Ch.1: Into Another World

A superhero's life had its ups and downs. Many superheroes have come and gone. Some were born with superpowers and some got superpowers. In Ben Tennyson's case, he got his superpowers at the age of 10 when an alien device, known as the Omnitrix, crash–landed on Earth and was found by Ben. The Omnitrix gave its wielder the power to transform into various different aliens and Ben used their powers fight evil from Earth or space, from bank robberies to intergalactic warlords and alien invasions. At first, Ben had access to just 10 aliens, but throughout the years, he got more and more aliens. Unfortunately, Ben had to destroy that Omnitrix to prevent his arch nemesis, Vilgax, from using it. That's when he got the Ultimatrix from his evil doppelganger, Albedo, which also allowed him to evolve some of his aliens, like Big Chill, Echo Echo, Cannonbolt & Way Big, into their ultimate forms. From that point, Ben's superhero life was no longer a secret and he was known throughout the Universe. After his battle with Diagon, Ben received the original Omnitrix from Azmuth and continued to do his duties as a superhero.

Now, after his battle with Maltruant, Ben's superhero adventures got less and less. Every evil being feared him, as he had access to aliens like Way Big, Atomix, Feedback and full control of Alien X.

However, just because he wasn't needed that much in this Universe, doesn't mean that he wasn't needed in another one, and this is where his newest adventure begins.

Ben opened his eyes and saw that he was in a dark alley.

"Where the heck am I," Ben asked himself as he dusted off his white hoodie and made his way out of the alley before looking around. "This is definitely NOT Bellwood."

Ben leaned against a lamppost and thought of what happened to get here.

(FLASHBACK)

Ben and his partner, Rook, were on a patrol around Bellwood when they recieved a call from Max, informing them that Albedo has been spotted in an abandoned warehouse at the outskirts of Bellwood.

When they got there, Ben cycled through his aliens before making his choice, and transformed into Shocksquatch.

"I'm gonna call for back–up just in case," said Rook.

"Good. You do that and I'll light Albedo up like a Christmas tree," said Shocksquatch before entering the warehouse.

"But, it's the middle of summer," said Rook, confused as he followed Shocksquatch. "This holiday, Christmas, is in 5 months. Why would you need a tree now?"

"It's an expression, Rook," said Shocksquatch with a sigh. "It means that I'm gonna send a few volts through Albedo."

"I think I'm starting to understand," said Rook.

The duo walked further until they reached the main room, where Albedo stood as Ultimate Echo Echo in front of a giant laser.

"Albedo, you are under arrest," said Rook.

"Ah, Tennyson and his slightly smarter partner," said Ultimate Echo Echo as he turned to the two. "I must say that I was expecting you to show up eventually."

"Well, your wish came true. Now, step away from the laser before I kick your butt," said Shocksquatch with a smirk as his fur sparkled.

"I don't think I can do that," said Ultimate Echo Echo before unleashing a sound wave that Shocksquatch and Rook managed to avoid.

Shocksquatch then fired electricity from his hands, but Ultimate Echo Echo blocked it with his super sonic before getting blasted by Rook's Proto–Tool. This gave Shocksquatch enough time to run up to Ultimate Echo Echo and give him an electrified uppercut, sending him crashing into the laser that unleashed a few sparks beceause of the impact.

"Just give it up, Albedo," said Shocksquatch.

"Why would I do that," asked Ultimate Echo Echo before transforming into Ultimate Rath.

"You just don't know when to quit, do ya," asked Shocksquatch before the two aliens charged at each other, trying to overpower the other.

"Let me tell you something, Tennyson! You won't beat me," said Ultimate Rath as he began to overpower Shocksquatch.

"We'll see about that," said Shocksquatch with a smirk before his hands lightened up and gave Ultimate Rath a nasty electrical charge.

This gave Shocksquatch enough time to put some space between them and pressed the Omnitrix on his belt to transform into a different alien. This time being Echo Echo.

"Okay, now I'm really pissed off," said Ultimate Rath as he recovered from the attack.

"Then you won't like this either," said Rook from a distance as he fired an electrical net from his Proto–Tool that brought Ultimate Rath down to his knees.

