AN: I don't own any of this nor am I trying to profit from it. Any similarity to real people or events is entirely coincidental. This story is finally being updated/completed, and as such there is new material in this first chapter, so even if you've read it before, read it again!

CONTINUITY NOTES: The setting is during, or just after, the final season of the JLU cartoon and may have some mention of events in my other stories: Rich Boys and My God is Named Kyle (the latter, not so much though). The Young Justice canon is based on the comics with some variations (such as Superboy already getting his Conner Kent identity). There are some mentions of DCU storylines such as Identity Crisis, and the Batman arcs with Spoiler. Young Justice was always a comedic series, and I tried to preserve that sense through my jabs at timeline and continuity in the general DCU. I don't claim expertise on any of the comic timelines so any glaring errors should be pointed out so that I can do my best to retcon them (in a traditional comic book fashion).

A Multi-verse Event: Young Justice, meet the Justice League Unlimited

Part 1

"Dude, your Watchtower is a satellite, sweet." Superboy tipped his sunglasses down and gazed around the control room of the Watchtower.

"And just who are you supposed to be?" Conner turned to find an irate Clark standing behind him, flanked by Batman and Wonder Woman. The Flash, Martian Manhunter, and the Green Lantern were standing on the platform above, staring at him in varying degrees of annoyance, skepticism and interest.

"Eh, nice place ya got here," Conner floated up a little bit to get a better view, an action that caused many in the room to shift their expressions.

"Answer the question." Batman growled.

"Eh," Conner grinned sheepishly, "What was it again?"

"Who. Are. You?"

"Oh, I go by Superboy, but you guys can just call me Kon… unless I'm in trouble of course."

"Superboy?" Flash spoke up, zipping down to the transporter, "Isn't that like, copyright infringement or something?"

"Oh shut up, and I told you to call me Kon."

"Sure, kid." Lantern said floating down to join his teammates.

Conner growled angrily, "I just can't escape that one can I… no matter what universe I'm in…"

"You're from another universe?" Wonder Woman asked, drawing Kon's attention to her.

"Er… yeah… I think-"

"We should take this somewhere more… private," Batman interrupted, glancing around at the gathering crowd of superheroes entering the control deck of the Watchtower.

"Agreed," Superman stated, motioning for Conner to move in front of him. The young teen did so, still floating an inch above the floor and glancing around like a kid in a candy store. Flash and GL led the way into the conference room used by the founding members and they all took their seats as Superboy continued his examination of their surroundings.

"You guys need to put a coffee machine in here," Kon stated casually. "Where I'm from there's a coffee machine in here… it helps with the tension, and the grumpiness." He tossed a smug look towards Batman as he said this, though his sunglasses hid this from all without x-ray vision or the like.

"Just sit down and explain," Batman interrupted the still hovering teen's musing yet again, this time glaring harshly at him.

"You really need to chill." The Teen of Steel muttered, floating over the table to take the empty seat next to the Flash.

"Is your Batman as grumpy as this?" Flash asked softly, hoping the Bat wouldn't hear but at the same time wanting him to just to be annoying.

"No, actually I think he's a bit worse." Flash shuddered as Superman and Wonder Woman tried to hide their smiles. Batman growled. "Ok, ok." Conner relented, "What exactly do you want to know? I'm not so great with science, or history or anything like that – I leave those things to Robbie mostly."

"Robbie?"

"Yeah, he's probably my best friend, though Bart's great too. Robin's our leader and stuff…" Superboy pulled off his sunglasses and gave Clark a confused look. "Is there no Robin here either?"

"There is," Clark stated smoothly, "but what do you mean by 'either'?"

"Well obviously I don't exist, or you'd have said 'Conner what were you guys doing interfering in Justice League business?' (which by the way was not our fault) instead of what you did ask."

"I'm surprised you even noticed that." Batman muttered under his breath.

"Hey," Kon exclaimed pointing to his ears, "super hearing ain't broken, ya know. I don't know how Rob puts up with you."

Batman opened his mouth to speak but J'onn beat him to it. "This is getting us no where. Superboy, please, tell us how you came to be here so that we might get you returned to your world."

"Can't you just read my mind and figure it out?" Kon asked in an annoyed tone.

"I cannot. I believe that because of the differences between our world's signatures your mind is not… compatible with my psychic probes."

"Oh," Kon stated simply, "Well, I have no clue, as I said – not so good with that kind of stuff. You'd be best to ask Rob… even Cassie or Bart would have a better idea then me. I'm just the heavy muscle, and hot bod, of Young Justice. I leave the thinking to Robin and the others."

"Apparently," Batman stated, earning him a glare from the Teen of Steel. Batman continued, nonplused, "But unfortunately they are not here, you however are."

"They're around somewhere though; they were at the battle scene too."

"What?" Superman leapt to his feet.

"Yeah. Imp went down, probably by whatever brought us here, so Cassie and Rob were digging him out while I provide air cover. He figured out the whole alternate dimension thing right before the comms went down and you guys dragged me here."

"Arrow, do you copy?" Superman asked opening a communication channel with the team still on the ground.

