Star vs The Forces of Evil belongs to Disney, Sonic the Hedgehog belongs to Sega, and any references to other franchises belongs to their respective owners. I DO NOT OWN ANYTHING. My writing is not 100% perfect so please understand if there's any words that don't make sense and misspelled. In the last chapter Star and Marco cross paths with Sonic and Tails and fought against Dr. Eggman. But they were caught off guard by someone new to Star. Let's continue where we left off in...

Sonic and Star in Adventure in Mewni 2


Chapter 4 - Rouge and Fang


Angel Island, Mobius


Somewhere in the skies of Mobius, we find floating Angel Island, home to its guardian Knuckles the Echidna, who is at the Master Emerald Altar, protecting the Master Emerald from a certain bat who he knows all too well. This mobian is an anthropomorphic bat with white fur, turquoise-green eyes with two eyelashes on each one tan skin and a curvy figure, large pointy bat ears, a small black nose on her muzzle, a short pointy tail and dark purple bat wings on her back. Her attire is a black, skin-tight and strapless low-cut jumpsuit that sported a pink heart-shaped chest plate outline with thin white trim. A set of elbow-length white gloves and thigh-high high-heeled boots with pink cuffs to match them, with the latter featuring both gray soles and heels, along with steel toes in the appearance of pink hearts that matched her jumpsuit's chest plate. Her name is Rouge...Rouge the Bat.

"Just let it go, you don't know when to give up, do you?" said Rouge taking deep breathes after battling with Knuckles at the bottom of the altar's stairs as Knuckles replied as he raises a fist. "What are you talking, The Master Emerald belongs here on Angel Island, I thought you've given up on that?"

"Can't blame a girl for trying, I maybe a G.U.N spy but I'm still an excellent jewel thief, after all, all of Mobius' gems are mine to keep."

"Well, this emerald is more than just a jewel, the Master Emerald contains special powers, powers which can control and neutralize the energy of all seven Chaos Emeralds, that what make the Master Emerald very powerful, you got that?" then they heard a loud clank coming from on top the altar where the Master Emerald is. They look up and saw someone in an Egg Mobile wearing a renaissance outfit as snatches the Master Emerald with a claw that descends from the Egg Mobile.

"STOP THIEF!" yelled Rouge.

"Look who's calling who a thief!" remarked Knuckles.

Mina Loveberry loyal second in command, Manfred, look down at Knuckles and Rouge and spoke. " If what you freaks say is true, I see why Mina and Eggman Nega need this giant gemstone for our plans to take New Mewni."

"New Mewni?" whispered Rouge as Manfred continues, "the Solarian Warriors thank you in your 'donation' to the Solarian cause. Farewell anthropomorphic freaks."

"OH NO YOU DON'T!" shouted Knuckles as he run up the altar and leaps after the Master Emerald and with a single punch, shattering the Master Emerald into small emerald shards which flew and disappeared to who knows where. As the echidna landed on top of the altar, Rouge rushes up the stairs and grab Knuckles by the shoulders and shake him and yelled.

"YOU KNUCKLE HEAD LOOK WHAT YOU DID TO MY EMERALD!?"

"I did that to prevent the Master Emerald from falling to evil hands." said Knuckles as he pushes Rouge's hands off his shoulders and added "you see me do this before Rouge, if it's in pieces, I can restore it, and by the way, it's NOT your emerald!" Manfred flies away in the Egg Mobile while they are distracted and mumbles to himself "Oh Eggman Nega won't like this, he and Mina won't like this that all."

"You are not the only one who can find and locate the emerald shards too, like I said before, I am a jewel thief after all." then she uses her wings to fly way as Knuckles shakes his fist at Rouge and yelled.

"We'll see about that BAT GIRL!" then he felt the ground tremor and realize what's happening. "Oh no! it's starting to happen. Without the powers of the Master Emerald, Angel Island is slowly falling into the ocean below." this is not the first time Angel Island fell into the ocean and has survived worse. But as Guardian of the Master Emerald, he and his people before him have the ability to sense the Master Emerald's locate, even in shards, and this is not the first time the Master Emerald broke apart. If Knuckles could gather all the emerald shards, restore the Master Emerald and return it to Angel Island. The Master Emerald's power will restore Angel Island's ability to fly. But know he got to hurry, knowing that Rouge will also be searching for the emerald shards for herself.


