This is taking place shortly after Season 4 of The Phantom Twins.
In a Plumber's station about 100 miles from the sun, a certain prisoner was being housed.
"Agent to control ship, the prisoner is secure. Copy that."
With that, the agent ended the transmission.
"Can't say I'm surprised."
Unfortunately, the Plumbers noticed a foreign object hurtling towards the control ship.
The camera then zoomed in to reveal the foreign object to be none other than Vilgax, Conqueror of Ten Worlds, shouting out in anger.
"Attention, unidentified vehicle, you are in deep secured space. I will fire if you proceed," the ships captain said as he aimed the cannons that fired at the Chimera Sui Gerenis, only for him to activate the Shield of Seagle and then barreled right through the ship, bisecting it vertically and killing everyone onboard.
Vilgax made his way up to the control ship and opened the bay door with his brute strength.
In the darkness, it was only illuminated by the red lasers that rained upon Vilgax from the agents inside that just bounced off his armor. He then used his laser vision to blast all the agents away as he advanced through the ship.
The doors in front of him closed in, blocking him off from his target. But he simply punched through them all with nothing but a simple punch.
He gazed down to see his target, a simple Ectonurite under a gazing beam of pure sunlight, weak as hell.
"Help... please... the light... it burns!"
"And if I were to stop it?"
"Don't toy with me, Vilgax. Ask for what you want."
"I do not ask, Zs'Skayr. I demand and you obey! I will free you from your prison and in return, you will tell me what I wish to know."
"The knowledge to defeat Ben and Jen Tennyson? The secrets of the Omnitrixes?"
"Then I will set you free."
Little did Vilgax know, Zs'Skayr had his own plans in mind for Vilgaxia.
The Omni-Team was at the Bellwood miniature golf course as they all waited for Gwen to putt her ball with a bored look.
"...And five centuries later," Ben said.
"Look, Ben, you were the one who suggested miniature golf."
"That was only because there was supposed to be a rogue alien attacking this place," Jen yawned, holding up her Plumber's badge.
"It was supposed to be a cute alien," Becky perked up. "Not a scary one."
"Yeah, the scariest thing so far is how bored I'm getting," Kevin yawned.
Gwen finally hit her ball and it instantly sunk into the hole.
"Yes! Another hole in one!" Gwen cheered as she wrote down the score.
"You sure you don't want to play?" Jen asked Ally.
"I'll be fine. Only enough room for four."
That was when Ally's ball suddenly leaped out of the hole.
"I'm still counting that."
The team looked to see a cute pink alien sticking out of the hole.
"Finally, some action," Ben said as he and Jen walked up.
"Let's just bag this thing and go home," Jen said as they walked up to the alien.
The alien screeched at the twins before firing a green cloud from its mouth that instantly melted the golf ball like acid.
"This is why I hate mini golf."
The alien popped up back behind Gwen, who blocked the acid cloud with a mana shield before sinking back down.
It then popped up to Kevin and started drooling on the Osmosian's wooden foot with acid spit, causing him to yelp and hold his foot in pain.
"I hate golf, but I'm a big fan of whack-a-mole!" Kevin shouted, morphing his hand into a hammer.
He swung down and missed the alien as it kept popping up next to him in different holes.
Gwen began blasting her mana at the little thing and Jen put a hand to her head in an attempt to use her telepathy to sense where it was.
"I don't get it," Gwen said. "It's like it already knows where we're going to hit it."
"You're not fast enough," Ben said, slamming down his Omnitrix to become...
"Humungousaur!"
He then began stepping on the tiny alien, only to keep popping back up in front of his feet. The Vaxasaurian roared as he grabbed the mini golf version of Big Ben (ha ha) and slammed down on it, creating a massive crater.
"Hey, Gwen! Check it out. A mole in one!"
Unfortunately, Humungousaur felt a jolt on his tail and saw the alien gnawing at the tip of it with its acid saliva, causing him to shout in pain.
Becky set a golf ball up and readied her club over her head.
"Keep it there, Ben!" she said, readying her swing.
"But the thing's got acid spit!"
Becky shouted out and putted the ball right into the alien, sending it falling to the green in a daze.
"Nice shot, sis," Gwen said as Becky rested her club over her shoulder.
"Yeah. I guess that thing wasn't up to par."
"Hardy har," Ally said.
"What do you mean?" Kevin asked.
"Golf joke," Gwen said. "Never mind."
Jen and Ben grabbed onto the tiny pink alien and dragged it out of the green, revealing it to have several identical heads protruding from its giant worm-like pink body.