"I'll head down to coordinate things," Batman stated standing.

"Good idea Batman," the Man of Steel stated offhandedly, "If Robin's in charge of these kids then he'd probably respond best to you anyway."

"I shall accompany you with the search." J'onn added in.

Superman nodded at the two, returning to the still open communication channel, "Arrow? Batman and the Manhunter are coming down to pick up a group of kids caught in the blast… No, Robin and some others who were with our guest… Alright… Superman, out." The two veteran superheroes nodded to each other, then without a second glance the Caped Crusader exited the meeting room with the green Martian a step behind.

Superman returned his attention to his young protégé. "What else can you tell us about your world? How you got here?" he questioned.

"Er… well… I don't really know how we got here… I didn't even know there was a here until Robbie explained it to me…"

"Alright, so we'll have to wait for Batman's return – hopefully with Robin in tow… Who are these others you've mentioned?" Clark sighed.

"Who? Bart and Cassie? They don't exist here either?" Conner was genuinely surprised by that. It was understandable that he wasn't in existence as it was a miracle his cloning hadn't resulted in his death already – but Cassie and Bart should have been here. Maybe this world was more different than even Robin had thought. Wait… Robin…

"Robin exists here though, right?"

Wonder Woman nodded, "I met him myself not too long ago."

"And so does his brother – the old Robin?"

"Old Robin?" GL blinked in surprise.

Conner was looking at Superman though and didn't catch the surprised look on the other man's face. The Man of Steel gave the teen a thoughtful look before sighing and answering almost sadly, "You're talking about Nightwing, right?"

Conner sagged in relief, "Yeah, Robbie's big bro… good, I was afraid that maybe we'd like gone back in time or something and just weren't around yet… 'Cause really Bart should have shown up at least… I might not have ever even been created, and Cassie might not have gotten her powers here… yet at least… but Bart would have died if he wasn't…"

"Whoa, whoa… Hold on a second… Back up – who are Bart and Cassie already? Are they super-kids like you and Robin?" the Flash interrupted.

"Rob's not a super kid… a super genius maybe…"

"Don't mention that to any of the Bat-clan though. They'd kick your ass for even thinking they weren't on par with the rest of us…" John stated with a smirk.

Conner smiled back at him, "Dude, they might not have super powers, but with out them the League wouldn't be able to function – and the Titans and YJ wouldn't even exist."

"Titans?" Wally asked, intrigued.

Conner's head whipped around in shock, his mouth dropping open as he stared at the Flash. "You… The Teen Titans never existed either?" Wally gave the boy a questioning look and shook his head.

"Never heard of them if they do."

"Holy crap!" Kon replied, dumbstruck.

"Watch your mouth," Clark replied without a thought. Kon turned and blinked at him, blushing slightly and mumbling an apology.

"The Titans were like the greatest. They're the ones who deal with all the little problems the League can't get to. You," he pointed to the Flash, "are supposed to be a founding member… Wait… you are Wally, right?" It was now Wally's turn to gape in shock. GL just laughed at him. "And who are you anyway?" This question made John stop as the teen was looking straight at him as he asked.

"I thought you knew who the Green Lantern is?"

"I know Kyle, but not you… Wait… Clark mentioned a Hal Jordan once…"

John frowned at the mention of that name, "No, kid, I'm not Hal. The name's Stewart, John Stewart."

Kon nodded in recognition, "Yeah, I remember now. One of the Lanterns before Kyle… I think you spent most of your time on Oa in our world though…"

GL's frown deepened, "Kyle… That's Kyle Rayner right?" Superboy nodded. "He's on Oa right now, has been for years…"

Conner shrugged, "Well on our world he's the main Green Lantern for our sector of space. I know you're around too – but we've never met I don't think."

"So tell me more about these 'Titans'," Wally begged, his natural curiosity overcoming his earlier shock.

"Oh they're pretty cool… for an older group at least. Not active so much anymore. Arsenal runs with them a lot, but Cyborg, Changeling and Raven mostly run things… Nightwing was their leader until… well…" Conner shifted uncomfortably, "maybe I shouldn't say anymore until Robin tells me to…"

Wally smirked at the teen, "Do you always listen to what Robin tells you?"

"No," Kon replied indignantly, "Barely ever. He's not so great, I could be leader if I wanted to!"

Wally went to reply but was cut off by an irate Green Lantern, "Wait wait! You keep throwing all these names at us kid and we," John glanced around quickly, "Well *I* have no idea who any of these people are."

"There's a good chance we shouldn't know," Superman cut in, "We haven't yet figured out if these kids are from the future or not."

Lantern sighed heavily, "That may be true but we should at least get the basic details of those who may actually *be* here – I mean if we can't find Robin, or he's hurt the guys on the ground need to know who to look out for at the least."

"Oh," Diana exclaimed, "Of course, we should have thought of that before sending Batman and J'onn off…"

"We can just radio him the information. So… Superboy… what *can* you tell us about your friends?" Clark asked.

"Um… you mean like the basic stuff – name rank and serial number and all that stuff?"

Superman gave him a lopsided grin, "Yeah, all that stuff."