The distraction gave Echo Echo the opportunity to multiply himself in 8 and surround Ultimate Rath.

"Time to put you down," said Echo Echo. "WALL OF SOUND!"

Echo Echo and his clones unleashed their sonic screams at Ultimate Rath, which caused him to scream in pain due to his sensitive hearing. It wasn't long before he couldn't take it anymore and fell on his stomach before turning back to human.

"Good job, but gave me a warning next time," said Rook as rubbed his ears.

"I'll keep that in mind," said Echo Echo before becoming one again as the Omnitrix timed out, turning him back to Ben.

"I wonder what Albedo wanted to do with that laser," said Ben.

"I called for back–up. The Plumbers will take it to analyze it," said Rook as he handcuffed the unconscious Albedo.

"Good to know," said Ben as he was about to head for the exit when the laser started to unleash huge sparks of electricity. "What's gotten into that thing?"

"It must be malfunctioning from damage it was done to it earlier," said Rook as pointed at the dent on the laser.

The laser began to violently shake as it started to break down, before a small yellow orb started to form above it that began to suck everything in the warehouse as it slowly expended.

"That doesn't look good," said Ben.

"Let's get out of here," said Rook as he picked Albedo up.

"Don't need to tell me twice," said Ben.

The two ran towards the exit when part of the ceiling fell right in front of Ben, stopping him in his tracks. Unfortunately, that caused him to slowly be dragged by the sucking of the yellow orb that was twice the size of Cannonbolt.

"Ben, hang in there," said Rook, who was at the door.

"Forget it, Rook. Just take Albedo to the Plumbers. I'll try to get out of here," said Ben as he activated the Omnitrix, looking for a heavy enough alien that could withstand the pull, but before he could do it he saw a steel pipe falling towards him. He jumped out of the way, but that only caused him to be pulled into the orb, disappearing from view.

"BEN," shouted Rook.

He was about to go after him, but the orb exploded, sending the Plumber flying into his Proto–Truck. When he opened his eyes, the whole warehouse was gone and in its place was nothing but a giant crater.

(END OF FLASHBACK)

"Well, at least Rook's okay and Albedo's captured, so that's a slight relief. Now, the only question is, where the heck am I," Ben asked himself.

Just then, a wagon pulled up and a girl with blonde hair and eyes came out of it. She was wearing a blue and white dress along with white boots.

"Excuse me, are you lost," asked the girl.

"Yeah, you can say that," said Ben as he rubbed the back of his head.

"Well, if you need some place to stay, you can come home with me," said the girl.

"Did this girl just invite a stranger to stay at her house," Ben thought to himself. "I guess it wouldn't hurt. Plus, it's pretty dark and I may need some place to stay."

"Great, then it's settled," said the girl as she dragged Ben towards her wagon.

A few minutes later, Ben and the girl, who introduced herself as Aria, arrived at her place and Ben was in awe at the size of the mansion. When they exited the wagon, they were greeted by Aria's parents, who appeared to be very welcoming.

"It looks like Aria brought home another guest," said Aria's father.

"It would appear so. How many does this make," asked Aria's mother much to Aria's embarrassment.

"Thanks for letting me stay here," said Ben.

"No problem, but why were you out on the street so late," asked Aria's mother.

"Yeah, the thing is, I have no idea. I don't remember anything before waking up in a dark alley and meeting Aria. The only thing I know is that I'm pretty far away from home," said Ben. "If I'm not mistaken, I'm in another dimension, which means I can't tell these guys about the Omnitrix. They'll think I'm crazy or something."

"You poor thing," said Aria's mother.

"It's a good thing Aria found you then. You don't know what kind of monsters lurk around the Capital at this time of night," said Aria's father. "It's a good thing you didn't run into Night Raid."

"What's Night Raid," said Ben, confused.

"They're a band of assassins that terrorize the area. As the name implies, they attack at night. Their targets are mainly high–ranking officials and the upper class," said Aria's father before looking at Ben with a serious expression. "If you get targeted by them, no doubt you'll be dead. In this place it's kill or be killed. There's just no other way."

