Watching horror special of her favorite superheroes series, the Stellar Busters, Timmy's eyes were sparkling as Crimson Cheek, Lady Liberty, Athena, Crush Nebula and The Harpy were fighting against their new villains; Medus the Gorgon Lord. The ruler of Gorgons found as statue in Athens, Greece, by historians who inadvertently freed him from the seal and causing havoc in entire Europe by turning his victims into stone with one look in his eyes. Assisted by is two older brothers Pegasus and Chrysaor the giant, he invaded the Mediterranean Sea to avenge their mother Medusa who was victim of their father Poseidon's carnal desire.

Though, he wasn't born as Gorgon. As mortal he was loved by Athena until lustful Aphrodite forced herself on him. Refused to listen to his words and believing he has betrayed her, she awakened his power out of anger. But it was one of her grave mistake. The curse repeated the history as Medus developed hatred on Athena as well. Painfully for the warrior goddess, the only way to break the curse was decapitating his head which is something she couldn't bring herself to do so.

"It is always the Greek deities…" Wanda sighed, shook her head as Poof hid behind Timmy in fear of the fictional monster.

"Tell me about it…." Timmy rolled her eyes.

Gary watched along while eating popcorn as Eddie was chomping on sunflower seeds, focusing on the screen.

"Hey, ain't you going to plan something for Halloween tomorrow?" Gary asked.

"Well, yeah. I'm planning on wearing witch costume." The brunette replied.

Then, both groaned as they heard her parents calling her out from downstairs. As Timmy walked down the stairs, she tilted her head in confusion unable to sense the presence of her teenage tormentor.

"Mom? Dad? What's going on?"

"For the Halloween, you would be accompanied by a babysitter~!" Mr. Turner replied cheerfully.

"But since Vick is out of town, we managed to hire temporary babysitter for day~!" Mrs. Turner finished for her husband.

"Temporary babysitter?" She blinked her eyes, turned her gaze towards the door.

As her parents opened the door, Timmy saw teenaged girl with long wavy black hair, bright blue eyes. The girl was almost same age as Vick around 16 or 17, having a healthily skinny waist and a perfect figure not all teen girls have. She was smiling friendly and entered.

"Hi, I'm Danielle Fenton," she introduced, "you can call me Danni."

"I'm Timantha Turner! Call me Timmy."

With her parents already left with goodbye, Danni turned her attention back to pre-teen brunette.

"So, planning something for Halloween?"

"Me and my friends are actually invited to Halloween party," Timmy answered, "and I planned to be a witch for costume."

"Sounds nice~," Danni's eyes caught Gary peeked from the stairs, "and who's he…?"

"Oh! That's Gary. He is my friend."

The raven girl waved to Gary who simply waved back. Timmy formed a rather uneasy smile, feeling strange of Vick's absence and having "substitute" babysitter. The pink-hatted brunette could only hope that Halloween goes well at the next day.

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At the endless night of Anti-Fairy world, the castle was crowded with floating Anti-Fairies cackling and giggling with evil enthusiasm. The globe on the center was glistening as the ruler of dark fairies emerged with black sands.

"A day left before Halloween begins~," Nero chuckled, "a truly thrilling game to test mortals through their greatest fears…~."

The dark fairy of Nightmares and Fears loomed over the globe, observing oblivious humans in Dimmsdale, the town running by hopeless, useless hands of Mayor with poor parenting suffocate the children who are looking for day of their favorite Holiday. October 31st, the day of Halloween where children would dress up as ghosts, monsters or other fictitious figures going from door to door for candies exclaiming "Trick or Treat!". All Hallow's Eve. Known as a day to remember the dead, including saints, martyrs and all the faithful that has departed. But that is also the day people must stay alerted as it is a day Nero, the dark fairy of Nightmares and Fears, takes charge of the holiday influencing the whole world into spooky, frightening games he called "test" to see humans facing their fears. The more they consumed in fears and nightmares, the stronger and powerful Nero becomes.