Green Hill Zone Act 2, Mobius


"Oh, what happen...wait...WHAT HAPPENED TO THE CHAOS EMERALD?!" said Star as she and her friends regain eyesight to find the blue Chaos Emerald that Star has in her hands is gone. Same with Dr. Eggman who he, and his Egg Mobile has disappeared. "Looking for this Chaos Emerald?" said the Eggman like voice from before and our heroes look up to see someone that look like Eggman with a gray mustache and different attire holding the blue Chaos Emerald in his hand.

"Eggman Nega?!" shouted Tails as he and Sonic remember their past experiences with Eggman Nega. Then Marco spoke "Eggman...NEGA!? Are you guys serious? Is this guy related to Dr. Eggman?"

"Well...yes and no on that last question." answered Tails

"What that's support to mean Tails?"

"I'll explain later Marco."

"I bet he is the one who gave Mina the Chaos Emerald you mentioned earlier Star." said Sonic. Then Eggman Nega greet himself to Star and Marco. "Well hello Star Butterfly, former princess of Mewni, I'm happy we can finally meet in person, I have learned a lot about you and your boyfriend Marco Diaz."

"So, it was you who is helping Mina? WHY? If you did your research on me, you know that Mina Loveberry is insane, as in like cuckoo crazy insane." asked Star feeling a little bad for accusing Dr. Eggman for something he did commit for once.

"You can be surprised, Me and Mina have a lot in common, like wiping out unwanted pest for explain." then an angry Sonic spoke. "I hate to say it Star, but Eggman Nega is kind of like Mina, he once team up with our Eggman and tries to mess up mine and Blaze's dimensions twice, try to alter time with an advanced camera from two hundred years in the future, and try to unleash a flame monster to destroy Mobius once time by kidnapping peaceful creatures called Chao and feeding them to that evil fire creature. Yeah, Shadow and Silver told me about that Eggman Nega. So what are you up to this time and why target New Mewni?"

"Oh all in good time Sonic, all in good time. But I have got to go and taking this emerald, but I'll give you a hit, it has something to do with the Spell with No Name, I sure Star here could tell you everything about it. HO HAHAHAHAHAHA." then Eggman Nega drop a smoke bomb and cover his escape and by the time the smoke cleared, our heroes found that Eggman Nega is long gone.

"OH DARN, first Eggman and Seth, Now Eggman Nega and Mina Loveberry?! Sonic if what you about Eggman Nega is true, then I think both of our worlds are in big trouble." said Star who is shaken up after Eggman Nega mentioned the Spell with No Name, which was once a most powerful and dangerous spell created by Eclipsa as a way to kill a Septarian like Seth. In fact, Star witness it power when Eclipsa use it to save Star when Mina and her Solarians went on the rampage which is why Eclipsa never gave that spell a name, and as far as Star knows, it could be the only spell that kind of uses dark magic due to how destructive it is.

"You can say that again Star, but what did he meant by when you explain a spell with no name?" asked Sonic who unlike Star never witness the Spell with No Name in action. Star took a deep breath and said to Sonic.

"It's a very long story, I'll explain that...yeah did you hear something?" asked Star when she heard a faint voice called out Sonic's name. The rest began hearing it too as this faint voice gets louder to which realize that Amy is coming. Then before anyone could do anything, Amy Rose rush pass Star, Marco, and Tails and quickly hug Sonic and spoke.

"Sonic, I finally found you, I got to tell you about Eggman Nega!"

"Um, Amy, we already know, he just escaped with a Chaos Emerald in hand."

"Oh, you have? Well, sorry I wasn't here sooner and-" Amy stop as she noticed Star and Marco and asked. "Um, who are you?"


Pumpkin Hill, Mobius


Meanwhile at Pumpkin Hill. We find Rouge the Bat who just uncovered the last of the three emerald shards in the area. She already found three shards in Emerald Hill Zone on West Side Islands and another three shards in Aquatic Mine near Pumpkin Hill and the only reason why she come to this 'Halloween themed zone' because her emerald detector located the shards here and glad to finally get out from underground after searching in Aquatic Mine for an hour and she is happy to fly in the air again, although searching here does give you a few goosebumps due to the atmosphere here in Pumpkin Hill, now she know hoe Knuckles' feels when he come here the first and only time all those years ago. But she's finally happy to leave now that she found all of the shards in Pumpkin Hill.