"That sounds a little disturbing," said Ben as he shivered at thought of encountering Night Raid. "This dimension is crazier than the last one I've been to. I don't want to kill people, but I might not have another choice if that's the only way to survive."

"Don't worry about a thing. The guards we have are professionals, so Night Raid doesn't stand a chance if they come here," said Aria's father.

"Well, that's a relief," said Ben with a sigh. "Something tells me I'm gonna meet this Night Raid pretty soon."

Later that night, Aria's mother was walking down the hallway when she was suddenly cut in half. Standing behind her was a young woman with purple hair and eyes, dressed in a revealing, sleeveless lilac cheongsam with detached lilac arm sleeves and white boots.

"I'm sorry," said the woman.

In another part of the mansion, Ben woke up due to the commotion, put his hoodie on and opened the door.

"Something's not right," said Ben as he activated the Omnitrix. "I'm gonna need some stealth for this one."

Ben cycled through his aliens before pressing the core down on the alien he wanted, engulfing him in green light. When the light faded, in his place stood a large purple salamander with darker purple camo-esque spots all over his body, a short tail and small black spikes across his back that connected his dark green pants and two green sashes across his chest. He also had a black helmet with three triangular colored lenses, the left one being blue, the right one was red and the middle was green. The Omnitrix symbol was connected to the two sashes on his chest. This was Ben's Merlinisapien form, ChamAlien.

"ChamAlien? Wow, I haven't used this one in quite some time," said ChamAlien before he changed his color and ran around the hallway. "This has to that Night Raid Aria's parents told me about. I knew I'd meet them soon, but not this soon."

ChamAlien continued making his way through the hallway until he reached a window through which red light was coming. ChamAlien stopped for a moment and looked at five people standing on red wires in the air.

"If that's not Night Raid, then I'm not a superhero," ChamAlien muttered to himself. "But what shall I do? Help the guards or protect the family?"

ChamAlien watched as three guards came out while two members of Night Raid landed on the ground. One of them was a girl with black hair and red eyes and the other was wearing silver armor. The guards charged at them, but the girl brought out her sword and slashed one of the guards before he could do a thing. Another guard tried to sneak up on her, but was stopped when the armored figure threw a spear through him. The third guard tried to escape, but was shot down by a girl with pink hair and eyes.

"These guys just got wiped out in seconds. These Night Raid fellows are no messing around," said ChamAlien before looking at the pinkette's weapon. "I can already tell that Kevin would do anything to have a bazooka like that. Get yourself together, Ben. I've got to find Aria."

In the forest, a guard was leading Aria to safety.

"Hurry, my lady! This way," said the guard.

"What's happening," asked Aria.

"Just get to the shed for now. It'll be safe there," said the guard as they neared a shed.

Just then, the girl with black hair and red eyes landed behind them.

"Damn it", said the guard as he began to repeatedly shoot at the girl, but she was able dodge the bullets with her speed.

"You're done," said the girl before slicing the guard in half.

Aria stared in fear before falling on her butt as the brunette stood above her.

"You deserve this," said the brunette as she was about to slice Aria, but got punched in the face by an unseen force. She did a back-flip and landed on her feet.

"Sorry, but that's not happening," said a mysterious voice before ChamAlien showed himself in front of Aria, smirking at the brunette. "Bet you didn't see me coming, did ya?"

"Move aside, danger beast! You're not a target for now," said the brunette.

"And why would I wanna do that? So you could kill an innocent girl," asked ChamAlien.

"Uh huh," said the girl with a slight nod.

"What kind of a response is that," asked ChamAlien as the Omnitrix timed out, turning him back to Ben, much to the two girls' shock. "I mean, seriously? Who can just tell like that they're gonna kill someone?"

"I don't want to kill you, but I will if stay in my way," said the brunette.

Meanwhile, another girl was approaching the scene. She had long blonde hair, golden eyes and lion ears. When she got to the scene, she had a surprised expression.

"Now that's rare for Akame. She still hasn't finished them off yet," said the girl before looking at Ben standing on front of their target. "And what do we have here?"

"Hey, Leone! What's taking Akame so long," said another voice.

Leone turned around and saw the other members of Night Raid.