"What could be more exciting that this…~," the black-haired dark fairy grinned, "children who dress as tragic monsters wronged by Greek holy tyrants, and the heroes who doomed them~."

Anti-Cosmo laughed with his wife as their son held back his amused giggles.

"This will be very entertaining…~," Nero held his black sand, waving it around and shaping the soft dark sand into form of monsters, giving them a life, "you all know what to do~."

The anti-fairies were ready to carry on with their annual duty of Hallow's eve. With unison of enthusiastic laughter, they flew out and directed to the Earth leaving Nero to gaze at the the globe, his vision intently gazed at Dimmsdale. He could see his anti-fairies spread around with their wands point at children's costumes, jack-o-lanterns and head of children initiating his game. Especially all dedicated to certain brunette godchild who was in peaceful slumber.

"The game begins…~."

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Wearing the witch costume, Timmy looked at herself in a mirror. Well-decorated black hat with wide brim almost covered her eye with the top tilted to the side, her dress was entirely black with dark red bodice surrounded her waist, pair of long heeled boots were buckled. Cape was around her shoulder with one strap, she was also holding the wooden staff with the glowing green orb attached on top.

"You look like gothic version of Blue Fairy." Gary commented.

Eddie inside the gerbil ball nodded in agreement.

"Oh shut up, Gary! You look like a emo Chucky!"

Gary was wearing a black leather jacket, white shirt and dark trey denim with one strap on shoulders, his once greasy hair was down and covered his other eye, unruly and he was holding a wooden knife.

"Let's get this over with…" The former imaginary friend rolled his eyes.

Danni was in casual outfit, waiting for the two downstairs. Watching them, she beamed as she opened the door.

"You guys ready?"

"Born ready!" Timmy and Gary replied in unison.

However, as soon as they walked out of the door, their eyes widen at what they were witnessing. The street, the houses, the surrounding were eerily dark. It was only five o' clock sharp yet the sky was dark as late night. The street was filled with children but… their costumes looked so real. Too realistic. Timmy, Gary and Danni were theorizing correctly that something supernatural must have occurring through Dimmsdale.

"Oh no…," Timmy quickly grabbed Gary's hand and stormed towards where the Halloween party was supposed to hold; Remy's mansion, "let's go!"

The raven haired girl's eyes briefly glowed as she breath out cold air, sensing something. Concerned, she did not hesitate to follow the two buck-toothed pre-teenagers. The paranormal sense went stronger as Danni gazed at the mansion of Buxaplenty, dark clouds from above were surrounding the roof. As soon as Gary and Timmy reached to the gate, it opened unnaturally as if the mansion itself was inviting them in.

"What took you so long to be back from Fairy World…?!" Timmy huffed as she saw their fairies poofed in.

"Well, sweetie…," Wanda began nervously, "we have a terrible news…"

"What, like, this happened because many kids wished the Halloween is real?" Gary scoffed, sarcastic.

"Close enough," Wanda replied, hands on her hips, "but Halloween happens to be the day in charge of Nero the Dark Fairy. A day he can make children AND adults suffer their greatest fears and nightmares!"

"How does he know everyone's fears~?" Cosmo asked, clueless but his question was dismissed.

"He is manipulating the Halloween to provoke everyone's fear! And the more everyone is afraid—"

"The more powerful he gets?" Timmy finished.

"Exactly!"

"But this time, we are playing game~."

Timmy's eyes widen at the familiarly soothing yet bone chilling voice. Poof hid behind Timmy as Cosmo held Wanda tightly in fear. Gary was jumped by the voice and looked around to look for the source of voice. Then the mass of black sand with dark mist gathered at the center of Buxaplenty's Mansion where the fountain stood with statue on. Combining, the statue was replaced with entity of fear and nightmares chuckling at them as Cosmo, Wanda, Poof, Gary and Timmy gasped.

"Nero the Dark Fairy?!"