"Okay, next time, we're going go-kart racing," Jen said with a sigh.
"Agreed."
That was when the team saw a large comet sailing through the sky and crashed in the city.
"What was that?" Ally asked.
"Whatever it was, it better not have wrecked my ride!" Kevin shouted as everyone ran to the crash site.
"Levin, all you care about is that car!" Becky shouted.
Jen activated her badge and contacted her superiors.
"Grandpa Max, the alien is knocked out at the golf course and is ready for the Null Void. We've got bigger fish to fry now," she reported as she and her brother ran off.
The team arrived at the crater with a lot of debris around it and the smoke cleared to reveal a rather beat up looking...
"Vilgax!" Ben and Jen shouted as Jen transformed into her Anodite form and Ben readied the Omnitrix.
"Ben and Jen Tennyson... I... need your help."
"Say what now?" Jen asked, transforming back in an instant as she and Ben looked confused.
The team later met up with Vilgax at Burger Shack, the twins staring down the alien warlord with nothing but hatred apparent in their eyes.
"Burger Shack?"
"Oh, I got you the kiddie meal," Ben said, handing over the food. "So don't let these guys know you're over eight."
The twins went over to their team at the table and Ben reached for a few fries, only for Gwen to yank them away.
"What's the deal, Gwen?" Jen asked.
"Don't you two remember how many times this guy tried to kill you two?"
"Too many to remember how many times," Ben said. "That's why him groveling for our help is so much fun right now."
"Sorry, Vilgeek. What was it you need again?"
"I. Need. Your. Help."
Jen giggled as she held up her phone and pressed play.
"I. Need. Your. Help."
"Like my new ringtone, bro?"
"It's awesome," Ben chuckled.
"You shouldn't even be here, Vilgax," Gwen said.
"The twins beat you in the Conqueror's Challenge. That makes them the unofficial rulers of Planet Earth and per rules of the Galactic Code of Conduct, you were banished from the planet forever," Becky said.
"What makes you think that Ben and Jen are going to help you with anything!?" Kevin demanded.
"One word... Zs'Skayr."
"Um... who?" Jen asked, raising an eyebrow.
"You may know him better as... Ghostfreak."
The twins were both taken aback by this as Ben stepped up. "What about him?"
"Interested now? He escaped from you Omnitrix, Ben. He almost destroyed you two."
"We know. We were there," Ben said.
"Yes. And I was there when he escaped from the maximum security prison built to hold only him!"
"So Ghostfreak... or rather Zs'Skayr is on the loose?" Ally asked.
"And he's more powerful than ever! He tried to possess me."
"That guy always was the possessive type," Jen remarked.
"Okay..." Kevin said. "But that still doesn't explain why you're here, Squid Face."
"Even though I just barely managed to drive him off... Zs'Skayr still wasn't finished with me. But instead of seeking revenge directly, he attacked my home planet. Every single one of my people that he possessed became an Ectonurite minion. Enslaved to his hive mind. I tried to defend my home world but the infestation spread exponentially. Within weeks, Zs'Skayr controlled my entire planet. He had me completely outnumbered and overpowered. There was nothing I could do except escape and bring back help. That is to say, you two, Ben and Jen Tennyson. The only two ever to best me in fair combat."
"And you expect us to come back to Vilgaxia with you, why exactly?" Ben asked.
"Because this is your fault!"
"What?!" Jen asked. "We've never even been to your home planet!"
"But you two freed Ghostfreak from the Omnitrix and his actions are your responsibilities. But of course, if you'd rather I do it alone..."
"No way, Vilgax," Ben said.
"And how did you know-" Gwen asked.
"We are wasting time! My people are not warriors like me! They are innocent women and children!"
"Why should we believe anything you say?" Ally asked him.
"What other reason would I come groveling to your pitiful planet."
"Actually, he makes a good point," Becky said.
"Oh come on, guys!" Kevin shouted. "This couldn't be a more obvious trap if there were a sign that read 'Free Cookies!'"
"Maybe," Jen said. "But if he's telling the truth..."
"Then Zs'Skayr is our responsibility," Ben said. "We're going."
"We can't just let people suffer," Gwen said.
"Better them than us," Kevin sighed.
"Our watches, our responsibility!" Jen shouted.
"It's not all about the Tennyson Twins!" Kevin reminded.
"Vilgax won't touch you guys while we're around. It's going to be fine," Ben said as he and his sister turned to them.
"But the first sign of a double cross, and we're having fried calamari tonight," Jen warned.
