A/N: Okay, I'm posting this as a prize to myself for getting the fifth chappy of Changes of Heart out. Lol. Anyway, IMPORTANT NOTE AT THE END! That said, enjoy!

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"Guys!" raven-haired, blue-eyed, 14-year-old Danny Fenton yelled as he ran over to his two best friends. "Hey, guys! You won't believe what happened last night!"

"You got a new ghost power?" asked Tucker Foley, Danny's African-American friend, and one of the very few people who knew about Danny's ghost-half. He had abandoned his PDA to hear Danny's news. He turned his blue-green eyes to his friend while adjusting his red cap and thick glasses.

"The ghosts have decided to leave you alone?" Sam Manson, Danny's friend-who-happened-to-be-a-girl, suggested. She too knew about his ghost problems. Her black hair and violet eyes gave her that Goth-look she liked so much.

"In order: Not that I know of, and I wish!" Danny said, sighing. "Look, guys, I had this weird dream about a math convention—"

"Math convention? YOU? Wow, that is weird!" Tuck exclaimed.

"Thanks, Tuck, I really needed that. Anyway, at the end of the convention some guy named Dr. O'Nearpath started talking to about nine others about Inviso-Bill."

"They were talking about you?"

"Yes, Tucker," Danny said angrily. "Anyway, most of the people didn't believe him, but one person did. Someone named Charlie Eppes."

"The Charlie Eppes?" Sam asked. "As in Charlie Eppes, the person who helps his older brother Don and the FBI by solving math equations pertaining to the cases they're working on?"

"Uh, I guess," Danny answered. "How do you know so much about him?"

"Honestly, don't you two read?"

"Not really," Danny and Tucker replied.

"So, um, Dr. Eppes believed Dr. O'Nearpath for some weird reason. Then, some guy who already knew Dr. Eppes—"

"That would probably be his friend, Larry Fleinhardt," Sam said.

"Right. So, Dr. Fleinhardt tells Dr. Eppes that there's no such thing as ghosts—"

Tuck snorted, "Yeah, right!"

"—Dr. Eppes turns back to him and said that mathematically, there are ghosts. No clue how, but yeah. He also said that he'd seen one before."

"Oh? Which one?" Tuck asked.

"I'm getting there! He started describing the ghost, and it sounded a lot like Skulker. Then, at the very end, something said, 'They'll believe soon enough. O'Nearpath is first, he's expendable.' Then, there was some laughing—"

"Maniacal laughing, or 'someone-just-told-a-funny-joke' laughing?"

"Definitely maniacal. And the name kept echoing over and over. That's when I woke up."

"Wow," Tuck and Sam said.

"But," Sam said, "it sounds like Dr. O'Nearpath is in trouble!"

"Huh?" the two boys questioned.

Sam sighed in annoyance. "Whatever that thing was, I think it's gonna kill Dr. O'Nearpath!"

"That 'thing' was a ghost," Danny answered. "Probably a new one. He looked vaguely familiar…"

"You mean you saw him?" Sam asked.

"Only for, like, two seconds!"

"Well, what did he look like?"

"I don't remember! All I remember is that he looked familiar!"

"Oh."

"But, it's probably nothing—" Danny was cut off by his "ghost-sense". "Guys, I'll be back in a little bit."

"The excuse?" Sam asked.

"I bought lunch."

Sam and Tuck winced at the thought. "Good one." They headed towards their next class. Danny, on the other hand, ran into an empty classroom.

"I'm goin' ghost!" he said. The two rings appeared at his waist, one going up, the other going down, transforming him into Danny Phantom a.k.a. Inviso-Bill. He flew out through the wall and found himself face-to-face with someone he had fought many times before.

"Skulker," Danny said angrily. Skulker just grinned.

"Ah, Ghost-Child," he said, "so, you did come." His glowing blade appeared. "Well, you'll be coming with me now."

"Actually, no I won't." Danny looked around. There were at least twenty people walking around, not noticing the impending fight. "I'm not going without a fight."

"Alright, then." Skulker started coming at Danny, who backed up in fright.

"But not here! There's too many people here!"

"Of course. The Ghost-Child doesn't want to hurt innocent people. How noble," Skulker said sarcastically. "Where will we fight, then?"

Danny got a great idea. "Follow me."

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Outside LA

They came to an empty lot just outside of the LA city borders. Danny stopped, but Skulker kept going. When he noticed his prey had halted, he went back.

"So," he said, "we'll fight here? Aren't you worried about the innocent people who live there?" He pointed towards the city.

"That's why I'm making some rules," Danny replied.

"Who says I'll follow them?"

"You know how Walker is about rules."

"…Right."

"So, here are the rules: 1) no attacking innocent people, 2) no going within the city, and 3) we're fighting invisibly. Got it?"

"Yes, now let's start!"

Skulker and Danny went invisible and began their fight. They started out by firing ectoplasm at the other. It didn't work too well, considering they really couldn't see each other. They both flew back to the middle of the lot and fought physically, kicking and punching and occasionally shooting more ectoplasm. Slowly, the area around them was being torn apart and destroyed. They kept fighting for a few hours before both fell to the ground.

"Time out," Danny said, panting, still invisible, and trying to maintain his ghost-form. He looked around and gasped at the mess. "I'm in so much trouble!"

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A/N: Yay! Okay, um, I have a now-official update schedule! Here it is:

Fridays- Changes of Heart

Saturdays- Dad's Letter

Sundays- A Halfa and A Genius

If I update, it's gonna be on one of those days! Some stories may come out on a day other than when they are scheduled, depending upon how much time I have during the week. Bye, y'all!