AN: Kept you waiting, huh? After originally deleting the Fantastic Four from the climax of last chapter due to not giving them any dialogue, this is where I now shall introduce the First Family to the story. Well then, let's finally hop to it!

Steven Universe: The Fantastic Mutants

Chapter 2: Right into the Danger Room

"Here we are Steven, the X-Men's personal training room." Pearl announced as the group exited the elevator, went through the hallways, and stepped into the famous Danger Room of the X-Men. Aside from the small control room above it housing X-Men ally Moira MacTaggert & Gold Team member Doug Ramsey aka Cypher, the area was a large white room decorated with turrets, holograms, and various other traps designed to test whoever trains in there.

"So, the legendary Steven Universe in the flesh." Reed Richards announced his presence by appearing behind Steven with Susan Storm, Johnny Storm and Ben Grimm behind him. "Wait, the Fantastic Four are here too?!" Steven exclaimed. "That's right little guy. The professor and Stretch here actually wanted to test you." the Thing stated patting a big orange hand on the stretchable scientist's shoulder. "We've already heard about how you helped those Chitauri and Thanos."

"Charles is already sort of familiar with you Gems thanks to your mother." Sue added with a wink. "Which version of my mom are you talking about, Rose or Pink Diamond?" Steven asked, casually bringing up his mother's true identity to the four, which incited an awkward silence.

"Okay then." Johnny muttered nervously. "Why don't we just get to fighting already to get our minds off that junk?" he asked. "Very glad you asked Johnny." Reed answered just as sheepish while gazing down at the Danger Room. "Eight Crystal Gems against twenty-four mutants, Johnny and Ben. Sounds like pretty bad odds for you."

"We'll find a way around that." Garnet declared as she pounded her fists together. "Now then, shall we begin?"

"Gladly." Wolverine smirked and he popped out his claws and the two teams of both eight & twenty-six were lowered down into the training room. Charles, Reed and Susan remained in the control room to monitor the Gems' abilities from afar. "Let the testing begin." Xavier declared.

"Heads up X-Men!" Cyclops exclaimed firing his eye beams at Garnet, who swiftly blocked them with a cross of her arms. "Joke's on you, my future vision saw that coming." the fusion smirked before she went in for the kill, punching the mutant in the face.

"So what can you do little one?" Colossus asked while towering over both Peridot and Lapis. "That depends. How heavy are you with that form?" Peridot replied with a grin as she lifted the metal man into the air with her ferrokinesis. "My word, I am floating!" Piotr cried in astonishment. "C'mon Lapis!" Peridot muttered to the water Gem. "Go and make him wet! He should rust, right?"

"Oh uh, I don't think I can do that right now." Lapis said nervously before slowly shuffling away, inciting curiosity from the green Gem. "That's a little odd." Peridot observed while lowering Colossus to the ground. "Yes, you say she has water powers yet has not used them at all." Piotr added. "And by the way, I do not rust."

Meanwhile, Pearl and Connie were clashing their blades with Wolverine and Laura's claws. "Likin' the new sword Connie." Logan complimented. "But what the hell happened to the old one?"

"Oh, funny story actually." Connie stated while parrying Laura's foot claws. "Ruby and Sapphire had this wedding that we put together after we all learned Rose Quartz was Pink Diamond in disguise only for it to be crashed by the Diamonds and Blue Diamond broke the first one. Then we went to Homeworld where Bismuth eventually came to help us with a new one she made for me."

"That's certainly a lot to take in." X-23 remarked while flipping backwards to avoid Connie's attacks before she locked the claws in her hands with Pearl's spear. "Yes, everything after that did take some getting used to." the white Gem stated. "Between repairing the beach house, making a place for all the Gems we uncorrupted to live in and still sort of recovering from becoming extensions of White Diamond, it's a lot to take in."

"At home base is our golden boy Sammy "The Cannonball" Guthrie, as he gets ready for perhaps the biggest hit of the season!" Cannonball narrated to himself like a sports commentator while aiming himself at Bismuth, who was duking it out with both Ben and Johnny. "To say he's been preparing for this moment the entire year wouldn't be saying much, but by God he plans on making this the hit that'll change the way everyone sees his team for centuries to come!"

"Hey Cannie, quit stalling!" Magma jeered as she made small talk with Nephrite. "Not even his fans will break his concentration!" Sam continued and then, he began to ignite his feet. "HERE COMES THE PITCH!" he yelled, blazing towards the blacksmith, the Torch and the Thing with rapid speed & a big grin on his face and then, knocked them all down like bowling pins. "AND THE CROWD GOES WILD!"

"Sam you nino." Amara tutted to herself. "Is your relationship normally like this?" Nephrite asked the lava mutant. "Yeah, he's kinda like an annoying little brother to me." Magma replied. "So anyway, what can you do?"