"Wait," Ally said, crossing her arms. "If what Vilgax said is true, then Zs'Skayr has grown a hundred times more powerful than he was five years ago."
"And he's got an army of Ectonurite slaves around him," Becky remarked. "And if they possess any of us, in an instant, we'll be one of them."
"We may need some extra help," Gwen considered as Kevn scoffed.
"Oh, please. What kind of help could we get that can take on a complete army of ghosts?"
Those last three words hit Jen like a truck as she gained a mischievous smile on her face, raising her eyebrow.
"Well... I know a girl."
"Huh?" Gwen asked.
"She and her brother are basically just like me and Ben," Jen said, crossing her arms. "They even saved our entire planet from an asteroid that would have destroyed us all while Ben and I were retired."
"Oh, I know who you're talking about now," Ben said.
"No way," Gwen said, smiling. "You're thinking about asking the Phantom Twins for help?"
"When else are we going to get this opportunity?" Jen asked. "Jack and Maddie Fenton are the world's lead experts on ghosts."
"But not alien ghosts," Ally said, standing up.
"That's exactly why they need us for this mission as much as we need them," Ben said. "We're going to them."
"Vilgaxia's going to have to wait a bit, Vilgax," Jen said. "Next stop, Amity Park, Minnesota."
Ship flew down over the town of Amity Park, Minnesota, catching everyone's attention from down below as Ben and Jen activated their Omni-Suits and smiled as Jen limbered herself up, shaking her hands as she smiled.
"Is this really necessary?" Becky asked.
"What can I say? We like to make an entrance," Ben said to them as Jen smiled.
"Phantom Twins and Omni Twins teaming up together at last," she said as they touched down and she shot her eyes to Vilgax with a glare. "Stay here. I know this town deals with ghosts on a regular basis, but they'll lose their minds if you show up."
"Fine."
"Showtime, guys," Ally said to them as the hatch opened up to reveal they were in the park as they saw two young adults figures in black and white hazmat suits flying up to them as the twins nodded.
They both had hair as white as snow and electric glowing green eyes. They each wore a black hazmat jumpsuit with a white "DP" logo emblazoned on the front and white gloves, white boots and a white utility belt around their waists. The only difference in the outfits was that the girl's had a bit of a skirt below the waist.
"The Omni-Twins?" the girl asked, flying barely above Ship. "Here in Amity Park?"
"What would world-famous superheroes be doing here?" the boy asked.
"Really, bro? We're kind of the same thing as them, only we fight ghosts and they fight aliens."
"Yeah. Maybe they need our help for something."
"Let's find out."
The two then flew down to their level as Ship landed.
Ben and Jen activated their Omni-Suits but left their heads exposed for trust reasons and smiled slyly with Jen placing her hands on her hips and Ben nodded as the two ghost twins landed next to them and Ben and the boy smiled slyly and Jen and the girl did the same.
"Omni-Twins," the Phantom Twins said in unison with a nod.
"Phantom Twins," the Omni-Twins said, returning the gesture as well as a handshake.
"Introductions would be necessary at this point," Kevin said from Ship.
"Right," Ben said. "Let's talk. In private. Twins to twins."
"Done," the girl said with a smile and a nod as she shook Jen's hand. "You obviously know who we are, but a quick review. I'm Dayla Fenton. Or rather Dayla Phantom right now. This is my twin brother Danny."
"It's an honor to meet you. Kind of nice to see that the world has other superheroes besides us," Danny said.
"We're the originals," Jen said with a smile as she and Ben deactivated their Omni-Suits and the Phantom Twins transformed back to human form, two white rings forming from their waists and moving vertically up them as they hit the ground, changing their hair to its normal black and their eyes to their normal blue.
Danny wore a full red short sleeved shirt with a black jacket, his slightly dark blue jeans and red converse shoes.
Dayla wore a light blue long sleeved shirt with a short sleeved purple shirt over it, her black jeans now purple converse shoes.
"Jen Tennyson."
"And I'm Ben Tennyson."
"Wait, you're Jen Tennyson?" Dayla asked, shocked.
"Yep. Get any of my messages lately, Dayla?" Jen asked with a smile.
"All of them. I just never knew you were a superhero too."
"I only learned after your identities became public knowledge, to be fair," Jen chuckled.
"You know her?" Danny asked.
"Not very well. I never met her in person," Dayla said with a chuckle. "We're just pen pals."
"You never told me you had a pen pal."
"Just because we're twins doesn't mean I have to share everything with you, bro," Dayla said.
"So what brings you and your team to Amity Park?" Danny asked.