"I won't make excuse of this," he grinned, his golden pupils glinting, "but what your little nagging fairy said is true…~. You want to save others, don't you."

Timmy frowned.

"Well, you can," he added, not taking his gaze upon the two preteens and three fairies, "but, only by winning this game."

"What game!" Gary hissed.

"Conquering your fears," Nero replied, "in this mansion, I set some beasts and tragic yet paranormal beings that has terrorized children around or over your age's heart and soul. If you defeat all of them including the Boss leveled one, I will revert the day as normal childish day of Jack O' Lanterns, candies and less scary costumes~!"

'He's technically enjoying this…' Timmy muttered from her mind, aghast of this dark fairy's sick sense of entertainment.

"Tim-Tim. Don't listen… this is obviously a trap," Gary whispered to her, "we can think a our way to get out and find another way—"

"I accept your challenge." Timmy cut him off, her stern eyes kept on Nero who smiled in joy.

"TIMMY!" Her fairies and former imaginary friend exclaimed.

"That's the spirit…~," he clapped excitedly, "let the game begin~!"

With that, his form disappeared as the large front door of Timmy's blond rich friend's mansion opened. The brunette was aware of the "game" set by Nero, but as secret trap to gain more power from her and others. Taking deep breath, Timmy grabbed her staff tightly.

"Let's do this."

Nodded in unison, the gangs entered as the door slammed shut behind them.

Meanwhile, Danni's glowing eyes narrowed as she was surrounded by children who were possessed by their costumes overshadowed by ghosts. She has no idea where did all the apparitions came from, nor how did they control the inanimate outfits to brainwash the kids. Inhaling and exhaling, she was in her prepared position for ghost hunting.

"Going ghost."

The neon blue ring surrounded her until he sprung out. Her black hair was replaced with white silver, her casual outfits was no more as she now wore black and white outfit as her body shape was much more visible. Her blue eyes were now glowing green.

Little did she knew, Anti-Fairies were witnessing from the sky.

"Who is that ghostly human girl?" Foop asked his parents.

"She won't be much a threat, son," Anti-Cosmo replied grinning, "but testing this girl's abilities won't hurt as well~."

The Anti-Fairies giggled darkly, watching the ghost girl fighting the ghosts that are overshadowing the children. That is, she was challenged with the task until…

"Hey…"

Anti-Fairies flinched at the tone of voice. Danni stopped and turned to see a teenaged, evil babysitter hopped off from his motorbike. Vick marched towards as the overshadowed children cowered in fear, refuse to attack him. His glaring eyes were intimidating the girl as he scowled.

"Where. Is. The TWERPETTE."

Inside the Buxaplenty mansion, Timmy didn't really expect the monsters would appear out of nowhere unannounced. However, that didn't mean she was not enjoying it as this occasion reminds her of the times she played VR games in arcade shooting down monsters. Gary was throwing his wooden knives—as she has no idea how he got many of them—at the monsters, decreasing their HP while their fairies were in disguise as weapons; Cosmo as the orb of Timmy's witch staff, Wanda as a sword while Poof is in Timmy's purse shooting ray from his rattle. Thankfully, the invited children were unharmed as they were only kept in separate room hiding.

"Remy! Remy, where are you!" Timmy looked around.

Hearing his reply from distance, they quickly ran to Remy's room where the blond rich boy, dressed as Vampire prince, was inside.

"I'm right here…!" Remy whispered.

"Come out!" Timmy gestured him to leave the room.

As Remy ran out, they stormed towards the stairs, ran down as fast as they can until all have heard an ominous hissing. Multiple of them.

"…Oh [CENSORED]…" Timmy and Gary gulped, somehow knowing who it was.

Timmy hastily grabbed Remy and hid inside the unused guest room, door closed. Noticing the keyhole, Gary peeked through to see the source of the hissing noise.

"What was that….?" Remy whispered.

Gary's eyes widen at what he has seen. The silhouette of a man with wings and his prehensile hair was stalking the hall. All remained silent until the hissing was gone.