"Oh, you mean you want to see my weapon?" the former Centipeetle mother inquired. "Well, here g-" Before she could demonstrate, Cannonball was sent flying into a wall by a single punch from Garnet, right next to the two. "I'M OKAY!" he exclaimed. "NAILED IT!"

Far from the others, Steven was backed into a corner by Blink and Warpath. "Gotta say kid, you're not too shabby." Clarice Ferguson nodded while flinging her crystal javelins at Steven's shield. "You still got a little to learn, but that's what the professor is for."

"Oh yeah? Well try this!" Steven exclaimed, now turning his shield into a bubble to roll around in and raced off, knocking down Clarice and James along the way. "There is so much about Gems that we must learn." Warpath muttered. "Don't you agree Clarice?"

"Hey Connie, over here!" Steven called out to his human friend. "Let's show everyone something really cool!" he offered. "Oh, you mean-" Connie began when Logan cut her off. "I'm sorry, what?" Wolverine asked as the girl raced to the bubble and high-fived each other, glowing brightly inside the sphere before it dispersed, and out of it came Stevonnie. "TA-DA!"

"What the hell just happened?!" Cypher exclaimed in wonder. "Anyone else seeing this?" Moira asked the others, who were already monitoring the current events. "It seems they have merged into a singular being!" Reed analyzed through video footage of the fusion before speaking into an intercom. "Excuse me new fighter. Can you please tell everyone in the room who you are?"

"We already know Richards." Garnet stated. "Meet Stevonnie, a fusion of well, Steven and Connie." she introduced the kids' fusion before they cut her off. "Let me take over Garnet." Stevonnie suggested. "In case you couldn't tell, a fusion combines multiple aspects of its fusees, like appearances for example." they explained. "And abilities too. Like so."

To demonstrate, they summoned Steven's shield following by swinging Connie's sword about. "So in short, you're basically two cute kids standin' on top of each other to form a non-binary lookin' person?" the Thing remarked. "Whatta strange development!"

"Fusion? Interesting." Lapis muttered to herself with her back turned to Peridot. "Uh, why would you say that Lapis? You know you've had bad experiences with fusion!" the green Gem asked. "Do you mind little one?! I'm trying to think!" the taller Gem shouted harshly, giving Peridot a fright. "Something just isn't right! Who are you?!"

"We shall focus on your friend later child." Colossus stated as he picked Peridot up and walked away with her, leaving Lapis alone. "I assume you are very close?" he asked. "Indeed we are." Peridot remarked. "We've had our conflicts in the past, but overall we're very good friends or maybe something more. But still, she never called me little one before and hasn't acted like that since we were first getting to know each other."

"You are correct. Something must be wrong." Piotr agreed. "I suggest we keep our heads down and see what happens."

As for Stevonnie, they had just finished going a few rounds with both Cyclops and Jean before finding themselves getting tired out. "Okay, let's take five for a bit. I'm beat." they announced, officially splitting back into Steven and Connie. "You two work very well together." Scott remarked as he helped the kids up. "Are there any more fusions we should know about?"

"Well, there's Ruby and Sapphire for example." Wolverine stated, cuing Garnet to split up into the married Gems. Ruby's headband was now a shiny orange color, she now wore brown pants and the top part of her torso was the same color. Sapphire's dress was currently covered by a light blue vest with navy lining underneath a white top with much pointier sleeves than before.

"AAAWWW! Aren't you two just the cutest?!" Cannonball squealed at the sight of the two. "You're right, these funky little lesbians are just so small!" Kitty exclaimed. "Oh you're too kind." Sapphire giggled and blushed. "Anything else we should show you?"

"Yeah, you got any more fusions?" Laura asked. Without any hesitation, Ruby, Sapphire & Steven merged into a new fusion that looked like a giant sun wearing sunglasses. "Sunstone is in the house baby!" Sunstone proudly announced, following up by offering everyone a high five. "How has everyone been doing lately?!"

"T-this can't be real, can it?" Cyclops gasped at the friendly fusion. "Don't be so alarmed buddy." Sunstone exclaimed. "It's always nice to meet new people. But if those new people do anything to make you uncomfortable, that's NO GOOD!"

"Why are you talking to the wall?" Beast asked Sunstone after they had given an important life lesson to seemingly nothing in particular. "No matter. Could you perhaps show us your abilities?"

"With pleasure sir." Sunstone accepted the offer and made a pair of suction cups appear, using them to climb up the wall. "And another thing, don't forget to respect your elders!" they added. "Oh god, this new one is just like Wade." Wolverine face-palmed. "Who's Wade?" Bismuth asked, to which she was met with a terse "You don't wanna know bub!"