"Here's the thing," Jen chuckled as she rubbed her arm. "We and the Omni-Team fight aliens and you two and Team Phantom fight ghosts..."
"And we figured if we were going to take on an alien ghost," Ben chuckled, causing Danny and Dayla's eyes to widen in awe at those last two words as he chuckled. "We had to bring in the best of both worlds, if you catch my drift."
"An alien ghost?" Dayla asked, really intrigued. "Tell us everything."
The two sets of twins met up at Fenton Works, the twins' home where they met the rest of Team Phantom.
Sam Manson, Danny's girlfriend, had slightly black hair that was just at her shoulders and she now wore a black short sleeved shirt that exposed her midriff, short purple lace fingerless gloves, black combat pants and black combat boots.
Tucker Foley, the team's tech expert, wore a red beret, a yellow short sleeved shirt with black trimmings on the sleeves with a white long sleeved t-shirt underneath with also black trimmings, his usual green cargo pants and brown boots.
Andrew Knight, Dayla's boyfriend, wore a white short sleeved shirt with a long sleeved red and black checkered shirt over it and left the buttons undone, light blue denim jeans and black combat boots.
Valerie Gray, Tucker's girlfriend, wore a black skirt with a yellow singlet top but now an orange cardigan with it and white boots that went to her knees.
Dani Fenton, the twins' little sister, wore a red headband, she also now wore red jeans, a blue short sleeved hoodie with a white long sleeved shirt underneath and blue converse shoes.
Finally, Dale Fenton, Dani's twin brother, wore a green long sleeved shirt with a black vest, blue jeans and green converse shoes.
"So, an alien ghost?" Tucker asked, raising an eyebrow in curiosity.
"Yep," Ben said. "He's grown in power exponentially since our last encounter with him five years ago."
"We figured in order to beat him, we needed to combine our alien skills with your ghost skills so that we could have him equally matched on both fronts," Jen explained.
"And you want us to go to an entire other planet to take him on?" Andrew asked, slightly raising an eyebrow.
"That's exactly what we need from you guys. You guys have a complete mastery over fighting ghosts that we don't," Ben said.
"And we have an extensive knowledge of aliens that you don't," Jen added. "The only way we can take Zs'Skayr down is to team up with you guys."
"You did always want to be an astronaut, Danny," Sam reminded her boyfriend as he smiled.
"Let's do it," Danny said, standing up.
"We've never backed down from a ghost fight yet and we're not starting now," Dayla said. "We'll do it."
"Count me in too," Valerie said, pressing a button on her bracelet that instantly coated her in her ghost hunting armor and they looked at Ship waiting outside.
"Let's do it," Dani and Dale said in unison.
"Actually, you two had better stay here," Danny said, leaning down to meet the twins.
"What? Why?" Dale asked, disappointed.
"Someone has to protect Amity Park while we're away and you're not as powerful as we are yet," Dayla agreed.
"Fine," Dani said. "Tell us how your space trip was."
"Gather the gear, guys," Tucker said as everyone walked down to the lab. "Something tells me it's going to be a long flight to wherever this planet is."
The Omni-Team and Team Phantom introduced themselves to each toher as both sets of twins talked about their adventures with each ther.
"So, Jen," Dayla said, wringing her hands together. "Remember when I wrote you about that ghost portal accident Danny and I had in our parents' lab over two years ago and you couldn't believe we pulled through?"
"Wild guess. You didn't pull through?" Jen asked, raising an eyebrow.
"Well... yes and no," Danny admitted. "I accidentally tripped and activated the portal, which infused our DNA with ectoplasm. It effectively turned us half ghosts and half human."
"I don't know what's cooler," Ben said, holding up his Omnitrix. "What happened to you guys or what happened to us."
"That sounds much cooler than just being born half alien," Jen said, lighting a hand up in mana.
"You guys have amazing watches that can let you shapeshift into pretty much anything strapped to your wrists," Dayla said, sitting down with a chuckle. "If you ask me, you're just as awesome as we are," Dayla laughed.
"Wow," Danny said as the Omni-Twins and Phantom Twins shared a laugh. "It's kind of amazing how much we have in common with each other."
"I know, right?" Ben said. "The only thing is that your parents are total genius ghost hunters and ours are pretty much as normal as it gets."
"Yeah, but your grandma's an immortal alien made of life energy and your grandfather's an alien cop. That pretty much evens us out."
After arriving on Vilgaxia, the two sets of twins leaped/flew out of Ship as they looked around at the desolate city before them.
"So..." Sam said, gesturing to Vilgax. "This squid guy..."
