This is the start of a Young Justice rewrite with a few extra characters.

Hope you enjoy this. :)

Young Justice: Agent Selene

Chapter One:

Piper smiled as she took a glass of soda from Alfred with a thanks. She was sat at the table in the dining room of Wayne Manor, with Dick studying her from the other end of it, with his sunglasses on. An Umbreon sat at her feet, drinking water from a red bowl with the name Ace on the side. "Are you going to ask me something or just gonna sit there judging me?" asked Piper, looking at Dick, revealing her Estuary English accent. "Because that silent routine only really works when Bruce is doing it." Dick glared at her from behind his sunglasses, as she continued "I know who you are, Grayson, there's no need to hide those eyes from me." He immediately stood up, before storming out of the room, looking about ready to hit something. Piper laughed before looking at Alfred. "Was it something I said?"

"I'm afraid this is a tough time for Master Richard," said Alfred, looking at Piper, with a small smile. "He has been going through a few things with Master Bruce." Piper nodded, at the same time as Bruce walked in. Alfred looked at her and said "I am sure he will come around."

"What happened?" asked Bruce, looking at Piper. "Why was Dick heading downstairs? I thought I told him to keep an eye on you."

"I guess I said something that rubbed him the wrong way," said Piper, shrugging. "When's whoever it was you called getting here?"

"Half an hour," said Bruce, sitting down in the chair Dick had vacated. "You have till then to convince me you're telling the truth." Piper nodded, as Bruce continued "Start from the beginning, how did you get here?"

"Truthfully, Mr Wayne, I have next to no idea," said Piper, with a small smile. "One minute I was in London getting ready to go to bed after a very long mission, the next I was in Gotham Park, with a bag of holding that housed six Pokeballs containing Pokemon including Midnight here, plus a bunch of stuff I kinda recognise…" She shook her head as she took a deep breath. "I honestly don't know how I got here." She looked at Bruce. "Is that what you wanted to know?" She sighed. "I left behind the love of my life, you know… And I'm not sure if this is a dream or if I went and died on that mission with M.I.5… But all I do know is Rose is out there in a different universe and I am here, with six Pokemon… Pokemon I'm not even sure I can take care of…" She stood up, rubbing her hand through her hair. "I need some air." She immediately made her way out of the room, with the Umbreon, Midnight, following. As she reached the door, she turned and looked at Midnight. "No, Midnight, stay." Midnight tilted his head but stayed, sitting down next to the chair Bruce was sat on, beginning to pout. As Piper left the room Bruce stood up and went to follow, only for Alfred to say "Give her time to cool off, Master Bruce. I presume she is going to have a hard time adjusting to this new life of hers."

"You're right as always, Alfred," said Bruce, sighing. "Call me when our guest arrives, I will be taking Ace for a walk around the grounds. Any chance you know where he is?"

"I last saw him sleeping in front of the fire in your favourite study," said Alfred, with a smile. Bruce nodded, before walking off.

Midnight looked around for a moment, pouting, before tilting his head at Alfred. "Um? 'Reon?"

"It's alright, you go and explore, I am sure Piper will find you," said Alfred, with a smile. Midnight appeared to nod before walking off, sniffing the floor. Alfred chuckled to himself before saying "Never a dull moment around here, eh, Sir." as he looked at the picture of Thomas Wayne on the nearby wall.

"You shouldn't be out so late, kid," came a gruff male voice, as Piper walked down a street in Gotham City. She stopped before turning, to see three men dressed in Riddler-garb walking her way, with knives in their hands. "These streets aren't safe."

