Although I posted the other YJ fanfiction before I did this one, this is really my first ever Young Justice fanfiction. I'm very thankful that an idea came to me for one, because I honestly love the show so much! :)
Anyway, this will be a multi-chapter story. I was going to wait until later to post this, but since a new YJ episode is coming on tomorrow, I decided that I'd post it today. Just so no one forgot about the "Failsafe" situation.

Also, for the record, I'm not sure when I will be able to update my chapters and cannot guarantee on it right now; but I'll do my best. I promise. =]

So... here it is! I hope you enjoy it! ^_^

Chapter One.

J'onn had sent Megan to her room after comforting her. Guilt was driving him crazy. After sending the children to the trainning session that had gone wrong, he had regreted ever putting them into such a dangerous situation.

Of course, until then, he hadn't known how much power Megan's abilities had.

The whole thing had terrified his niece, though, causing the martian to be even more concerned than before.

Black Canary had taken the time to check up on the rest of the Young Justice team. Artemis seemed to be the least shaken up of the group. Having not witnessed many of the incidents, not much fear had found itself inside of her. Of course, that didn't mean that she was was not bothered at all.

Conner was angry that Martian Manhunter had upset Megan so much. He didn't look at all worried by what had happened during the simulation. All he cared about was finding Megan to make sure she was okay.

Kaldur was more concerned about his team than anything. He asked if Megan would be all right and made a point to check on everyone else.

Wally was relieved that it had only been a simulation, but was still a little scared because he'd thought that Artemis had died. He would never admit that out loud, of course.

Robin didn't really say much about how he felt about everything that had happened, but kind of just watched the rest of the team.

Bruce glanced over at his young sidekick before walking over to J'onn. He laid a hand on the alien's shoulder. "It wasn't your fault that the training simulation didn't go as planned."

J'onn sighed. "I did not know what great power my niece's abilities held. I put the children in great danger."

"No one knew that it would go wrong, J'onn."

"It terrified her, though. And the rest of the team as well."

"They'll be fine." Bruce couldn't help but glance at Robin again. He hoped the teenager would be all right. "It wasn't your fault."

"I do not want them to live in fear."

"It was just a simulation, J'onn. They know how that none of it was real."

J'onn almost fell over again. Bruce steadied him before turning to the Young Justice team. "You all need rest. I expect you all to go home and take it easy for a little while."

He turned to Kaldur and Wally. "I'll call Barry and Arthur to take you two home. Artemis, Oliver will make sure you get home safely." He looked at Robin. "Let's go."

Robin headed for the exit.

Bruce stopped by Conner before he left. "Will you be okay?"

Conner wore a strong, cold expression. "I'm fine."

Bruce was skeptical, but nodded, thinking again about how Superboy really needed Superman. He left the room without another word.

It was later that night, around 2am, when Conner finally gave up on trying to fall asleep. He was too concerned about Megan. Finally, when he was frustrated enough, he got up. He had to make sure that Megan was all right.

The hallway was pitch black when Conner opened his bedroom door. Thanks to his super vision, though, he could see pretty well. He could also hear footsteps coming from another hallway.

He listened intently, waiting to hear something that would give a signal as to who it was coming down the hallway. He took note of the fact that the footsteps were light, very unlike those of a masculine villain.

He stayed in the shadows, ready to fight if needed.

The footsteps were getting closer to the corner of the hallway.

"Conner?" came Megan's voice inside his head. "Are you awake?"

"M'gann!" he exclaimed, still talking in his mind. "Is that you? Coming down the hallway?"

"Yes." Finally, she came around the corner. Like Conner, she was dressed in her everyday outfit.

He noticed her upset face immediately and hurried over to her. "Are you okay?"

She looked close to tears. "I don't know. After that training simulation, it's kind of hard to tell." She paused. "Conner, it was my powers that caused all of you to believe that all of those bad things had happened. I couldn't control it. And I had to watch all of you..." It was then when she finally started to cry.

Conner put his arms around her. He wanted to comfort her as best as he could. "M'gann..." He didn't know what to say. Sure, he and the rest of the team needed some time to get over what happened, but he realized that it was worse for Megan. She had living through it all. "It was only a simulation. We're all fine."

"But my powers..."

"Your powers are what make you who you are." He shook his head angrily, thinking only of how wrong the whole situation had been. "The Justice League think they know what's best for us. But every time they do something for us, it blows up!"

"No, Conner. Uncle J'onn didn't mean to-"

"You know what I mean."

She tried to wipe some of the tears from her eyes. She understood what he meant. She was quiet for a while. "Do you think the others are okay?"

"I'm sure they're fine," Conner answered.

Megan was about to add something else, but a tapping noise was easily heard from elsewhere in the house.

Conner's eyebrows furrowed and Megan turned herself invisible.

It was good on their part that their conversation had remained telepathic. They listened intently as the tapping continued.

Megan flew into the air, heading down the hallway in order to investigate. Conner followed her with silent footsteps.

The tapping noise went on, but even so, it was a hard noise to track.

They followed it until they reached the kitchen. By then, it had stopped, leaving the martian and the Kryptonian very confused.

Conner scanned the area behind them with his more-than-perfect vision, looking for anyone that might be lurking in the house.

"Superboy! Look!" Conner turned at the tone of Megan's telepathic message.

She was pointing at the window, her eyes wide. The glass had been shattered, leaving shards of glass all over the counter and the floor.

"Who did this?" Conner asked.

"I... I don't know."

Superboy looked harder at the counter, immediately noticing a small, folded piece of paper. "What's that?"

Miss Martian saw it and moved it with telekinesis. Once the paper was in her hands, she unfolded.

It read: Your dumb security system is nothing when I'm around. Just wait. I will take out you and your team. And that's not a threat. It's a promise.

Thanks for reading! Review if you like it, please! ^_^