"Remy," Timmy whispered back, "do you have a mirror or silver plates…?"

And the next, all were holding the silver plates, tip-toeing the hall. Expert with games, Timmy knew the boss leveled monster would be in a living room or at the spacious lounge with no windows. Juandissimo poofed himself several materials until he become a key and unlocked the lounge door. The gang entered silently, glanced around. The silver plate Remy was holding glistened as he looked down, frozen to see what was on the ceiling.

"Run!" He screamed, alarmed.

The group dispersed and held their silver plates or mirrors, feeling the great impact of a figure landed at center. The hissing was heard clearly and it sounded irritated, along with soothing yet cold voice belonged to the man their gaze evaded from.

"Another innocent, hopeless mortal children…"

Looking at the reflection of the figure, what they expected was correct.

"…Medus…!" They shuddered.

Asps for the hair, the mythical monster's eyes narrowed. This lord of Gorgon was none other than Medus, a same beast Timmy and Gary has watched day ago in their favorite superhero series adapted from historians' recent discovery of his existence as Medusa's hidden third child and ex-lover of Athena.

"I see you've reached to the summit, thanks to your flying rabbles of friends…" The Gorgon man glanced at hiding fairies.

The final boss of Nero's nightmarish game.

'I thought he is somewhere hidden underworld or dead!' The former imaginary friend kept his eyes shut.

"It's rude to not looking people in the eyes…," Medus approached to Remy who covered his eyes with his hands, "the ones say the eyes are window the the soul…"

The blond boy flinched, feels the snout of serpents touching his cheeks, even their thin tongue licked as if they wanted to taste him.

"I hope you find my eyes… attractive." Medus hissed at the last word, tone remained cold as ice yet inviting, provoking his prey's curiosity.

It was too late to turn back as Remy was consumed with curiosity, his eyes opened. He let out a gasp of fear as Medus shrieked, fangs sprung out with his eyes glow, leaving the rick boy petrified. Literally. Sneaking her glance at Remy who had turned into stone, Timmy paled.

'Holy [CENSORED], Remy…'

"Aww…, I left him speechless, haven't I…," Medus mused, "don't worry… he will live again, when you defeat me."

Knowing informations about Gorgons, the brunette in witch costume knew there's only way to slay them; decapitating their head. However, none of them has real swords or sharp blades to do the work. Gazing at the holographic HP, the best bet was to decrease them with constant attacks. At least the Gorgon ruler was polite enough to place the petrified Remy upstairs with his extended snakes to prevent him from destroyed. Then the group split up as the hair serpents charged at them. Gary held out his sunglasses, putting it on in order to weaken the Gorgon's eyes' effect on him. But the challenging one for now is getting away from the snakes that are keep stretched out to bite or attack.

"Timmy, since we don't have sharp sword, what are you going to do…?!" Wanda asked.

"Simple," she replied, "attack his wings and snake hairs."

"Well, that'd be convenient if his hair doesn't regenerate!" Cosmo pointed out, obviously scared and jinxed his words.

Gary threw the wooden daggers at Medus, sliced several snakes off. But much to his surprise, the Gorgon's snakes regenerated.

"COSMO!" Wanda and Timmy yelled in unison.

"… NOT COOL." Gary sighed, dropped his daggers in defeat as Medus turned to him.

Before Medus could petrify Timmy's ex-imaginary friend, the door BURST opened, the aura of powerful teen entered.

"TWERPETTE." Vick growled, "WHERE'S TOOT…"

The red-haired teen the noticed the monstrous Gorgon lord whose eyes were attentively on him as well. He did budge when Medus' snakes grabbed him.

"VICK!" Timmy screamed, concerned.

Medus slithered closer, activated his petrifying gaze on him. Timmy, Gary and their fairies closed their eyes for the worse, but heard nothing. Slowly, they sneaked their eyes. Astonishment was filled in their widen eyes to see Vick unharmed, not even petrified.