"I think I'll be fine," said Piper, calmly, as she looked at them. She saw a black shadow dart across the alleyway they had walked out of and smiled. "You know, back home, I was a member of M.I.5. I know what you're thinking, I'm just a kid, M.I.5 doesn't hire kids." She chuckled, mostly to herself. "Well, that's the thing about being a spy. Nobody knows you're a spy." Before the leader could react, she had stepped forward and disarmed him, dropping him to the floor in the process. "I was top of my class in the physical departments." she said, with her foot on his back and his arm twisted around to his back. She looked at the others, as the black shadow drew up behind the two. "You might want to look behind you," she said, with a smirk. The two went to turn, but were knocked together as the figure stepped into the light. A girl with short black hair, around Piper's age, stood there, their knives in her hand. About to plunge them into their necks. "Stop!" said Piper, looking at her. The girl furrowed her eyebrows as she dropped the men, already unconscious, and Piper knocked out her guy, who had been whimpering in pain the entire time. "We don't need to kill them."

"Why?" asked the girl, looking at her, confused. "Bad men. Try kill you."

"I know, but if there's one thing I've learnt over the years, it's that heroes don't always have to kill," said Piper, looking at her. She reached into her bag and pulled out six zip-ties. "Help me tie them up, then I'll find a pay-phone and call the police." She winkled her eyebrows, before sighing. "Providing I remember the American non-emergency number…" She shook her head before handing two zip-ties to the girl.

Within moments, the men were tied up and the girl was studying Piper. "My name's Piper, by the way," said Piper, looking at her, with a smile. "Do you have a name?"

"Ca… Cass… Cassan..." she said, struggling. She frowned at her inability to say her own name, but Piper gave her a reassuring smile. Even if she was slightly shocked, now she knew exactly who this girl was, Cassandra Cain. That made so much sense…

"It's alright, I'll just call you Cass, eh?"

"Cass," said Cass, looking at her. Before smiling, a genuine smile. "Thank you."

"No problem, Cass," said Piper, looking at Cass, before the girl went into a fighting stance. Piper frowned, before feeling a looming presence from behind her. She turned to see Batman standing in the alleyway. It would have been intimidating, if Piper hadn't been paired with that M.I.6 agent for a few weeks during that big terror plot a few months back. "It's alright, Cass, he's a friend," said Piper, gently, looking at Cass. Cass furrowed her eyebrows again, studying Piper for a moment before she nodded and went back to a normal stance as Batman stepped out of the alleyway.

He looked at the three unconscious men and asked "Did you two do this?"

"Yes," said Piper, with a smile. "Cass did most of the work, I just took out one of them."

"Disarm him fast," said Cass, looking at Piper. A grin on her face. "You fast." Piper blushed, as Cass continued "No kill. Heroes no need always kill."

"Yes, that's right," said Piper, as she saw Batman's lips twitch slightly. She looked at him. "Have you contacted the police? I'm new to America, I'm not sure I could call the police if I tried…"

"They're on their way, I suggest you not be here when they arrive," said Batman, looking at the two of them, gruffly. "I'm sure your parents are worried. Gotham isn't safe at night for kids."

"We're just leaving," said Piper, nodding, before leading Cass away from the alleyway, making their way further into the city. Batman watched them leave, before using his grapple hook to climb up to the rooftop.

"So, Cass, where are you living?" asked Piper, as they stopped outside a diner. She smiled at Cass, there was something about the girl that made her want to protect her. "I can walk you back if you want…"

"I walk you back," she said, looking at Piper, protectively. Piper let out a small smile, she wasn't used to somebody wanting to protect her. Rose had been one of the only other people in her lift to do so. She took a deep breath, Rose… She already missed her. She was brought back to the real world when she heard Cass ask "Where you live?"

"Wayne Manor," said Piper, with a smile. She assumed she was living there, since Bruce appeared to be keeping his eye on her. She smiled at Cass again as she continued "Why don't I buy you dinner first? I'm starving, and, no offence, but you, er, look like you could do with a good meal." Cass tilted her head, obviously confused as to why this girl was being nice to her, as Piper gave her a genuine smile, before motioning to the diner behind them. As Cass' stomach rumbled. Piper laughed before saying "Come on." and holding out her hand. Cass seemed to flinch slightly before stopping herself and following Piper into the diner.

