Disclaimer: I do not own Danny Phantom, Super Girl or any of the characters. Danny Phantom is the sole property of Butch Hartman, Nickelodeon and Viacom International. The Justice League Animated Series is the property of the DCAU.

The Ghost Boy and The Super Girl

Chapter 1: Prologue

We all know what the universe is. We know that it was created in an giant explosion called The Big Bang, which created it, along with millions of it's planets, stars, suns and so forth.

The universe is large, with millions of planets, some of which have life of it's very own.

One such planet is earth, which is home to many unique creatures of various shapes, sizes and species. The most complex of these species is the human race, who has evolved over the centuries to becoming the dominant species of Planet earth, having created a civilization, weapons, and technology that has helped them thrived as a species over the years.

And it was humans that were curious as to how the universe was created and why we are all here? They knew now how the universe was created, how their planet was created and how they became so advance.

Humans, thought investigation and trial and error, managed to find the answer to those questions such as how the universe was created and how they came to be, but there is still one question that they still had no concrete answer to.

The answer to the one question that has been on their mind since mankind first traveled through the stars.

Are we alone in the universe? And are there more universes out there?

Well, the answer to that question can be described in this sentence.

We are not alone, as the universe that we live in is not the only one in existence.

There are others...also full of life.

In One Universe

In Amity Park

One of these universe had the planet Earth, which has a connection to a strange dimension called the Ghost Zone, which is home to strange beings called "ghosts", creatures that come in many shapes, sizes and breeds and also each ghost possess it's own set of powers, both unique, spectacular and sometimes, even dangerous.

In this world, there is one person who has made it his mission to battle these ghosts to protect his home from those who seek to harm it.

A creature that is a halfa, a being who is half ghost and half human, who has his own set of unique powers, which he uses to protect his home and those he loves.

Danny Phantom.

Our young hero, Danny Phantom was now currently in his human form, Danny Fenton, as he just walked away from school with his best friends, the meat obsessed tech geek Tucker Foley and the nature-conscious vegetarian Sam Manson.

Danny wasn't in a good mood since today he was stuffed in a locker by Dash, got a D on his math quiz and had to deal with another attack from the Lunch Lady who was mad about the quality of meat that they were serving today, the Box Ghost who was pestering him for the zillionth time and also Johnny 13 and Kitty, who have had yet another one of their infamous spats and Danny had to break them up before they got violent...again.

At the very least, it was Friday and he managed to at least avoid getting Saturday detention again, so that has to count for something.

"What a day...I thought it never end.."Danny sighed as he exited the school.

"So, any plans for this afternoon...it is Friday?..."Sam asked.

"How about we all go to the arcade? They just installed that new game called "Blood Warrior" and they say that it's suppose to be intense..."Tucker suggested, while Danny smiled and nodded.

"Cool..i'm there..."Danny said, before realizing something.

"Actually Tuck, and Sam I'll join you later...I just remembered that I have a few creeps that I need to send back to the Ghost Zone ASAP..."Danny said as he gestured to his thermos.

"You need any help?...'Sam offered.

"Nah, I got it...you guys go on ahead and I'll join you guys later..."Danny said and his friends nodded.

Danny soon left to get home to Fenton Works to deal with sending the ghosts he captured today back to their home dimension.

The sooner that he is done with that, the sooner he can join his friends in partaking in a series of violent, mind numbing video games which would be the start of a hopefully uneventful weekend.

He had no way of knowing that once he got home, his weekend would not be uneventful...

Not at all...

Meanwhile

In Another Universe

Metropolis

In this Universe, there are many creatures aside from humans and ghosts, that have had a deep affect on humanity.

Many extraordinary beings such as aliens, witches, sorcerers, artificial humans, mutants, speedsters, amazonian warrior women and even Gods and spirits themselves lived in this universe.

And in one corner of the universe, at least one of each were all in the same location.

The Watch Tower.

The headquarters of the Justice League, an organization that composes of the Universes's greatest heroes, who have all come together with one mission only.

To protect their home and try to bring peace and order to the planet called Earth.

One of the members of the league is a young, blonde girl in a white, red and blue costume, who was currently in the league's cafeteria. It seems that the founding members of the league has just had a big meeting discussing one of their biggest enemies, CADMUS and they were trying to think of ways to end their operation for good without it having to turn into some kind of war.

This young heroine is called Kara In-Ze, known on Earth as Supergirl, who also happens to be kin to one of the leagues founding members, the legendary man of steel, Superman.

"I still don't see why we can't just go to Cadmus and take them down by force, we know that Waller is behind them..."Kara said to Superman.

"Kara, it's not that simple, Waller has connections with the US. Government, including the White House...it's not as simple as fighting against one of Luthor's robots..."The man of steel said, while Kara didn't look satisfied.

The young blonde girl sighed, before looking to her cousin.

"Kal El...Every minute that they are out there, Cadmus is getting stronger by the day, especially since they added her..."Kara said in anger and Superman knew whom she is talking about.

Her clone, Galatea.

"Kara, Galatea hasn't been seen since in months since she was electrocuted and our sources say that she is still in a coma..."Superman said, while Kara still didn't look to sure.

"Kal El...Me and Galatea have the psychic link...even if she is still comatose...I can still get images...I can't explain it but...I keep having the feeling that she could come back at any time..."Kara said, expressing her worry and Superman heard this and sighed.

"We'll look into it, and be on the look out, just in case..."Superman said and Kara decided that it will have to do for now.

That was the conversation they had before she went to the cafeteria to get something to eat, before looking out the window, seeing the endless stars in space that surrounded The Watch Tower.

"I'm over thinking it...Kal El says that Galatea is still comatose and his sources are never wrong, especially since one of them is Batman..." Kara thought before sighing.

She knows that if Galatea was to come back, they'd know...

The young blonde heroine, then finished the sandwich that she had gotten for herself and then decided to distract herself in the league's training room, since super powerful or not, she won't allow herself to get rusty...just in case.

Yes, there were just two different people, from two different universes, with two different missions and two different lives.

They live separately from each other and it was unlikely that these two beings would ever have the chance to meet...

Until one miscalculation changes everything.

-To be continued-

Next time on The Ghost Boy and The Super Girl

Uh Oh!

AN: Just so you know, Danny is 16 here since two summers have passed in the series, and people have said that he is suppose to be 16 in Season 3, which this story takes place in.

:) I hope you enjoyed this! Remember to read and review :)