"Come and take a look," said Leone as she gestured for her comrades to look at Ben standing protectively in front of Aria.

"Is that boy our target," asked the girl with pink hair.

"No, but I wonder what he can do against Akame," said Leone.

"I can't tell if he's either very brave or very stupid to go against Akame," said a boy with green hair.

"Stand aside," said Akame as she lifted her sword, threateningly.

"Not happening," said Ben as he activated the Omnitrix and began cycling through his aliens. "Besides, since you like swords so much, how about I introduce you to Diamondhead?"

Ben pressed the Omnitrix's core down, engulfing him in green light. When the light faded, in Ben's place was standing a large muscular werewolf with gray fur, a long flowing mane and a long bushy tail with four sharp claws on each hand and foot. He was wearing green suit, collar and wristbands. The Omnitrix symbol was on the collar above his fur. This was Ben's Loboan form, Blitzwolfer.

"Blitzwolfer? That doesn't even sound like Diamondhead, you stupid watch," complained Blitzwolfer.

Akame and the rest of Night Raid were in shock at the sudden change.

"Well, I didn't see this one coming," said Leone in awe at Blitzwolfer.

"Just how did he do it," asked the girl with pink hair.

"No idea, Mine. Let's watch and see what it happens," said the armored figure.

"So you can turn into more danger beasts than just a chameleon," said Akame before jumping in the air. "You'll be eliminated!"

"Don't think so," said Blitzwolfer as he split his jaws in four and unleashed a sonic howl that struck Akame.

Despite getting hit, Akame was able to land on her feet and dashed towards Blitzwolfer.

"Talk about cute, but dangerous," said Blitzwolfer as he used his reflexes to avoid Akame's slashes before kicking her in the chest to get some space between them.

"Wow, no one has lasted this long against Akame," said Mine. "I have to admit,he's pretty impressive."

"You're not the only one to think that," said the armored figure.

Akame charged at Blitzwolfer once again, but the Loboan dodged her sword strike before biting her arm she was holding the sword with, causing her to scream in pain and drop the sword. Blitzwolfer then used his superior strength to pin her on her ground with his right paw pressed against her chest while his left foot was pinning both her feet, completely immobilizing her.

"Alright, you pinned me. Now do your worst," said Akame as she starred Blitzwolfer in the eyes.

"Nah, I kill only when every other option doesn't work," said Blitzwolfer, confusing Akame. "I'm gonna let you go, but before that I want you to answer me a question."

"I'm not telling you anything," said Akame.

"Just hear me out. I want to know, why would you kill an innocent girl," asked Blitzwolfer.

"Okay, I think that's enough," said Leone as she and the others approached the two.

"Oh great. The rest of the gang," said Blitzwolfer as he got ready to defend himself while still pinning Akame.

"Easy, big guy. I'm not gonna fight you and neither will they," said Leone as she walked pass Akame and Blitzwolfer, and towards Aria, who couldn't move a muscle due to the entire Night Raid being here.

"If you're not gonna fight me, then why are you here," asked Blitzwolfer.

"To show you something," said Leone as she kicked the doors of the shed. "When you're done making love with Akame, come and take a look at what's inside."

Blitzwolfer blushed at what Leone said and immediately let Akame go before walking towards the shed.

"You said you won't let Akame kill an innocent girl, right" asked Leone.

"Well duh. I'm superhero and I protect the innocent," said Blitzwolfer.

"Then take a look at this, the dark side of the Capital," said Leone.

Blitzwolfer hesitated a little, but eventually looked inside and his eyes widened at the sight. Inside the shed were several torture instruments, several mutilated corpses hanging from their arms by ropes and the floor was all covered in blood and mutilated pieces of people.

"I was wondering why my nose smelt something terrible," muttered Blitzwolfer, but it was still loud enough for everyone to hear. "What is this place?"

"They lure unidentified people who came from the country with their sweet words before torturing them to death for their own sick twisted entertainment," said Leone. "That's the reality of this poor little twisted family."

Blitzwolfer then saw that between the many dead bodies was a young pretty girl with straight hair and a flower in it. He couldn't believe that teenagers were being tortured and murdered. True, he had faced crazy opponents, like Captain Nemesis and Dr. Animo, but this was on a whole new level.