Soon enough, they had eaten and were now stood outside the gates of Wayne Manor. "Thanks for walking me home, Cass," said Piper, looking at the other girl, with a genuine smile. "Do you want to come in or are your parents waiting for you to get home?"

"No… no parents," she said, looking down at the floor. Before bolting away, back towards the town. Piper frowned as she watched the retreating figure, it had been going so well, and she had to go and mess it up. She sighed before making her way through the gates, downtrodden as she made her way up to the mansion.

Midnight started jumping up and down the moment he spotted Piper walking into the mansion, happy his trainer was back. Piper let out a small smile, one that didn't quite reach her eyes, as Alfred said "Master Bruce's guests have arrived, miss. They are in the main drawing room, Master Richard is entertaining them." Piper just nodded, without saying anything, before walking off towards the room she thought was the right one. Alfred just smiled and said "It's the other way, miss." Piper just nodded, still not saying anything, as she turned around and made her way into the room Alfred had indicated, with Midnight in tow.

"Ah, you must be Piper," said Clark, as Piper walked into the drawing room, to see Clark and Diana, her Lasso on her belt, standing around. Wally was stood talking to Dick in the corner of the room. "Bruce mentioned you know who we are."

"You're Superman, A.K.A Kal-El, Diana is Wonder Woman," said Piper, bluntly, a small smile that once again didn't meet her eyes on her lips. "And Wally over there is Kid Flash."

"Straight to the point," said Diana, looking at her, frowning slightly.

"Sorry, I'm just elsewhere currently," said Piper, as she sat down on the sofa, with Midnight lying down next to her feet. She sighed, as she began stroking the Moonlight Pokemon. "I was just walking through Gotham when I met this nice girl. She struggles to speak, but then verbal language isn't her first language… She reads body language, that's what she was taught..."

"You know who she is then," came Bruce's voice, from behind her. She turned to see Bruce walking in, with Ace at his side. "This Cass."

"I know who you all are, don't I?" asked Piper, with a small sigh. She had a small feeling Bruce knew more than he was letting on, but then he was Batman, he always knew more than he let on. "I'm surprised she didn't read the shock when she told me her name. I'm not sure I hid it well enough." She let out a deep breath. "I'm not telling you anything else about her."

"Okay," said Bruce, looking at Piper, with a nod. Piper smiled, as Diana and Wally gasped, while Clark and Dick raised an eyebrow. As Bruce continued "I know this may come as a shock to you, but I know when people want to keep secrets." He looked at the two adults. "I have decided to train Piper."

"WHAT?!" asked Dick, looking at Bruce, annoyed. "What skills does she have?! That creature?!"

"I saw the way she took down one of Riddler's henchmen earlier tonight," said Bruce, looking at Dick. That didn't surprise Piper, Bruce had arrived pretty quickly after she and Cass had taken down the henchmen. He had to have been watching. Though she wasn't sure she liked the idea of him following her. That was annoying. "She has what it takes, and we can train her." Dick scowled, before storming off, with Wally quickly following. Just as a woosh of air caused the papers on the nearby table to fly up before the Flash stood in the middle of the room. Holding a big sandwich in his hand. His back to Bruce and Piper. "Guys, Bruce has the fancy stuff!" he said, looking at Clark and Diana. "Do you know how much this stuff costs?!" Diana gave him a quick look as Barry's eyes went wide and he turned. To see Bruce looking unimpressed.

"Get out, Barry," he said, looking at the speedster, making Piper smile slightly. "Why are you here? I didn't invite you."

"Clark told me you invited the League," said Barry, shrugging. "And Dick invited Wally. It's not often I get a chance to look around your mansion… You rarely invite us here!"

"Of course," said Bruce, dryly. "You can leave now that you've seen the place."

