In Steven Universe's world, it has been two months since Steven Universe managed to talk sense into the Diamond Authority and return to Earth to fix the Corruption. But during those two months...weird things were happening in Steven's life.
To start off, Garnet found out and vowed to protect a green, glowing stone that radiated not only with power, but with a endless sense of control over time. Since none of the Crystal Gems truly knew what this thing did, it was simply stored inside one of Garnet's gems, so it could be kept safe until she fully learnt what it was. Then, some of the Crystal Gems began to disappear left and right, claiming to be going somewhere. The Crystal Gems left on Beach City, Garnet, Amethyst and Steven, were already doing everything they could to track them down, only for no results.
"Do you think we'll ever find them here?", Steven asked in the current day, very worried for his friends/caretakers.
"Not on Beach City.", Garnet stated.
"And we didn't find them neither on other places.", Amethyst pointed out.
"I mean- here. On Earth.", Steven explained. "Maybe they could be on another planet, or another universe!...if that's something possible."
"That sounds crazy!", Amethyst laughed before getting a pondering face. "...but kinda makes sense."
"So where they could-"
"Someone's going to visit us.", Garnet stated after adjusting her glasses and using her future sight, interrupting Steven. Before questions could be asked, Steven and Amethyst got startled when a portal opened in-front of Steven's house.
As they ran outside to check what was going on, they found out two people remaining on the very other side of the portal: one was a teenager girl, with blonde hair, blue eyes and heart blushes on her cheeks. The other one was a adult woman with pale skin, poofy teal hair, mauve eyes, and red spade marks on her cheeks.
"I'm Queen Eclipsa and this is Star Butterfly.", the woman presented herself and the teenager. "You need to come with us."
"Sorry for startling you guys, but really, more than one world is at danger.", Star Butterfly stated.
After Steven and Amethyst got over their initial shock over meeting the two females, Garnet just said one order to them. "You two will watch out for danger outside whenever we are going."
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"Before the first universe in the multiverse existed, there was nothing. So, six stones flied over the multiverse once it began. Each of those..."Infinity Stones"...controls a part of existence.", Eclipsa explained, showing a magic vision from the Infinity Stones, six stones with the colors blue, red, purple, orange, yellow and green. "Blue is Space, red is Reality, purple is Power, orange is Soul, yellow is Mind, and green is Time."
Garnet remembered of the green stone she found during the last two months, and decided to show it through her triangle-facet gem. "This one. Right?"
"Yes.", Eclipsa agreed. "But I'd keep it if I were you."
"Hey?", Star Butterfly said. "Tell me this guy's name again."
"Zalgo.", NiGHTS said, kind of distracted over her grief, before getting a grim look of determination on her face. "I didn't meet him until now, but I can tell how much of a monster he is. I- I mean we...gotta stop him."
"I mean, we didn't vote to be part of it, but Mewni and the monster are in risk.", Star Butterfly stated.
"So, it's your job.", NiGHTS guessed, before turning her head to Garnet's direction. "So, what are those "Crystal Gem"'s job, besides...having a double-married leader?"
"...protecting the Earth. Beetlehead.", Garnet snarked, but in her normally stoic voice.
"Okay, can we cease this goose now?!", Star said, interrupting a argument from happening between the jester and the gem. "He already got two stones (already making him the strongest of all beings), and he'll only get worse! We got one stone and we must find and protect the easiest stone."
Before anything else could be said, a gust of wind was heard outside, and NiGHTS looked out to find...something, incoming. The quartet quickly ran outside through the staircases, ready to fend off the threat.
Meanwhile, the half-gem boy's pink gem on his belly glowed, making him gasp of surprise before he could face his left, discovering about the ship ready to invade the place. Seeing Amethyst was threatening to sleep, and the other human boy that lived on the "Monster Temple", Marco Diaz, was distracted, he enacted a plan to sneak in the incoming fight. To kick it off, he ran to Marco and tapped his arm to catch his attention.
"We need a distraction, fast!", Steven said, pointing at the donut-shaped ship outside.
Marco seemed to silently (and non-questioningly) agree with the plan, since he began to yell to the other beings they all were gonna die, and to look at the spaceship outside. The turmoil was big enough to wake Amethyst up, but not before Steven could summon his shield and glide with it through the Monster Temple's external part, in the other direction of the quartet.
As NiGHTS, Eclipsa, Star Butterfly and Garnet tried to reach the ship, it was too late; it already was safely stationed, and it beamed out two beings. One was Wizeman, bitterly recognized by NiGHTS. The other, a green-haired and mean-looking cat girl, was unknown to all four of them.
"Listen to me, my creation. Listen to me, strangers.", Wizeman began to repeat the same monologue from before. "You have the honor of being helped by the one who Waits Behind the Wall, the Hivemind of Chaos, Zalgo. This is not pain like you all might be-"
"I'm sorry, Mewni...?, is closed, today. You should leave us all alone!", NiGHTS said in a sassy way cutting off her former master, only slipping when mentioning the world she was apparently in.
"I should've seen it.", Wizeman non-chalantly said. "The apparent keeper of the Stone being protected by my pitful creation."
"I can protect myself with very ease.", Garnet stated, as she summoned a pair of gauntlet gloves on her hands.
"And there's no way you'll leave this Kingdom full-handed!", Star stated, as Eclipsa pulled out the royal wand, shaped like a parasol.