Aria seized the moment and tried to run away, but stopped in her tracks when she the rest of Night Raid in front of her.

"Don't think we're through with you yet, little lady," said Mine as she aimed her Pumpkin at the girl's forehead.

"The people of this house did this," asked Blitzwolfer.

"That's right. The guards were being quiet about it so they're just as guilty," said Leone.

"It's a lie! I didn't know there was a place like this," said Aria in fear as she turned to Blitzwolfer. "Who are you going to believe? The innocent girl or these killers?"

"It's...a...lie," said a weak voice. Blitzwolfer turned to see the owner of the voice and saw a boy with black spiked hair with a white bandana on his forehead. He was naked and his body was covered in bruises. "The name's Ieyasu and that girl invited my friend, Sayo, and I, and we lost consciousness after we ate. We were here when we came to. That...that girl tortured my friend pretty much to death!"

"What's so wrong about it," Aria suddenly scream as she turned around and faced Blitzwolfer. "You're just worthless hicks from the country, right? The same as cattle! I should be free to treat them however I want! Besides, that girl was so impertinent for having such straight hair for a farm animal." Blitzwolfer could only look in horror at Aria as she spoke. He couldn't believe that her personality had changed from an ordinary, frightened girl to a sadistic demon in a matter of seconds. At this moment, he realized just how cruel this world was. "In fact, she should be grateful I took such care of her!"

"A family of sadists that takes the guise of Samaritans. Akame, you know what to do," said Leone and Akame nodded.

"Hold on," said Blitzwolfer in a low voice, but still loud enough for everyone to hear him.

"Don't tell me you still want to defend her," said Mine in disbelieve.

"No," said Blitzwolfer before charging at Aria with inhuman speed and digging his claws right into her chest, much to everyone's shock.

"What do you know? You actually did have a heart," snarled Blitzwolfer before pulling his claws out, with Aria's heart in them.

Aria couldn't do a thing as she fell backwards before dyeing from having her heart ripped out by the Loboan.

"Wow, no hesitation at all," muttered Leone.

"People like you make me sick," said Blitzwolfer as he looked at Aria's dead body before dropping her heart on the ground and stepping on it.

"That felt good to see," said Ieyasu with a weak laugh before vomiting some blood.

"Are you okay, dude," asked Blitzwolfer as he ripped the bars and got Ieyasu out of the cage.

"It's the last stages of lubora disease. The mistress here enjoyed putting people on drugs and wrote how they were doing in a diary," explained Akame.

"Hold on, buddy. We'll get you some help," said Blitzwolfer.

"He can no longer be saved," said Mine and Blitzwolfer's eyes widened at what she said.

"I'm sorry, man. It seems this is the end for me," said Ieyasu. "Too bad. We could've been great friends. But please, if there's any hope, even if it's nearly impossible, try to save Sayo. I wouldn't want her to die."

"I'll do everything I can," said Blitzwolfer.

"Thank you. Also, if you see a boy with green eyes and brown hair, around our age, named Tatsumi, let him know what happened," said Ieyasu. "He was supposed to come with us, but got held up at our village."

"Don't worry about a thing. I'll make sure Sayo lives and let Tatsumi know about what's actually going on," said Blitzwolfer as he held Ieyasu's hand.

"One more thing. Before I die, could you tell me your name," asked Ieyasu.

"The name's Benjamin Tennyson, but I prefer to be called Ben," said Blitzwolfer. "But I go by Blitzwolfer now."

"Well, it was nice to meet you, Ben/Blitzwolfer," said Ieyasu before he died.

"What is wrong with this world," asked Blitzwolfer in a sad voice as he gently placed Ieyasu's body on the floor.

Night Raid could only watch pityingly at Blitzwolfer as he went up to Sayo and placed his ear against her chest to check if she was still breathing, and indeed there was a small pulse. He didn't waste any time and quickly cut the ropes on her wrists before the Omnitrix timed out, turning him back to Ben.

"What are you gonna do," Leone asked Ben.

"First, I'm gonna get this girl some help and then, I'm gonna find out who lets crimes like these to go unpunished and make them wish they never existed," said Ben angrily as he held Sayo bridal style.

