space." said Will. "She's probably grieving."

Carl handed Will the coordinates Jimmy wrote down that morning. Thinking nothing of it, Will set them in and the portal activated.

"Well, should we explore or what?" asked Carl. "I hope we can stay here."

"Come on, Carl." said Sheen. "We can see some amazing things."

"Still, I think we better be prepared." said Jimmy. "I'm going to get a few weapons. Will, watch those two."

Just as he returned, a tentacle grabbed Sheen. Before they could react, he was pulled through the portal.

Hopefully, that's sparked your interest. Review as much as possible and I'm open to suggestions.