"Our arch-nemesis," Jen explained with a sigh.
"So why are you helping him?"
"We can't just sit by while innocent people suffer," Becky said to the others. "No matter who their ruler is."
"It's against our better judgement, but it's our duty," Gwen said. "We're dealing with a lot of ghosts here, guys."
"Coming to us was a good call," Valerie said with her helmet degenerated as she sat down.
"Totally," Andrew said as Kevin looked over.
"We are now completing our descent into Vilgaxia, ladies and gentlemen. Thank you for flying Air Omni."
The back of Ship opened up and the team looked at the desolate Vilgaxia with a look of determination on their faces.
"It's Hero Time!" Ben and Jen said, activating their Omni-Suits.
"We're going ghost!" Danny and Dayla shouted as the white rings appeared around them and split vertically, changing them to their ghost forms.
"Alright," Ally said as the two teams looked the two sets of twins smiling parallel from each other in their hero outfits, arms crossed. Jen faced Dayla and Ben faced Danny, both smiling confident. "Let's see who takes down the bad guys better. Ghosts vs aliens."
"No penalties," Danny said.
"No overtime," Jen agreed.
"We're ready, baby!" Becky cheered as the rest came out with the ghost weapons they had gathered from the lab.
Vilgax stepped out last as everybody looked around.
"You know, Vilgax, this place looked better in the brochure," Gwen stated.
"No kidding," Sam said. "The Ghost Zone looks cheerier than this place on its worst day."
"Zs'Skayr is the cause of all this."
"Got the Fenton Thermos?" Andrew asked as Sam nodded and held it.
"Never go anywhere without one," Sam said as she pecked Danny on the cheek.
"Why did we only bring one though?" Tucker asked.
"Because most of the Ectonurites here aren't really Ectonurites," Vilgax said. "They're just my people who have been possessed by Zs'Skayr."
"Then we won't have to worry about capturing those guys then?" Valerie shouted as she pointed upwards and spotted a bunch of Ectonurites soared through the sky and hissed at the group.
"They haven't spotted us yet. In here," Ben ordered as they all squeezed through a crack in the wall while Danny and Dayla phased through the wall themselves.
Kevin morphed his hands into mallets and used them to slightly plug the crack so the ghost aliens wouldn't see the team.
As they passed, the twins sighed in relief.
"*sigh* We tricked them," Jen sighed.
"That's a relief," Sam said. "But we know we could have taken them on."
"We can't risk Zs'Skayr knowing we're here. Yet," Becky stated.
Suddenly, everyone heard a screeching and held their ears as Vilgax went through the crack.
"What was that?"
"A child crying," Vilgax stated, running away and destroying the wall with it.
"Vilgax, what are you doing?!" Gwen shouted.
"Giving away our location!" Ally shouted.
"Oh, that's okay," Jen said as she pressed her Omnitrix.
"We were getting sick of being nice to him anyway," her brother shouted as they slammed their cores down, transforming in a flash of green and pink light.
"Swampfire!' the Methanosian shouted.
"Kung Fang!" the Chiropterran shouted as she used her echolocation, which bounced off all the walls and back into her large ears.
"Bat ninja?" Andrew asked as Kung Fang unsheathed her katanas from the sheaths strapped to her back. "Nice."
Swampfire used the roots growing from his hands and feet, which sank into a hole in the ground that opened it up tremendously.
"Get in," Kung Fang ordered as everyone jumped/flew into the hole and traveled through the resulting tunnel before popping up on the other side.
"Hey, ectoterrestrials!" Danny shouted as the Ectonurites turned to see the two teams facing them with a smirk. "Tell your boss, the Phantom Twins and the Omni-Twins are coming for him!"
As Vilgax brawled the Ectonurites, Danny and Dayla shouted out and blasted them with green ghost rays from their hands.
"Bring it on!" Dayla shouted with a smirk and a wave of her snow white locks.
Sam shouted out, activating the Spector Deflector around her waist and fired out her ghost blaster as she stood back-to-back with Andrew, who slammed his Ghost Gauntlets together as he slammed a ton of Ectonurites back.
Kung Fang spun her swords around with a shout, kicking back the ghost aliens before letting out her sonic screech that slammed them all back with a flourish.
Swampfire also slammed tons of aliens back with his fire powers and looked to see his and his sister's arch nemesis.
"I can't believe you thought you could trick us that you were..."
He suddenly widened his eyes and his jaw dropped as he saw a female child Chimera Sui Gerenis cowering close by.