Kon dropped himself into one of the chairs at the table and kicked his feet up as his brow creased in thought. "Well there's Cassie, hot, short blonde hair, responds to the name Wonder Girl."

"*Wonder Girl*!" Diana interrupted incredulously.

"Yeah," Conner blinked at the response. "The old one died… though I think she's back now… don't know if that's happened yet but whatever… She got her powers from the head honcho of the Greek gods… erm… whats-his-name…"

"Zeus?" Wonder Woman provided airily.

"Yeah! That's him. She's cool – our public spokesman and all that stuff."

"So blonde girl with Diana's powers – check, who else?" Wally asked impatiently.

"Well there's Bart…" Kon turned a serious eye to Wally, "If you haven't met him than I *really* hope that we're back in time cause that'd really suck..."

Wally's face turned deathly white at the boy's serious tone and words. "I know… Wait… No… Bart…" he swallowed heavily, "You mean Bart Allen… don't you…"

Superboy's face lit up, "Yeah, good! That means he's ok!"

"Who's Bart Allen?" GL asked his friend.

Flash's face fell even further, "I don't want to talk about it."

Kon paled at those words, "He's not… Bart's not *dead* is he?"

"I said I don't want to talk about it!" Flash spat and disappeared out the door without another word.

Superman, Wonder Woman, and Green Lantern stared after their normally cheerful and laid back friend in shock. "I think we *really* need to know what's going on around here…" GL muttered in shock.

"Dude, this is so not cool anymore…" Conner announced, returning the remaining Leaguer's attention back to him.

"I don't care if you're from the future anymore, tell me everything." Clark's voice was commanding in a way that had Kon reacting without conscious thought and began to tell his story.

"Well, Young Justice is made up of all of us sidekicks and such – there's me, Superboy; Cassie, who goes by Wonder Girl; Robin, the mini-Bat; Bart aka Impulse; and this weird chick named Secret – her name's a secret." GL rolled his eyes at the teen's stating of the obvious.

Kon ignored the League members' looks as he glanced around for something to occupy him as he spoke. Seeing nothing better than a spare paperclip on the table in from of him, he picked it up and began to bend and twist its shape as he absently ran it over the tips of his fingers.

"Cissie was around for a while too, but-"

"What the hell is that?" John interrupted, staring at the paperclip, now in the shape of a sword, balanced on the tip of the teen's pinky finger.

Superboy grinned brightly at this unknowing audience, "That's my super ability! My tact-"

"*Don't* let him get started, he'll never stop," a disheveled Robin interrupted from the doorway.

"Robbie!" Kon flew (literally) from his seat. "Dude, you look like crap!"

Robin glared at his fellow YJ member. "How astute Kon."

"Just sit down," Batman graveled from behind the two teens, cutting off what he was sure to be Superboy's next inane question – "What's astute mean?"

"Where's Bart and Cass?" Superboy finally asked as he floated over the back of the chair he had recently vacated, and landed soundlessly.

Robin sighed as he collapsed into the nearest empty chair, "Bart's zooming around the place getting the lay of the land, unless he got distracted by something he should be done right about-"

"HERE!" the tell-tale scream and rush of wind announced the presence of the (arguably) youngest of the Young Justice members. Like Robin, Impulse's uniform was dusty and disheveled and he had dried blood trailing from a closed cut on his forehead, but he was grinning in his usual manic way, which Kon took to indicate that he was physically and mentally fine.

"Cassie," Robin continued without batting an eye, "Is being checked out in the med bay – she got knocked out by some falling rubble."

Conner jerked at that "*Cassie* did…"

"She was helping me dig out Bart when a building fell on us… I couldn't get us out in time, so she shielded us until Bart woke up." Robin blushed slightly.

"Manhunter will take care of her, don't worry." Superman reassured the young heroes.

"Can I go see her?" Kon asked.

Clark tried to hide his knowing grin as he replied, "Sure Conner, I'll-"

"I can take 'im, I know where it is!" Bart interjected before grabbing Superboy by the arm and disappearing from the room.

"And I thought Flash was hyperactive," GL stated, slightly dumbstruck by the boy.

"Yeah, Imp literally starts vibrating if you try to make him stay still too long," Robin sighed in exhaustion, before asking, "Where is Flash anyway? I thought he was here?"

"Bolted when the kid started questioning him about this world's version of your hyper speedster…" GL pondered Wally's reaction to Bart's name, waiting to see if Robin would be forthcoming with more information about the boy.

Tim flinched at the implication, but simply replied, "Wally and Bart aren't very close where we come from… Bart's a lot to handle and Wally never had the patience to deal with him. Their fights can get pretty intense." The League members seemed to take his comments at face value, but he still quickly changed the subject just to make sure, "In any case, can I get us some showers and food? I know I'm pretty beat from this crossing-dimension travelling thing."

Batman gave his alternate protégé a hard look, suspecting the boy was up to something, but Superman and Wonder Woman hastily agreed to the idea and ushered the young hero-in-training to meet up with his comrades, postponing their questioning of the teens for a few hours at least.