I'm so happy that this story has gotten such a great response, and considering I finally had a couple of hours free, I decided to give you the next chapter! Yay! :D I will try my best to update as often as possible, but because of work I won't be able to update daily :( Being a responsible adult sucks sometimes, especially when I want to write fanfiction for lovely readers like all of you! :)

Thanks so much for all of your support, feedback and suggestions! I really appreciate it and I'm so happy you are enjoying the story so far! :)

BayGirl31

I do not own Danny Phantom, Young Justice or their characters. All rights belong to their respective owners.

Location: Mount Justice

Date: September 3rd

Time: 2013 EST

Danny couldn't help but openly stare at the base made from the hallowed out mountain. Compared to his parents' lab… No, it is a shame to even try to compare them. This looked like something straight out of his comic books! There were devices and computers everywhere and he could only wish that Tucker was here, he would love this place!

They arrived at the door to the training room and Danny was snapped out of his thoughts by the sound of Robin announcing that they arrived. Once the door to the gym opened, Danny's expression became that of pure awe. The room was huge! There were punching bags, gymnastic equipment, targets, a wrestling ring, a swimming pool, weights, treadmills, obstacle courses of different kinds, and best of all, really high ceilings.

"Whoa… This is awesome! You mean that you get to train here whenever you want?"

"Of course! Although, Superboy and Miss M are usually the ones to use it the most since they live here. The rest of us use our own facilities most of the time." Robin said to answer Danny's question. "We have to wait for Aqualad to return before you can begin your demonstration."

"So, do you think daddy-bats is going to show up to watch the show?" Kid Flash asked the boy wonder, who just gave him his best attempt at a bat-glare. KF wasn't fazed by it, but Danny was.

"Note to self: Don't get on Robin's bad side." Robin turned to Danny with his one of his signature grins. For some reason Danny couldn't figure out, this masked teen sent shivers down his spine.

"What's the matter there Danny?" Robin asked tauntingly.

"Nothing. Just wondering why a human is giving a ghost the chills. And here I thought it was supposed to be the other way around." Danny replied just as teasingly, causing KF and Artemis to chuckle and M'gann to just be confused. She knew very little about ghosts, and what she did know came from the stories her uncle J'onn sent back to Mars.

The sound of the door opening alerted the teens that someone was entering the room; Aqualad and The Dark Knight himself. Seeing the new figure approach him, Danny narrowed his eyes slightly and tensed his muscles a bit. What? It's a reflex when meeting new and intimidating looking people.

"Hello. You must be Danny Phantom. I am Batman, the overseer of missions for this young team of heroes. Aqualad has filled me in on your situation and I wanted to observe your abilities for myself. Team, today this will count as training so I asked Black Canary to pass for today."

"Umm…OK?" Danny replied. "So what do you want me to do?"

"Do whatever you need to show us your abilities."

"Well, I guess I'm going to need those sparing partners to do that." Danny, Robin and Superboy walked a small distance away from the group to get more room. "Now remember, I want you both to give it your all. Throw everything you got at me. Understood?"

"If you're sure that's what you want. You don't have to ask us twice. Let us know if you get too tired or anything and we will stop the demonstration." Robin replied. Danny grinned, "Sure thing. But I should be the one to say that to you."

Batman stepped forward. "On my mark," the three teens took battle stances, "Go."

Robin rushed forward, throwing punches and kicks at the young halfa. Imagine the young hero's surprise when the white-haired teen was effortlessly dodging them. Even when Superboy had joined in, they weren't able to land a single hit. While Danny was dodging their hits, they were strategically backing him up against a wall, trying to corner him. When Danny's back hit up against the wall and he saw the look on Robin's face, he gave a confident grin. "You forget who you're up against don't you?" With that Danny flew into the air and floated in an Indian-style sitting position as he taunted the teens below him. "Sorry to tell you but I fight in the air with no form of friction to stabilize my stance like there would be on the ground. That means you're going to have to do better than that traffic light."

"You asked for it." Robin replied while whipping out some of his exploding disks and throwing them towards the ghost boy while Superboy jumped toward him. Danny just chuckled, turned intangible and invisible, and dodged the oncoming attacks. Robin quickly turned to Kid Flash. "KF! Goggles!" Catching the goggles thrown to him by the young speedster, he quickly put them on and searched for Danny's heat signature. Even if his temperature is a lot lower than normal, he still gave off a reading. Throwing a bird-a-rang at the floating 'heat' mass, he hoped to catch him off guard, but no such luck. He did succeed in getting the young ghost in coming back to the visible spectrum. "Well, looks like you're more resourceful than the people where I'm from." Danny said with a smile, clearly enjoying this, and even allowed Superboy to grab him from behind.