"...saving a little girl? Okay, now I feel like a jerk."
"Hey, the big bad of the galaxy has a conscience," Becky stated, slamming back an Ectonurite with her spear as Gwen blasted it into a wall with her mana powers.
"Who knew?"
The twins were suddenly caught by surprise by two aliens that scratched them in the chests, specifically the Omnitrix symbols that glowed yellow for a few seconds afterwards.
Dayla blasted back with a fire blast from her hands as Danny fired an ice blast to knock them back as the two sets of twins dropped by Vilgax as he blasted the aliens back with his laser vision.
"Don't let them reach her. The Ectonurites can possess anything they touch!"
"Including us?" Ally asked as she socked an alien back with her rock fist.
"Not a problem for me!" Valerie shouted as she activated the turrets on her hoverboard and they blasted the Ectonurites flying above the group.
Swampfire slammed the ground, creating a large plant in the clearing that wrapped around two Ectonurites, destroying them.
"Nice! I wasn't even sure that was a plant," Swampfire shrugged.
Soon, an Ectonurite snuck behind Kevin and phased into him.
"Kevin!" Gwen shouted.
Kevin shouted out and the Ectonurite immediately phased out of him.
"Great. Even the freaks don't want me."
"Kevin," Ally put a hand on his shoulder.
"Actually, that's a good thing in this case!" Tucker shouted, blasting away with the Fenton Bazooka.
"Stay up front, Kevin!" Sam shouted, slamming away with the Fenton Anti-Creep Stick.
Kevin groaned and ran to the frontline.
"Leave! Her! Alone!" Kung Fang shouted, swinging her katanas with each word, destroying an Ectonurite each.
Dayla and Danny blasted away with ghost rays, fire blasts and ice blasts each as Kung Fang sent out a flurry of shuriken that destroyed all of the Ectonurites they hit while Swampfire blasted away with a wave of fire.
Becky fired a flurry of arrows that destroyed every Ectonurite they hit.
Soon, the ghost aliens grew scared and flew away.
Vilgax walked up to the child and knelt down to her.
"Are you injured?"
"No, my Lord Vilgax. Thank you, my Lord Vilgax."
"It is not safe here. Stay inside and be quiet."
After hugging Vilgax, the child ran inside while Ben and Jen chuckled after transforming back.
"You are so losing your evil cred," Ben chuckled.
"Watch your tone, Ben and Jen Tennyson," Vilgax said, grabbing his sword. "If I did not need your help."
"There's the Vilgax we all know and loathe," Jen said, crossing her arms.
"You guys are as awesome as they say you are," Danny said, flying up to them.
"As are you," Jen said as the two sets high-fived.
"What's next? Find some puppies that need saving?"
"We only have one objective: eliminate Zs'Skayr. Without his mental control, his minions will become powerless."
"Where do we find him?" Tucker asked.
"Easy guess. He's got to be in Squidface's crib," Ben said.
"My castle? Yes, it is well fortified."
"That freak hasn't encountered these two before," Jen said, gesturing to Danny and Dayla, who smiled and nodded.
"Let's hit him with his own medicine," Ben said, slamming his fist into his hand.
"We are ready," Danny said.
"What about the rest of us?" Gwen asked.
"You take care of his minions while the four of us take on Zs'Skayr," Dayla said. "He's too powerful for you."
"Understood."
"But how do we get into the castle without Zs'Skayr knowing it?" Ally asked.
"Vilgax, do you have a secret key hidden beneath a rock somewhere or something?" Becky asked.
"I get your meaning. Yes, there is a secret entrance into my stronghold. But I should warn you. It is not pleasant."
"Seriously?" Andrew asked, disgusted as Jen, Gwen, Danny and Dayla illuminated the room. "The trash chute?"
"You agreed to come with us, hon," Dayla said as Andrew groaned.
"The things I do for you, Dayla. Honestly."
"Oh, you," Dayla said, kissing his cheek.
"You should be grateful I called off the flesh beetles," Vilgax said as everyone climbed/flew up the chute.
"Zs'Skayr seems to have a real grudge against you, Vilgax," Gwen said.
"Nonsense. He simply sees my planet as the jewel it is."
"'Jewel?'" Kevin asked as some slime dripped onto him. "Even better."
"Once we get this guy into the Fenton Thermos where he belongs, we can find out what he really wants from you," Danny said.
"You guys seem confident."
"We have a plan, don't worry," Jen said as she shot the Phantom Twins a wink.
Soon after, the team reached the top of the castle and looked around, and the Ectonurite the were searching for was nowhere to be seen.
