AN: I do not own Naruto nor the Justice League.

Plot: Captured and forced to fight as a gladiator for his life, Naruto had often thought about giving up and letting his nightmarish life end. It was only one wish that had kept him going, one hope, as distant and impossible as it seemed: to take the tyrant oppressing him to the grave first.

Note1: This story has the Justice League Animated Series at its base (but not only). This is a dark fic. All the events in Naruto's past are canon-compliant up to the start of the 4th Shinobi War. That means no Kyuubi-mode for Naruto or the power-ups that followed after that - so his power level is limited to the abilities he had during his fight against Pain minus the summoning technique.

Note2: The power level of the DC characters will be the one depicted in the DCAU (DC animated universe), not the overall comics. That means that stuff like Superman destroying a Solar System with a sneeze will not happen. Some of the comic versions of the characters in DC are simply too overpowered compared to the power level of Naruto's world. Therefore, for the sake of this crossover, the power level of the characters in DC will be limited to DCAU mostly.

Pairing: Naruto/Wonder Woman

Chapter 1 - Warworld

"Life functions still active."

"Incredible!"

The ones speaking were two red-skinned extraterrestrial beings at the board of an immense spaceship. Through the reinforced glass of the ship's control room, the desolate scene of a destroyed planet could be seen. Chunks of rocks of all sizes were floating in the space aimlessly like an asteroid belt but much, much denser. However, among the countless remains of the destroyed planet, a living creature was drifting unconscious. They looked like a human being, a male.

"How could he have survived through something like that?!"

There was disbelief in the voice of the one that looked like the ship's commander. From the energy readings that his technicians were getting it seemed as though the planet's destruction had been rather recent, only a few weeks before. To think that that man had survived the destruction of a planet - the commander could not accept that hypothesis as true. And since there was no sign of a shipwreck anywhere around he could only suspect that the man had been thrown off from some ship. Nevertheless, for someone to survive in space with no oxygen and no protective equipment against the freezing cold was surreal.

"Bring him aboard!"

A blue ray of light came from the ship and the human-looking creature was sucked aboard the spaceship.

⁂

"What can you tell me about his species?" the commander asked one of his subordinates a few hours after the survivor had been brought aboard.

The man in question revealed an uncomfortable expression.

"We don't know."

The commander was not angry. Just very surprised. One had to know that since they were tasked with capturing rare and powerful beings throughout the Universe, he and his crew were experts in the field. They were familiar with most if not all the sentient species that had been discovered until then.

"Come again?"

The subordinate replied:

"He looks like a human from Earth and his organs and body structure are almost identical too. But his bones and muscle fibres are much denser and durable. It also wouldn't make sense for a human to possess that kind of survivability. His genetic information does not match that of humans either."

The commander fell deep in thought.

"Is he, perhaps, a Kryptonian?"

He knew that Krypton had been destroyed a few years before but Kryptonians and Humans looked almost identical as well. It would be believable if the one that they had rescued/captured turned out to be a Kryptonian. They were famous throughout the Universe for their marvellous abilities and power.

"It does not match the data we have on Kryptonians either. As far as I know, we've just discovered a brand-new sentient species... or the last individual from it."

A smile appeared on the commander's face when he heard the scientist's words. They had scoured many sectors of the known Universe for years. Today was the first time that they had discovered a new species of sentient lifeforms.

As of late, under the pressure of their supreme leader, in order to find powerful specimens, they had started to thread the 'borders' of the known Universe and even delve into the outer edge of the vast and limitless, forbidden void - a place filled with unusual energies and magnetic waves which spawned randomly and rendered all types of technology useless. They were risking their lives just by being there. Because one such energy wave could kill the engines of their ship and fry up all the tech on board. In a second, they could be stranded in a forsaken corner of the Universe, with no means of getting away or contacting the world outside for help.

But now, it looked like their efforts and the risks they had taken had not been in vain. Their supreme leader would reward them handsomely.

⁂

"I won't fight. Kill me. I have nothing left to live for anyway." a young man said, his voice and eyes empty of emotion. He was talking about his death as though he was talking about the weather.

Opposite of him, a yellow-skinned being with a massive and muscular physique, a bald head and red eyes chuckled maliciously.

"Nobody can go against my words on Warworld! If you continue to resist me, you will find out that living can be way worse than death."

Then, turning to the advisor standing at his side, he said:

"Arrange for him to be re-educated."

The advisor's red-skinned face turned a shade paler. But he hastily expressed his obedience.

"Yes, Great Mongul!"

Tightly secured in metallic cuffs and wires and surrounded by robots, the young man was led deeper into the facility. Soon, anguished screams of pain could be heard.

⁂

"Hoho, you truly are resilient. This isn't anywhere close to too much for you, is it?" Mongul said in amazement.