Meanwhile in the mansion above, classes had finally got out and the students of the X-Men were ready to call it a day. "How come none of us have ever heard of these Gem creatures before?" Hisako Ichiki asked her friends. "Which one do you think is your favorite? I think mine's the big one with the rainbow hair." Megan Gwynn also inquired. "I find the little green one very funny." Sooraya Qadir answered. "And so cute to-"

Suddenly, a loud knock came from a nearby closet. "Anyone else hear that?" Dust exclaimed. The knocking sounded again. "It's coming from over there!" The three mutant girls proceeded to investigate, opening the closet to find a blue-skinned woman tied up and gagged. "Is that one of them?" Armor shouted as she freed the girl from her restraints, and she only had one question. "Where's Peridot?"

"Are you talking about the tiny one Sooraya said was her favorite?" Pixie wondered. "Last I checked, she went with our teachers to the Danger Room." Faster than the three mutants could see, Lapis zoomed off to the training room. "Please tell Peridot I find her hilarious!" Dust called after the water Gem, but her words barely reached her.

"Okay, I do believe we've seen enough!" Xavier called to Sunstone from the viewing box. "Don't want anyone to get crushed if you fall!"

"You got any pyrotechnic abilities Sunstone?!" Johnny exclaimed. "If you do, then I think we might have a little competition!" Sunstone was quick to correct the Human Torch however. "I do believe I haven't tried that out yet." they remarked, then they made the suction cups disappear from their hands and landed on the floor with extreme bravado. "Thank you, thank you very much!"

"Ugh, showboat. You kinda remind me of another fireman." the Lapis Lazuli that Peridot believed might not be the one she remembers snarked. "Am I the only one who's noticing how different Lapis is?!" Peridot exclaimed. "I haven't seen you act like this since we first moved in together! What gives?"

"I'm just not impressed, that's all." Lapis growled. "Something tells me we got a spy around here." Mr. Fantastic announced as he, Susan, Xavier, Moira and Doug entered the Danger Room. "Tell me Ms. Lazuli, what can you tell us about the disappearance of the ocean a while back?"

"Oh well, they just vanished. That's all." Lapis answered while fidgeting with her hands. "I know a liar when I see one!" Ben growled. "And by my great aunt Petunia, you definitely look like a liar!"

"That's because she is!" another Lapis exclaimed racing into the Danger Room and scowling at her double. "So, what thinks you can snatch me out of that elevator and take my place?!" she argued. "Who are you talking about? I am the real deal!" the other Lapis stated flamboyantly. "Loyal member of the Crystal Gems and this little Peridot's dearly beloved!"

"Oh yeah, well which one of you likes this?" Steven declared before he began making fart noises with his mouth, causing the first Lapis to laugh and the second to smack her face in embarrassment. "What an absolute child." she groaned. "AHA!" Peridot cried. "Now we know who the real one is!"

"I AM!" the pair of Lapises exclaimed in unison. "Oh please Mystique, you can use your powers better than this." Xavier tutted disdainfully. "It's almost like you're passing yourself off as incompetent to annoy us."

"Of course it had to be you to expose me." the second Lapis growled as she began to change form. Unlike Gem shapeshifting, she didn't glow as her eyes turned an empty yellow, her hair was dyed red, scales appeared on her face & arms and Lapis's clothing was replaced with a white leotard that came with matching boots, gloves and a shawl kept together with a skull. She was no longer Lapis Lazuli, but instead her true identity as the shapeshifter Mystique. "Frankly, we knew this part of our plan wouldn't end well."

"We?" Steven asked, but the X-Men knew exactly who she was talking about. "The Brotherhood!" Iceman shouted when the alarms sounded. "Oh hey, speak of the devil." he muttered bemusedly. "No offense Kurt."

"No time to talk, we must go now!" Nightcrawler commanded while Mystique made a break for it. "You are exactly right Wagner." Scott declared. "X-Men, let's move out!"

Where the proud front doors to Xavier's school once stood, now there was only a hole created by a massive man dressed in red, most notably a large helmet covering his entire head. "Okay ya walkin' talkin' rock candy, where are you?!" Cain Marko, better known as the Juggernaut, roared. "It's a good thing Mystique planted that hearing bug on herself just in case." his amphibious partner Toad added. "I just can't wait to see those pebbles for real!"

"Hello boys." Mystique greeted her fellow mutants as she stepped out of the shadows. "I suppose you may have already gotten the news." she said. "Well I got worse news: they're after me." And Raven was right. The Crystal Gems came charging after the mutant and took up arms against the two new mutants. "And you two are?" Garnet asked.

"Pardon me for being so rude." Juggernaut stated. "You can call me the Juggernaut, bitch!" he roared. "And we're all from the Brotherhood of Mutants, here for that brat with the shield!"