"Come on?!" Danny shouted as he flew into the air. "Where is this big bad you guys talked about?"
"I don't get it," Dayla said. "If you needed us for this so bad, where is he?"
"He's got to be here," Ally said, getting ready.
"If we know this guy, this welcome's going to be a lot less inviting and a lot more painful," Becky whispered.
"I feel that," Valerie said, quickly getting her large blaster ready.
"Alright, Zs'Skayr, let's get this over with!" Jen shouted as she and Ben walked up to the center while the rest of the team covered all other sides as their anger grew
as Danny and Dayla flew directly above them, hands glowing green with ecto energy. "Zs'Skayr!"
"Come on! Quit hiding and show your creepy little face!" Ben shouted.
"Little Ben and Jen. My how you've grown," Zs'Skayr smirked as he suddenly appeared in front of the team. "And who might you two be?"
"Danny and Dayla Phantom," Danny answered, hovering next to Danny as his sister did the same with Jen.
"We've taken on our share of ghosts over the years," Dayla said with a glare. "But you easily take the ugly cake."
Vilgax then stepped out behind the two sets of twins and unsheathed his sword.
"Ah, Vilgax. You're back for more."
"This time, you will die, Ectonurite scum!"
Zs'Skayr shot a purple energy blast from the tentacles that Vilgax blocked with the Shield of Seagle.
Danny and Dayla shot out their ecto blasts from their hands as Ben and Jen transformed into Lifeforce and Sight Strike.
"Okay, freak!" Lifeforce shouted. "What's your endgame?"
"You're only delaying the inevitable, Omni Twins."
"And Phantom Twins!" Danny added.
"Before I enslaved this planet, as I will the universe, all I needed was a place to start. Even now, my minions are building starships to infest other worlds. Now that you are here, I wouldn't mind possessing your power as well."
"I'd like to see you try!" Sight Strike shouted as the eyes around her body merged into a single eye on her chest that she used to blast out a powerful pink energy blast as Lifeforce blasted out his best mana beam that combined with Danny and Dayla's beams as Zs'Skayr shouted out and screeched loudly.
Several Ectonurites flew towards the tower as the others came in.
"Now!" Valerie shouted as she opened fire from all of her armor's weapon sockets towards the Ectonurites before flying off.
"This is fun!" Kevin said, swatting an alien back with a mace hand as Gwen blasted forth with a spell blast that blasted a minion back.
"Never teamed up with an entire other superhero team before," Sam said, blasting forth with her Fenton Wrist Rays.
"I know. It's kind of awesome!" Andrew said, swatting an alien back with his Ghost Gauntlets.
Tucker dodged a claw strike before ensnaring another alien with the Jack o' Nine Tails, which Becky immediately stabbed through the chest with her spear, causing it to vanish.
"So, what's tougher?" Ally asked, slamming two Ectonurites' heads together, causing them to vanish. "Aliens or ghosts."
"That's a tough one," Valerie said, dodging everything that came at her with a shield from her glove. "Both are really tough in different ways."
"Clearly," Becky said, aiming her bow behind her and destroying an Ectonurite without even looking at it.
Zs'Skayr lifted his hands and everyone looked upwards to see the large roof with the Vilgaxian symbol on it come down on them.
Danny and Dayla quickly turned intangible and phased through it, but the Omni-Twins weren't so lucky as it crumbled down on them and Sight Strike and Lifeforce stepped out, dazed and confused.
"Ben! Jen!" Gwen shouted, concerned for her cousins.
"Ugh," Lifeforce said within the rubble.
"Ben, how many fingers am I holding up?" Danny asked.
Lifeforce simply flipped the male Phantom Twin the bird.
"He's fine," Danny sighed, lifting him and Sight Strike out of the rubble.
Vilgax shouted out and brawled Zs'Skayr with his sword, causing the alien to block with his claws as the Omni-Twins shook off the damage as Lifeforce and Sight Strike turned their Omnitrix symbols and transformed into...
"Heatblast!"
"Discharge!"
The Ectonurite levitated a pillar towards Vilgax, that he simply ran through with his sword, reducing it to a pile of rubble as Zs'Skayr dodged and phased through everything Vilgax threw at him.
It seemed that the Chimera Sui Gerenis was getting the upper hand until Zs'Skayr grabbed his neck with his tail and tossed him back.
Danny shouted out as he flew from above and blasted Zs'Skayr back with a fire blast that Heatblast combined with his own flames as Discharge popped up behind him.
"Hey, One Eye!" she said, wrapping him up with her tail. "Two sets of twins can be shocking, huh?"