"Finally, all three shards in this creepy place, after searching for hours in those damp mines, I hope I never come back here." Rouge said to herself as she flies off a hill and into open sky. However, a small missile flies in front of her from her left side and has to stop in midair as the missile fly way and exploded. She turned to see who try to shoot her down and see an anthropomorphic jerboa on a yellow hoverbike.

This jerboa has purple and white fur, light blue eyes, a large, sharp fang on his left side of his mouth, long ears, a pointy blue nose, long feet and a long thick purple tail. He wore a big brown Stetson hat with a black band, brown gloves with metal plates on them, a brown belt with a gold buckle and brown boots with white gaiters.

"Fang!" shouted Rouge hovering in midair, she recognized the bounty hunter/treasure hunter on a wanted poster put by the Guardian Units of Nations (or 'G.U.N' for short), who she works for when she is not stealing gems for treasure hunting. "What are you doing here, and what with that missile? You almost shot me down?!"

"That's the general idea batty." spoke 'Fang the Sniper' in a somewhat Australian like accent as he put out his cork-shooting popgun from his holster and aim it at Rouge. "My employer wants those Master Emerald Shards you have and any Chaos Emerald I could find along the way."

"Well, you can tell Eggman that he can have these shards from my dead hands."

"Oh, this time I'm not working Eggman this time batty, so either you hand other those shards, or I'll make bat flambe out of you!"

"If you want these shards, you have to catch me first." answered Rouge then quickly fly pass Fang at her top speed which leads to Fang on his hoverbike called the 'Marvelous Queen' chasing at Rouge and began shooting corks and firing missile from a built-in missile launcher on his bike at her.

"HOLD STILL YOU WINGED RAT!" shouted Fangs as Rouge flawlessly dodge missiles cork projectiles while dropping numerous floating heart-marked mines to keep large numbers of missiles from getting too close, forcing Fang to dodge those mines after getting hit about a few. Although She could successfully dodge those missiles, but she knew it won't as long if she run out of her bombs or either a missile or a cork could knock her out of the sky. That's when she come up with an idea to end this chase, she remembered seeing this in a movie once as she managed to grab one of the missiles and used her most of her strength to redirect the missile back at Fang and let go shouted "try to dodge this, Fang?"

The redirected missile flies at top speed at Fang, not giving him a chance to dodge in, he panicked as the missile hit him and exploded. Rouge turns back to see her handy work with a smile on her face as she sees the smoke clear revealing Fang a little shaken as his hoverbike is still flying but taken heavy damage from that missile explosion which Fang knows that he's now unable to continue the chase and shouted at Rouge angrily, "THIS ISN'T OVER ROUGE, YOU HAVEN'T SEE THE LAST OF FANG THE SNIPER!"

"Fang the Sniper, Nack the Weasel, Fang the Hunter, you go by to many names for a small-time crook" tease Rouge as Fang silently flies way at the opposite direction. Then she thought of what Fang said earlier, about not working for Eggman this time. "He said Eggman didn't hired him, but this feels like Eggman plan writing all over it, I don't know anyone beside me, Eggman, and some of the members in G.U.N wanting the Master Emeralds for themselves, even if the Master Emerald is in pieces. Maybe these 'Solarians' that guy said earlier at the altar want the Master Emerald and the Chaos Emeralds for something big, and I have a bad feeling about these 'Solarians' whoever they are."

Then after thinking for a few minutes while flying out of Pumpkin Hill and over an open green valley, she finally decided something the said to herself in midair. "I hate to say it, but I think Knuckles may need my help if these Solarians are also after the shards...maybe I could convince 'him' to help out to if Sonic is involved too." then she put out her phone and called a friend of hers.


Star vs The Forces of Evil belongs to Disney, Sonic the Hedgehog belongs to Sega, and any references of other franchises belongs to their respective owners. I DO NOT OWN ANYTHING. My writing is not 100% perfect so please understand if any words are either misspelled or make no sense. I know what you're think. What about that Solaria clone? We have heard from her since the prologue. How does she fit into this story? First this is a crossover of Star vs The Forces of Evil, so expect some "Jannanigans". Second all will be revealed in good time. The story continues in the next chapter.