"Bruce," said Diana, looking at him. "Let Barry stay, he's already here. And it's not you can't afford to restock your pantry." Bruce let out a small grown, causing Piper to chuckle again. And bring her to the attention of Barry, who frowned when he saw her.

"And you are?" he asked, confused. Before looking at the other adults. "Why are we using my real name?"

"She already knows who you are," said Clark, looking at Barry. "She knows my real name…" He looked at Bruce. "I don't believe you brought us here just to tell us you're getting a new partner. There's more to this than you're telling us." Piper smiled, Clark wasn't a journalist for nothing.

"He probably wants you two to vet me," said Piper, looking at Clark. "He's been entirely too trusting since I got here. The Batman I know wouldn't just take in a kid who happens to know a lot about you guys without vetting them first." She let out a small smile, as she eyed the Lasso on Diana's belt. "I see you have your Lasso, I don't mind being put under it. Especially if it'll help you see I'm telling the truth." She looked over at Bruce, but he was impassive as normal, so when he didn't say anything, Diana walked over and tied her wrists together using the Lasso. "It all started twelve hours ago..."

Later that night, Piper found herself unable to sleep. Midnight was curled up on the edge of the bed, watching her, while Piper was currently going through her bag. Five other Poke Balls sat on top of the dresser, alongside the sixth that belonged to Midnight. She let out a small smile as she rooted through the bag and found a very familiar folded bow inside. Causing her to grin, before pulling out the quiver she also recognised. Piper placed them both on the bed, before reaching into her bag again. This time she pulled out a black hooded jacket, causing her grin to widen. She pulled it on as she pulled out a pair of sunglasses from the bag. "Thank you, Roe." she whispered, as she put them on and pressed the side of them, causing them to expand into a domino mask, with solid white pupils. She then grabbed the quiver and slipped it on, before grabbing the bow as well. Piper smiled to herself, before walking over to the dresser and putting the Poke Balls into her bag. She smiled again before walking over to the window and opening it. She looked over at Midnight, who was looking at her with a tilted head. "Come on then, Midnight, heel boy." He let out a mew of happiness before following Piper out of the window.

Once they reached the city of Gotham, Piper let out a small smile and said "I know you're there." She turned around to look up at the nearby rooftop, to see Robin jumping down. "I clocked you following me five minutes after I left the manor." Robin scoffed, but didn't say anything, as Piper continued "Why are you following me? Batman appears to trust me."

"That's what I don't get," he said, looking at her. "He doesn't trust anybody."

"OK so trust might not be the best word, but he's keeping me close," said Piper, looking at Robin. "You know what they always say, keep your friends close, your enemies closer. Not that I think Batman thinks of me as an enemy… Though knowing him he's already working out a way to take me out if I start going bad…" Robin raised an eyebrow, as Piper rolled her eyes. "You do know that he has contingency plans for everybody on the Justice League, right?"

"Of course," said Robin, looking at Piper. She just smirked, she didn't believe him, but she let him have it. She went to say something, only for Robin to raise his hand and say "Robbery in progress, sounds like Harley, I gotta go." He pulled his Grapple Gun off his belt and fired upwards, disappearing onto the rooftops. Piper just smirked before looking at Midnight and saying "Two can play at that game." However, as she reached into her quiver to grab one of her grapple arrows, she heard sirens nearby. "And here I thought New York was the city that never slept." she said, looking down at Midnight, before following the sirens.

She knelt down on top of a gargoyle with Midnight perched in front of her, ten minutes later, watching the GCPD fish a body out of the river. She frowned, before grabbing a zip-line arrow from her quiver and firing it towards the dock. "Midnight, attach to me with Psychic," she said, looking at the Moonlight Pokemon. "I don't want to lose you." The yellow circles on his body began glowing with blue energy before he began floating and a purple aura came around both him and Piper. Piper smiled before hooking her bow to the zip-line that had been created and zipped down it.