"Sorry dude, but you can't catch me that easy." Danny then went intangible and phased out of his iron grip, becoming solid once more when he was safely floating just out of arms reach. "Come on guys, you can do better than this!"

"Team," Batman spoke up. "Everyone get in there. Give him everything you have. We need to test his limits."

Kid Flash started to run for Danny who just flew up higher than the young speedster could reach. "Hey, that's no fair! You can fly!" Danny chuckled. "Sorry man. You got your gifts, and I got mine. And trust me, you don't want to go through what I did to get my powers. Whoa!" Danny quickly flew out of the way of some oncoming arrows. Then Robin decided to get in on the action and threw bird-a-rangs and explosive disks while Artemis fired arrow after arrow at the white-haired teen floating above their heads. A green 'bubble' appeared around him that deflected everything that was thrown at him.

"Whoa! How did he do that?" Artemis asked with shock evident in her voice. "I don't remember the ghosts from the kids' stories having that kind of power."

Danny let down his ghost shield and created a few low powered ecto-blasts in the tips of each of his pointer fingers. "Hope you guys are good at dodging!" He announced joyfully. "Because this might sting a little." Danny said as he began shooting low powered ecto-blasts at the team, causing them to dodge and run for cover. He then noticed that Miss Martian and Aqualad were nowhere to be found. Looking around, Danny managed to pick out the outline of the Martian and carefully aim a couple of ecto-blasts to just miss her. He put his ecto-shield back up as he saw Robin and Artemis resume their previous attack with the addition of Aqualad, who was now standing next to the pool and manipulating the water into projectiles. Danny smirked as he came to a realization. Turning invisible and dropping his shield, he quickly flew over to the pool area and reappeared just above Aqualad. "Chill'n by the pool? Great idea! Here let me help with that." Danny said as he raised his right hand. The team stared in amazement as his eyes turned from their usual glowing neon green to glowing ice blue; this same color covered his raised right hand as he directed the ghostly energy to the pool. The water started to freeze over, and in the matter of seconds it was completely froze over to a depth of about 10 inches, rendering Aqualad's attacks useless.

"I heard of ghosts creating a chill in a room, but that's just ridiculous." Wally mentioned.

Seeing the look on the teens faces (And maybe even Batman's, but we will never know), Danny decided to have a little fun since he was already doing this. Resuming a stiff upright position, he smiled, waved with his right hand, and sank into the ground. Reappearing behind the black-haired caped teen, he floated on his back with his head arched backwards (like he was upside-down on a sofa), smile plastered on his face, and said "Boo!" into the young Robin's ear, resulting in a reaction in the form of a slight jump not too often seen in the teams young 'ninja'. Danny laughed at the reaction he received. "Does this mean we're done now?"

"Okay, so maybe ghosts do exist…" KF said. "There! I said it!"

"Not only did you make him speechless earlier today, but now you have him, a scientist through-and-through, admitting that there is such a thing as ghosts. You are good." Artemis commented, trying to lighten up the mood in the room. It wasn't a depressed or sad or angry mood, just a shocked, amazed, and confused one; not as awkward, but still awkward none the less…

"You seem to have many abilities as well as the knowledge of how to use them properly in battle. You defeated my entire team single-handed and you were only toying with them. Your abilities are very impressive." Batman stated to the young halfa.

"Yeah, what exactly did you do anyway?" Robin asked. "I have never seen most of those abilities before."

"Well, I have flight, invisibility, intangibility which allows me to pass through solid objects, and I can use and manipulate my ecto-energy to create beams or shields. I also used a power that is directly tied to my core, the ghost equivalent of a heart, which for me is ice and allows me to use ice powers." Danny decided not to let them in on his overshadowing, duplication, teleporting, telekinesis, and the healing power he has been working on. 'No need to show them everything yet. I will use the others for emergencies only, especially my ghostly wail.' He looked around at all the intrigued faces surrounding him, and when he seen Miss Martian he remembered that she never done anything to try and stop him. "Hey Miss M? I was just wondering why you didn't attack me like everyone else? Aren't you part of the team as well?"

She nodded. "Yes I am part of the team and yes, I did try to stop you, but I failed. I thought that since direct attacks clearly weren't working and neither was my attempt to trap you in a telekinetic-field, maybe an indirect attack would so I tried to enter your mind to slow you down."

"So why didn't you?" Robin asked the green-skinned girl.

"Because it seems that he has a strong mind barrier that prevents me from getting inside. Kind of like when I tried to enter his mind while he was unconscious."

"Oh, yeah, sorry about that but I have had way too many experiences with mind control and other ghosts trying to overshadow me that I sort of trained my mind to keep up its own type of shield to help keep me safe from future attempts."