The young man that he had sent to be 're-educated' had suffered through that procedure for weeks. Every day, he had been tortured in various ways as his captors tried to break his will and make him submit. They were experienced at it - it was not as though it was the first time they were doing that. There had been other creatures that Mongul had captured before that had initially refused to fight as well. But, in the end, almost all of them submitted after being 're-educated'.

The young man's previously flawless skin was currently littered with deep bloody wounds and burn marks. Even one of his eyes had been gouged out and blood was gushing out from his empty socket. However, a crimson red light began to glow around his body and, at a speed visible to the naked eye, his terrible flesh wounds started to close up. The burn marks began to recede without leaving a scar behind and even the gouged-out eye was being regrown.

"Looking at your unbelievable healing factor each day I'm getting more inclined to believe that you were not just dropped off from a spaceship but that you actually survived the extinction of your planet, of your race."

When he heard Mongul say those words, the young man started to struggle fiercely in his bonds and the special alloy metallic casts even showed signs of cracking. The red light that they had seen previously heal him up many times appeared around his body once more, empowering him. But in the next moment, arcs of electricity coursed through the bonds that were tying him up and the young man wailed in agony. Eventually, he stopped resisting.

"We've had stubborn prisoners like you before, those with powerful bodies on which traditional torture methods did not work. But there is always a way to break them."

He made a sign with his hand at one of his subordinates and the person in question came with a large jar containing something that looked like a mass of flesh and tentacles.

Mongul opened the jar and grabbed the thing inside with his bare hand but he was careful to keep it at a distance from his head.

"It looks like you cared a great deal about your home planet. It must have broken your soul to see it burn under your eyes," he said and chuckled evilly. "What if I gave you the opportunity to relive that agonizing moment all over again?"

"I present you the Black Mercy. It's a mutated version of the original, my very own speciality. The original was designed to give someone the illusion of a perfect world where they achieved what their heart most desired. But my Black Mercy is the complete opposite of that. It will make your relive your most painful and traumatising memories and even fabricate new ones based on them. I am absolutely sure you will grow to love it!"

Then, he brought the mass of flesh and tentacles to the prisoner's head. As the tentacles started to wrap around the young man's neck and torso Mongul laughed out loud in dark amusement.

⁂

Several months after the discovery of the new human-like species, the commander responsible for it was back at it, doing his job like usual: searching for and capturing powerful sentient creatures to fight in the arena on Warworld. Now, he was on his way back from another capture. It looked like they had had a great haul if the satisfied expressions on his and his crew's faces were anything to go by.

Suddenly, a specific beeping sound was heard, indicating an incoming transmission. When he pressed a button to connect with the caller, a large hologram appeared. It was none other than Mongul, the overlord of Warworld.

"Captain! I want you to hear something." Mongul drawled.

Then, the loud boos and screams of a crowd rang.

"They're expressing their disappointment at the last specimen you brought," he said slowly.

"Great Mongul, please-"

"A dozen creatures you've found and not one of them has been able to last more than 2 minutes with the Voidfiend!" Mongul said angrily.

"I promise! The next one will be different!" the commander said but Mongul made a sceptical face.

The ship's commander explained:

"He's a powerful Kryptonian! Guaranteed to give the Voidfiend the fight of his life!"

"He better!" Mongul ended the transmission with a threat.

By Warworld planet's time-measuring standards, around half a year had passed since the discovery and capture of the new specimen. After a few weeks of physical and psychological torture as well through the use of the mutated Black Mercy, Mongul had finally managed to break the prisoner's will and make him fight in the arena. And from the first moment when he had stepped into the gladiator arena, he had never lost a fight. Not even one.

They did not know his name or the name of his race because the prisoner refused to say it. Not even torture worked on squeezing that information out of his mouth. It was though that was the last vestige of himself that the prisoner was not willing to give up on no matter the cost.

Regardless, seeing as it was not a matter of crucial importance, Mongul did not bother with it for too long. He was happy enough to have succeeded in 'convincing' him to fight. He did not care about his identity as long as he kept providing a spectacular performance as a gladiator because that prisoner had been the toughest nut to crack ever. At some point, it had looked as though even the Black Mercy had started to lose its effectivity. It was when Mongul was contemplating to just order his death, deeming him to be a lost cause, that the prisoner unexpectedly caved in, finally submitting.

That said, while they did not know his identity, any gladiator fighting in the arena had to have a name. Due to the prisoner having been discovered in the unknown void and due to his freakish, fiend-like healing ability Mongul decided on calling him a 'voidfiend'. And that was the name that the prisoner had became famous on Warworld as.

"That terrible Voidfiend against an adult Kryptonian. This fight will definitely be a blast. I will ask for a few weeks leave from work myself. I'm not missing this out for anything! What do you say, boys?" the commander said and his subordinates cheered in and shouted in agreement.

Ever since Mongul had taken over Warworld, gladiator fights had become the worldwide number one entertainment for the inhabitants on the planet. The ship commander and his crew were no different. Having the opportunity to watch two enslaved god-like creatures fight in a life-and-death battle was bound to excite them like nothing else.