"You one of Batman's prodigies?" came Commissioner Gordon's voice, as Piper landed next to a pile of crates. She pressed a button on her bow and the zip-line retracted back into the arrow, which she placed back in her quiver. Before she turned to look at the commissioner. "You could say that, yeah," she said, with a small smile, as she saw his pipe in his mouth. "I heard the sirens and couldn't help coming to investigate."

"Most people in this goddamn city run from the sirens," came a second male voice, causing her to turn, to see Harvey Bullock walking towards them. "It's the same as the others, commissioner."

"Of course it is…" said Gordon, sighing as he looked at Harvey. "I should probably contact Batman, he'll want to know about this…"

"Or I could have a look," said Piper, looking at the commissioner. "I was considered a pretty good detective back home." The commissioner looked at her for a moment, as she continued "I'm no Sherlock Holmes but I can help." The commissioner shared a look with Harvey, before he looked at her and nodded. Leading Piper towards the body, which a female detective was knelt down next to. Piper let out a small frown as she took in the body, that of a woman in her early thirties. Wearing a business suit. She looked familiar, and Piper gasped. "Stella..." she whispered, as she knelt down next to the body, joining the female detective. She pressed a button on her mask causing her white pupils to became blue as she scanned the body. "It's barely been an hour since she died…" she said, with a frown. "No water in her lungs… She was killed before she went in the river, there's some sort of toxin in her veins… And constriction marks…" She took a deep breath. "What did this to you?"

"We presume it's some sort of giant snake," said Gordon, reminding Piper she wasn't alone with the body. She turned to see the female detective stood next to Gordon and Harvey. "It's not unheard of for some experiment to go rogue in this city… But with Independence Day on Sunday, we need this thing caught."

"You presume it's actually rogue," said Piper, with a small smile. As she looked over at the other city across the river. "Where's that?"

"It's Metropolis," said the female, looking at her. "I'm Detective Sawyer, by the way. Why are you asking about that city?"

"Is this where all the bodies have turned up?" asked Piper, looking at Sawyer, ignoring the question. "Right here?"

"Yes, all five of them," said Gordon, looking at Piper, confused. "Why?" Piper just let out a small smile, as she looked at Gordon.

"Can I have a look at the other bodies? I need to check something."

"Check what?" asked Sawyer, looking at her. "We've already checked everything with those four…" She raised her eyebrow. "Is this to do with what you called her? Stella? Do you know her?"

"Maybe," said Piper, looking at her. "She looks like somebody I knew back in London…" She took a deep breath, before looking at Gordon. "Can I see them?"

"I'm sorry, Miss, you seem nice but I can't let you into the morgue," said Gordon, looking at her. "Thank you for your assistance, however." Piper sighed but nodded, before walking off, with Midnight following.

Half an hour later, she was perched on a gargoyle near the main GCPD building, after putting Midnight back in his Poke Ball. She had followed the coroners van back, and it had gone into the building about five minutes beforehand. She smiled as she pressed the button on her mask again, before pulling a zip-line arrow out of her quiver and fired it at the top of the GCPD building, at a place the guards were currently not looking. Near a vent cover. She smiled as she flew across the street. Piper slipped into the vent at the same time as an officer turned the corner and lent against the vent, lighting up a cigarette.

Piper took a deep breath as she dropped out of the vent into the dark, silent morgue. She quickly looked around, seeing nobody around, before pressing the button on her mask again, causing the pupils to become white once more. Before walking over to the five bodies on the tables. She took a deep breath. Each of them were familiar. Not just Stella, but Oscar and Carrie… Her teammates back home. The other two were agents she didn't know well, but she recognised both of them. They had been nice to her. All five of them had the same constriction marks, and the same bite marks. Their deaths had been the same. "Find anything out?" came a gruff voice, from behind her. She turned, startled, to see Batman and Gordon standing there. The lights turning on as they appeared in the doorway. "Anything stand out?"

Thanks for reading. Hope you enjoyed it. :)