"I never knew such a thing was possible."

"You also didn't think ghosts were possible either KF, yet here's proof in the living..er, I mean, half living flesh."

"You have an amazing amount of power and your potential may be far greater than you may believe possible." Batman stated as he stepped toward the white-haired teen.

"Batman, do you really think he has that much power? He seems really powerful already, and you're saying that there is a possibility he may become stronger!?"

"I do Robin. That's why I have made this decision: Danny Phantom, I wish to extend an offer for you to join this team of young heroes. Since you do not know how long you will be remaining here, I feel it would benefit us all if you join the team so you can help them on missions while you are provided with a place to stay as well as a source of possible leads to maybe one day bring you back to your own dimension."

Danny stood there dumbfounded. He wasn't here more than 2.5 hours and already he was asked to join a young team of superheroes. "I, Um, I…. I….Ahh…"

Kid Flash smiled and placed his hand on Danny's shoulder. "Dude! You just made, like, superhero history! Batman has never trusted anybody that fast! Well, besides Rob but that's beside the point."

Artemis turned to look at Miss M "Looks like he is making history everywhere today."

"As leader of this team, allow me to say that it would be an honor to have you with us on the team Danny Phantom, that is, if that is what you want." Aqualad assured. "We do not wish to make you feel overwhelmed with everything happening all at once. If you wish to have more time to think it over, we understand."

Danny took a deep breath and looked to the faces of the team. He felt like he belonged here. They never judged him for being a ghost or tried to attack or hurt him, they just welcomed him with open arms. Once he came to this realization, his face and eyes became determined and he gained his small grin. Turning to face Batman head on Danny held out his hand. "You got yourself a new member."

Batman returned the handshake before turning to send a 'look' toward Robin, whose eyes widened at the realization of what that look meant. Batman turned to face Danny once more, "Well, we are going to have to try and find a way to disguise you. You are a teenager after all, and that means you have to attend school like everyone else."

Danny grinned. "No problem. After all, I am still half human remember?" A white-blue ring appeared around his waist and proceeded to split in two with one ring travelling down to reveal the lower half of a white t-shirt, faded blue jeans, and red sneakers while the other ring traveled upward to reveal the rest of the t-shirt, black hair, and vibrant blue eyes. "Hey! It worked!" Taking in the shocked looks on the faces of his new team-mates, Danny smiled and gave a small wave followed by a playful bow. "Danny Fenton, 15 year old human-ghost hybrid from Amity Park at your service."

"Okay, I am officially whelmed."

"What is it with you and this whelmed thing?" Danny asked, reminding Robin of when a certain speedster asked him that same question back when they infiltrated Cadmus. Danny then felt a large hand on his shoulder which caused him to tense his muscles involuntarily. Turning his head slightly, he could see that it was the intimidating figure of Batman.

"Danny, I would like you to come back to Gotham City with Robin and I. There you would have a place to stay, I can be sure you are going to a good school, and I can keep a watchful eye on your training and progress."

"T-thanks Batman. But you don't really have to. I-I can probably find a place to hide out if I need to."

"I will not allow a child, especially one from another dimension, to try to find a place and fend for themselves when I can provide it for them. End of discussion. Follow me." Batman turned and headed toward the zeta-tubes, calling over his shoulder to his protégé as he went. "Robin, let's go help Danny get settled in."

Robin couldn't help but have a bit of a spring in his step now. He finally got the closest thing he could probably get to a brother!

As Batman typed in the code into the Zeta tubes to give Danny his own way to and from the cave and Batcave, he let out a small smile that went unnoticed by the others. Seeing Robin interacting so happily and freely with Danny, especially since Danny was in his human form which looked a lot like Robin's secret ID, made them look a lot like brothers. As a father, all he wants is for his adopted son to be happy.

"What do you use as your hero ID?" Batman asked Danny who was looking at the zeta tube with a confused but intrigued look. "Back home I called myself 'Phantom'. That OK, or is it already taken?"

"Phantom is fine." When Batman was finished entering Danny's information and quickly explaining what the zeta-tube does, Robin and Danny waved goodbye to the team while telling them they would see them tomorrow, and disappeared in a flash of light.

As his new friends faded from sight, Danny thought of all the things that will be different for him now. This is now his life, no matter how temporary or permanent it may be, and he was going to take each day for all that it was worth. Today, he started his new life.

So that's the end of chapter 4 :( Hope you enjoyed it! Like I said before, I work crazy hours which results in little time to do... anything really... Sorry I don't update as often as I would like but I will try my best to upload once a week! If I go more than a week without updating, feel free to PM me and bug me until I do :)

BayGirl31