"They mean "get lost, puppet master"!", NiGHTS fiercely yelled.
"You all are getting annoying enough.", the cat-girl, Uramiko, yelled, before blasting something onto Star's chest. NiGHTS and Eclipsa expressed worry for the blonde as she felt on the ground.
"I'm fine...really...", Star stated, as she got up. "We'll show them what we're made of!", Star stated, as she began to focus to try something...sure, her hair was getting a bit long and seemingly tied, but it didn't go further beyond that. "I just...need more focus."
"For what? There's no time for this thing.", NiGHTS stated, pointing at the approaching Uramiko. "That's the thing right there, let's go."
Despite struggling, Star was somehow not being able to achieve her Mewberty form. She was just getting close to making her tiny wings get slightly bigger, and make her hair a bit longer than normal, and kind of tied.
"...you'e embarassing me in front of the gem.", NiGHTS said, pointing her thumb at Garnet, who looked at her and Star Butterfly awkwardly.
"I...don't know what's wrong with me here...", Star Butterfly stated, looking at her chest. She couldn't put her finger on it, but she could feel something made out of metal stuck on her torso.
"Don't worry.", NiGHTS said, with a confident smile. "I got this."
NiGHTS floated to face off Uramiko, who tried to blast her with a pea shooter. She made a acrobat stunt to avoid the bullet and counter-attacked by spinning like a drill and hitting Uramiko with all the impact she had. Wizeman simply pushed Uramiko away with one of his detached hands before she could knock him off, making her hit a metal cage she left behind and free a tiny, confused rabbit girl with a weird umbrella.
Wizeman's move was summon many giant-sized snowballs and throw them at the quartet like crazy. NiGHTS struggled to fly through them, but Eclipsa blasted most of them with a "Midnight Shriek". Before NiGHTS could try and attack the Wicked, Uramiko came back, beaming NiGHTS far into a rock mountain, making Star run after her.
"Hey, are you fine?", Star asked, crouching down to face the laid down NiGHTS.
"Very, very very fine.", NiGHTS said. "Wanna help?"
Before Star Butterfly could properly reply, Uramiko came, forcing Star to try and use one of her favorite attack spells, Narwhal Blast. Uramiko transformed the blaster on her arm into a shield, reflecting the blast in a wall and making a rock fall. NiGHTS avoided it, but Star Butterfly was harshly crushed by the rock.
"Come on...what's happening with me? Come on, come on, come on!", Star Butterfly yelled, as she tried to focus on transforming into her Mewberty form. It worked to the point the colors of her dress turned into the ones of the Mewberty's form dress, but just that exhausted her enough to the blink of collapsing her body on the ground.
Uramiko, with NiGHTS at her mercy, was about to send a final shoot to finish NiGHTS' race off. However, before it could hit her, it suddenly stopped in a cloud of dust and smoke. It cleaned off to reveal the rabbit from before, Cream, and Steven Universe, with a larger version of his shield summoned.
"Uh, hi, you two!", Cream awkwardly greeted both Uramiko and NiGHTS.
"Where did you two come from?!", NiGHTS asked, shocked over the two uncommon children.
"The temple and the rocks-", Steven tried to explain before having his shield picked up by a hook and thrown off, leaving Cream and NiGHTS exposed. While Cream activated the hook of her umbrella to hang herself on a safe rock, NiGHTS summoned a blue diamond that threw a beam at Uramiko.
"What's wrong with her, miss?", Cream fearfully asked.
"She's from I-don't-know-where.", NiGHTS answered. "She came here to steal a powerful stone from a magic stone lady."
As NiGHTS kept commanding her blue diamond to shut off beams, and Steven and Cream reunited, Garnet felt right next to them.
"That's the magic stone lady!", NiGHTS pointed out to both Steven and Cream.
"Don't worry, Garnet!", Steven ran in to his caretaker's rescue, while Amethyst failed to fetch Wizeman for long enough. As soon as Garnet was caught on one of Wizeman's hands, the two entered on the ship.
Before NiGHTS could be defeated by Uramiko, a portal opened above them, teleporting Uramiko back to a blue, ice-y place you might know as Ice Cap Zone. Uramiko jumped to try and come back to the Monster Temple, but Eclipsa closed the portal in time, making Star kick the chopped off arm of Uramiko with disgust.
"Eclipsa, I hope you visit me back on Nightopia.", NiGHTS thanked off for Eclipsa's rescue, before flying on the sky, leaving behind cyan dust from her fingertips.
She chased at high-speed the ship, where Amethyst, Steven and Cream were already in.
"Are you two ok?", Steven said, he and the other two unaware of NiGHTS entering inside the ship.
"Half.", Amethyst replied, pointing to a Cream that was agonizing because of lack of air. Before she could suffocate for sure, Steven attempted to bubble her head, despite her not being connected to gems at all.
"Thanks...", Cream thanked, after recovering enough breath. "I hope I can find the rest of my friends, soon."
"Don't worry, I bet we will.", Steven comforted his new rabbit friend, before rushing it along with Cream and Amethyst inside the ship.
"...what we'll do?", Star asked to Eclipsa, as both watched the donut-shaped ship fly away at high speed.
"For now, I must keep the Monster Temple safe. But I'll try to send you to the world where that menace stopped.", Eclipsa explained, before lifting the royal wand high.