"You know, we could need someone like you in the team," said Leone, shocking her comrades. "We want to bring the Prime Minister down as he's the one responsible for every horrible thing happening here, so you can help us with that by becoming a member of Night Raid. Plus, we can take the girl to a medical facility."

"If you guys are fighting for the good of the people and if Sayo gets a chance to live, then I'm in," said Ben with a determined expression. "For the record, this was the first time I've ever killed someone, so I'll need some time to adjust to the whole 'kill or be killed' thing."

"Understandable," said Akame before turning to the others. "The mission's complete. Let's return to base and treat Sayo's injuries."

The others nodded before departing as Ben cycled through his aliens before slamming the core, engulfing him in green light. When the light faded, in his place stood an alien that had a bug/insect body and four insect-like flat legs with two arms, whose hands were human-style ones with three clawed fingers. He had four small eyes on long stalks connected to his large head. His wings were light green and very fragile with lines on them, and his limbs were a brown-greenish color. He had a long tail and was wearing a green jumpsuit. The Omnitrix was located on his forehead. This was Ben's Lepidopterran form, Stinkfly.

"Wait up," said Stinkfly as he flew after Night Raid to their hideout.

"In just how many danger beasts can you transform into," asked Akame as she and the others were surprised to see Stinkfly.

"What's a danger beast," asked Stinkfly as he flew next to Leone.

"If you're not a danger beast, then what are you," asked Mine.

"Look, let's just make sure that Sayo lives another day and then I'll tell you everything about myself," said Stinkfly. "How does that sound?"

"I suppose it's fair," said Leone. " And don't worry. I'll go back later and bring Ieyasu's body to the hideout so he can have a proper funeral."

"I think Sayo would appreciate it," said Stinkfly with a smile before looking ahead. "Good going, Ben. You just joined a group of assassins and even killed a person. I always thought that bad guys could change, but I guess the evil–doers in this place will need to be put down. I guess Aria's father was right about one thing, this place is full of terrible people, but it's not Night Raid who are the bad guys. That Prime Minister freak show is the main reason for all the suffering and I'm gonna bring him down. He'll pay dearly for everything he has done. And when that's done, I'm gonna try to find a way back home. I just hope grandpa, Gwen, mom, dad, Rook and the others will be alright without me for a while."

To be continued...

Hey, everyone. Welcome to my newest story. I've seen multiple Ben 10/Akame Ga Kill crossovers, so I decided to make one myself. Now, a few things I'd like you to know about this story:

1. Ben will be paired with Mine and Akame, but let me know if you want me to add other girls, except for Esdeath. Don't get me wrong, I actually like Esdeath. It's just, a friend of mine kind of resembles her. Not by looks, but by the fact that he's 25 and is falling for teenage girls, which I personally find a little creepy. So, yeah. Esdeath won't be paired with Ben, but that doesn't mean she can't be paired with Tatsumi.

2. Ben will be part of Night Raid and will eventually kill people.

3. Just because the story will be mostly based on the anime, where pretty much everyone dies, doesn't mean it'll happen here. Beside Ben, Akame and Najenda, I plan on keeping 3 other members of Night Raid alive. And yes, Mine is one of them.

4. As for Ben's aliens' appearances, most of them will have their Omniverse designs, like Shocksquatch, Blitzwolfer, Stinkfly, Ripjaws, Brainstorm, Goop, Way Big, Arctiguana, Jury Rigg and Swampfire, while others will have their UAF appearances, like Humungousaur, Big Chill, Lodestar, Echo Echo and Chromastone. Also, Jetray and ChamAlien will appear how I imagined them in their Omniverse designs.

5. Tatsumi will appear later on. Most likely before the battle against Esdeath's Three Beasts. He'll still obtain Incursio and will be part of the Revolutionary Army, but won't be part of Night Raid.

6. Ben will obtain the Evolutionary feature soon.

7. One of Ben's enemies will eventually join the Jaegers.

Well, that's pretty much everything. Now, I decided to upload the first 6 chapters at once, so that should be enough until the next set, which I'll try to upload in spring.

R&R