That was when she immediately charged her static powers up and violently shocked Zs'Skayr before he blasted her back into Dayla's arms.
"You okay?"
"It's all good."
"Okay, this has gone on long enough!" Danny shouted as he and Dayla flew down on one side of Zs'Skayr as he blasted Vilgax into the rubble from the roof and Heatblast and Discharge landed on his other side.
"You two halflings think you can defeat me?! Who do you two think you are?" Zs'Skayr snarled as Danny and Dayla smirked to each other with a nod.
"Since you want to know so bad, here's our calling card!" Dayla shouted.
"You guys might want to cover your ears," Danny warned as everyone covered their ears.
That was the instant that the Phantom Twins inhaled and gave out their loudest shouts, sending out their powerful Ghostly Wails that slammed into Vilgax at full force.
"Not gonna let you have all the fun, ghosts!" Discharge shouted with a giggle, appearing behind Vilgax in a surge of electricity before she blasted him back with her best lightning blasts.
"This is how we roll!" Heatblast shouted, also blasting Ghostfreak from behind with his fire.
Zs'Skayr panted and hit the floor with a groan.
The two sets of twins smirked at each other with a nod as Ben smiled.
"Shall we do honors?" Jen asked as Danny smiled and tossed his Fenton Thermos to Ben.
"Be our guests," he said with a bow as Ben caught the thermos and pointed it at Zs'Skayr with a smirk as Jen laid her hand on top of his and added her energy to it.
"See ya, sucker!" Jen shouted as she and Ben blasted Zs'Skayr with the thermos' beam, which started sucking Zs'Skayr into the thermos.
"No! No! NOOOOO!" Zs'Skayr shouted as he was finally sucked into the Thermos and Ben slammed the lid on the top with a fist-pump.
"Boo-ya!" Ben shouted as he and Jen fist-bumped before high-fiving and hugging each other.
"We did it!" Dayla cheered as all of the Ectonurites vanished and the people of Vilgaxia appeared below the tower.
"We couldn't have done it without you guys," Jen said, handing Dayla the Fenton Thermos.
"No you couldn't have," Sam said, giving Danny a massive kiss while Dayla did the same to Andrew as the team finished up as Ship flew in towards the tower, prepping to leave.
"Long live Vilgax! Long live Vilgax!" the Vilgaxians cheered from below the tower as Ben, Jen, Danny and Dayla groaned outwards.
"Oh come on! We're the ones who saved the planet," Jen groaned.
"I do not presume to take credit for you or your friends' deeds, Ben and Jen Tennyson."
"Oh, we're not telling anybody," Danny said as Ben winked.
"What happens in Vilgaxia stays in Vilgaxia."
"Let's get out of here," Valerie said as Danny held the thermos in hand.
"Zs'Skayr is going to make some nice friends in the Ghost Zone," Dayla winked.
"Yes," Vilgax said to the teams. "You have helped me achieve my goal and so you have won your miserable lives."
"Fine," Ben said. "But our truce is over."
"The next time we see you, you're going down," Ben said. "We're never going to help you again."
"Nor do I expect you to."
Ship then immediately took off.
"This is not over, Ben and Jen Tennyson. In fact, now that the secrets of the Omnitrixes are mine and there are none left to stop me, I'd say it's a rather auspicious beginning," Vilgax grinned to himself.
On Ship, the team were all chatting to each other and exchanging contact information.
"So, you guys are the real deal," Danny said as he and Ben bro-hugged.
"You guys are too," Jen said as Dayla grinned.
"If you guys ever need anything from us, just call."
"You as well," Ben said. "Well, this was a rather successful mission."
"Zs'Skayr is history and we made some new friends," Jen agreed, sitting back in her seat.
"So, how was it teaming up with other heroes," Becky asked, next to her sister as Valerie and Sam grinned.
"That was one of the coolest things we've ever done," Sam said. "And we've saved Earth and the Ghost Zone before."
"We saved the entire universe on multiple occasions," Gwen chuckled.
"Yeah, but Ben and Jen don't have statues of them erected in every major city in the world," Tucker chuckled.
"Not yet, we don't," Jen said.
"But that's just because the world doesn't know how many times we've saved it yet," Ben said. "Our identities are still secret."
"That explains the masks," Andrew said, taking note of the team's costumes.
"Still nice to know I have an awesome pen pal," Dayla said, jabbing Jen's shoulder.
"And so do I," Jen said as Ship flew into the distance.
Next time on Ben and Jen 10:
Trade-Off