"What…!" Medus growled, confused.

Then everything seemed to stop as Vick's glare hardened, releasing the most infamous willpower. Bloodshot formed in his sclera, his arched brows knitted as veins popped around his eyes. The red-headed teenager scowled as predator, gazes piercing through the Gorgon's very soul. Medus flinched, disturbed by the power the mortal was holding.

Taking this as an opportunity, Timmy charged.

"HIT THE DECK!" She screamed as most did, aiming her staff at Medus.

Cosmo, as the staff's orb, shimmered then shined bright before released the ray at Medus' wings. The Gorgon shrieked in pain as Gary saw the monster's holographic health bar. His HP decreasing. His wings fried and white feathers torn, Medus glared in anger.

"You BRAT!"

As his clawed bronze hands could get on Timmy, Vick grabbed him by his hair serpents. And the preteens regretted to see the gore as Vick RIPPED the serpents off of Medus' head leaving only several of them letting out pained cry with their master.

"Whoever the hell you are, or where you from… STAY AWAY FROM TWERPS."

The ruthless teenager didn't hesitate to grab the monster by his neck, strangling it.

"For the record, I think Nero used wrong source of our… fear." Timmy gulped as Gary nodded in agreement.

As Medus' HP was about to reach to zero, everything froze. Only except Timmy, Gary and their fairies. They glanced up to see Nero who seemed intrigued and impressed by the revelation of his game.

"That's a fabulous surprise…~," Nero tilted his head, "and you are all didn't turn into stones… perhaps I miscalculated this game."

Anti-Fairies surrounded them as the two god-kids were on their fighting stance, but interrupted.

"But rule is the rule.., meaning your fear is conquered thanks to your babysitter's arrival," Nero clapped his hands to the Anti-Fairies, "game's over, children~! Chop-chop~!"

They childishly groaned and raised their dark wands. Nero made a side-glance as Danni entered, forgotten to revert back to normal as she saw the dark fairy.

"Hey, ghost! Get away from Timmy and Gary!"

"Danni…?" Timmy blinked.

"Anti-Cosmo…~," Nero called out, "I recalled you said she was to be taken care of…~."

Cosmo's evil counterpart gulped nervously. However, Nero dismissed it as Danni held her Fenton Thermos, activating it. Only to see Nero wasn't sucked inside.

"Tsk~ tsk~, young lady, you should know that I am not a lowly ghost." He let out a mocking chuckle.

"What…?!"

"But by the time this is over, you won't remember a thing~!"

With that, the Anti-Fairies' wands sparkled and created enormous bluish white mist all over the town, his game was finally over.

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With everything back to normal, kids who were invited to Remy's Halloween party couldn't remember anything after the outbreak of Nero's trap. All they say was that they must have had bad dreams. The blond rich boy couldn't remember his encounter with the Gorgon monster as Medus was disappeared along with the dark fairy.

"What a dream we had…" Chester, in costume of werewolf sighed.

"Yeah, almost as if it's real…!" AJ added, wearing as Frankenstein.

"Come on, guys~! It's all just a dream…~ Pre-party jitters, maybe." Timmy said, letting out awkward giggles.

"How was the temporary babysitter? Was she nice~?" Chloe the medieval princess asked.

"Yep~! Although I can't believe to say this… I kind of missed Vick." The brunette in witch's dress spoke as she looked at Vick who simply waved to Danni who waved back but smiled at Timmy.

"Oh my god, is that Tristan…?" Molly asked, looking at Chinese-American popular boy in hanfu.

"He looks cool today…~." Timmy smiled.

"But he's wearing a hanfu DRESS." Molly pointed out, slightly disturbed.

"Ay, cut the talk and let's enjoy the candies!" Gary said as he held bowl of confections and candies.

The children laughed along, enjoying the rest of the night in Buxaplenty's mansion as the neon green ray of light flew out the town to the direction of Amity Park.