"Let me guess, is this about my mom?" Steven asked, exasperated how most of his enemies come after him because of Rose Quartz. "No, we don't care about her! The master only wants you!" Mortimer hissed. "Now just come quietly and none of your rainbow friends will get hurt."

"No dice Kermit!" Amethyst shouted. "Steven, keep yourself away from these guys and get everyone to safety! The OG-3 got this handled!" she ordered the boy. "Right!" Steven accepted. "X-Men, I need you to help me find the students!"

As Steven led the mutants and the Fantastic Four away; Garnet, Amethyst & Pearl charged at Juggernaut, Toad & Mystique with weapons ready. "Do you wish to know the qualities of the mighty toad?!" Mortimer bragged as his long tongue tangled with Amethyst's whip. "Wait wait, I think I got this!" Amethyst exclaimed. "This can happen to them."

Suddenly, Amethyst tossed Toynbee around by her whip, still tangled with his tongue, and smashed him into the ground multiple times. "Okay!" Mortimer declared, getting more desperate with each pound. "I surrender! Same thing that happens to everyone else! Make it stop! I'm gonna be sick!"

"What business do you have coming here following us and replacing Lapis?" Pearl asked as her spear clashed against Mystique's knife. "We are simply in league with someone who wants that child's gemstone." Mystique replied. "He desires it for experimental purposes."

"If you think you can take Steven from us, then you got another thing coming!" Pearl howled protectively.

"Okay, that should be all the students." Cyclops announced while doing a headcount of the school's student body. "I swear, we should really increase defenses at some point and maybe build a stronger building."

"But I on the other hand believe the school being damaged builds character." Colossus responded. "So what can we do now guys?" Steven asked his fellow mutants. "I mean, is there any way we can just reason with these villains and make them leave the place?"

"Don't you go thinking some cutie pie words will just make us surrender pink brat!" a new mutant declared emerging from the dust & rubble. He looked very similar to Wolverine, but looked more feral with blank white eyes, crazy blonde hair and a red & brown costume. Beside him was a pale Japanese woman dressed in tight black leather that had an Oriental style to it. Also like Logan, they both had metal claws emerging from their hands.

"Creed. Oyama." Logan snarled at Sabretooth and Lady Deathstrike. "Looks like we almost got the whole Brotherhood here." Emma Frost implied. And just as she said so, a morbidly obese man in a blue singlet came rolling in using his fat body. "HOWDY TRAITOR!" the Blob shrieked. "And lookie here, we got us a good one!"

"Why don't you just hand over the boy and no one will have to get hurt?" a pyrokinetic mutant offered while standing alongside another member of the Brotherhood in steel blue armor who was causing the school to slowly fall apart. "Naw just kidding to be honest, someone is probably gonna get hurt no matter which side they're on!"

"Don't get too cocky John." the Brotherhood's earth-moving tactician Avalanche coldly reminded Pyro. "Now where could Tom be?"

"Right here gang! And guess who I found?" the plant controlling Black Tom Cassidy announced while having assisted Juggernaut, Toad & Mystique in detaining Garnet, Amethyst & Pearl with his vines. "Seriously, who are you crazy people?!" Lapis exclaimed in fright at just how one man was able to defeat three powerful Gems. "They're the Brotherhood of Mutants, a group of extremists dedicated to more violent ways of mutant peace." Jubilee exposited. "And by the way, what do you want now?!"

"They want Steven! I don't know why exactly, but they're working for someone who wants him for science junk!" Amethyst cried out. "That's not untrue runt." the Brotherhood's leader Magneto concurred while descending from the sky in a sphere of purple energy. "I do apologize for making this much of a scene but I implore you all, give us the child and you'll go free."

"You shall do no such thing Erik." Xavier boldly rebuked the master of magnetism. "Just who are you in alliance with?"

"Well, it should be someone quite familiar to some other guests of yours." Magneto answered while looking at Reed and company, who knew exactly who he was talking about. "Doom." Richards muttered in shock.

As the invasion of the mansion went on, a man dressed in green robes and silver armor watched everything play out through a holographic screen in his castle in the nation of Latveria. Its literally iron-fisted ruler Victor von Doom slouched in his throne as he watched the Brotherhood of Mutants contend with the Crystal Gems and their new allies before he got up and walked towards the screen. With a devilish grin that couldn't be seen through his emotionless mask, he traced a circle around Steven and let out a menacing laugh. "Soon child, your gemstone shall belong to Doom."

At long last, chapter two is done! Yeah, tons of things got in the way of its creation like my bad habit of unintentional procrastinating along with a certain virus that's been ruining everyone's fun lately. But on the bright side, I've been able to get this out long after the grand conclusion of Steven Universe Future, so I'd have a lot to work with for future stories. But for now, stay safe out there in these trying times and stay tuned.