Aight, I was originally tryna write this after all my other works were finished but talking to a friend rekindled my love for Green Lantern, so I've gotta hurry up and do this before it cools down again. I highly advise reading the two Star Trek/Green Lantern crossover series before you dive into this.

The first few chapters are basically there for me to vent, the real Khandemption arc will start once all the venting is finished.

This story is heavily inspired by Doom Eternal and both Lego Movies. It's set one year after Star Trek Beyond, and shortly after the Nekron incident. I will be referring to Carol Marcus as "Carol" and Carol Ferris as "Ferris" to avoid confusion.

Chapter One!

How did I feel?

In that moment, when I lost the love of my life?

When I ran, helpless, one very angry Vulcan hot on my tail?

I felt...nothing.

Like the sky and the ground broke apart and all that was left was a void as big as everything.

And that void was inside me.

I didn't feel anything.

Anything...but rage.

Rage

Rage

Rage

...

"Fascinating." said one Khan Noonien Singh, staring at the Red Lantern ring in his hand. He and his beloved crew had recently been woken up, and here they were, face-to-face with strange things. "This fallen monster used his ring as a weapon..." he murmured, referring to the defeated Atrocitus. "And here you are, wielding rings of your own, albeit of a different shade. Tell me, have I once again been awakened centuries in the future? One in which battles are waged with...jewelry?"

"You said your name is Khan?" asked John Stewart, a Green Lantern from a dead universe. "Tell us what happened here."

Khan pointed down at the defeated Atrocitus, and declared "This monster made a big mistake by demanding our obedience after he freed us from our sleep. His power was impressive, but it was no match for the combined might of 73 Augments...AHKKK!" Suddenly, Khan collapsed to the floor, clutching his head. He paid no attention to his surroundings—already he was being spoon-fed way too much information. And at the end of it all, there lay a scripture of light.

Who are you? asked Inner Khan, still trying to wrap his head around everything that had come crashing down over him. And the scripture unfolded to reveal those words:

I'm innocent rage.

I'm innocent hatred.

I'm innocent sword.

Take me up, and you will be fulfilled.

Inner Khan knew that this was just what he needed in order to carry out vengeance for his Vengeance, and reached out to take the scripture.

And that was when the Universe's fate was sealed. Khan now had the ring on his finger, and asked the Green Lanterns "Mayhaps...you can teach me how to wield this?"

"Hand that thing over to us, pal—!" yelled Guy Gardner, another Green Lantern but John stopped him.

"What were you doing down here, stranger?" asked John. "And why were you and your friends "asleep"?"

"So you're not Starfleet, then. We were locked down here for others' safety, not our own. And we're never returning to rest." Khan replied.

"I don't think I like this guy, Johnny." said Guy.

"We're not Starfleet, but we are their friends. If they put you here, there's no way in hell we're just gonna let y'all swagger right past." declared John. "Gimme that ring."

"Besides, that ring's useless to you anyway, pal. As long as Atrocitus is still alive." Guy added.

"Oh, for reals?" Khan scoffed before crushing the fallen Red Lantern's skull with his foot, and instantly, the ring jumped to life. To Khan, it felt like doing something wild, such as listening to Meat Loaf albums from the 70's and 80's when he was alone with nothing to do. He wanted to find a way to make more and make sure that all of his crew had one, but that'll have to wait. Right now, all that mattered was bloodshed.

"Still want me to go easy on him, Johnny?!" yelled Guy.

"We need to concentrate our power...and take him out!" cried John, and a green energy blast from both him and Guy's rings knocked Khan out.

Meanwhile, Kilowog, another Green Lantern, was dealing with Khan's crew. "Hey! Get offa me, ya poozers!" yelled the large alien.

"He called 'em "Augments".". said John. "But...augmented with what?"

Suddenly, red tendrils slid around the greens' necks, choking them. "Augmented with the science of a forgotten time." said an imposing male voice. "And now made even stronger by the rage that courses through this ring...and me." Khan threw the greens into a wall, and declared "And now...any who oppose me...will suffer your fate."

"My liege, what happened?" asked Malik, one of Khan's loyal soldiers, obviously shocked by his king wearing alien attire.

"This happened." replied Khan, showing off his ring. "But fear not. I am still the same man you called leader...and friend."

Taking over a Starfleet ship was easy as pie, considering what I became capable of.

It were times like those I wish there was a solid surface I could land on, so I'd use the blood of the slaughtered crew to form a lake.

At least, that was what the ring's records told me. I thought this ring would fill the void within...I was wrong.

I had the most powerful weapon in the whole entire universe on my finger.

But I would have given it up to have my Vengeance.

I would have traded everything so I didn't feel so helpless. So...alone.

"Are you sure we can trust it?" asked James T. Kirk, captain of the USS Enterprise. He was currently helping out the survivors of the dead universe mentioned earlier, and said survivors had found something they never expected to see in this new universe—an Oan manhunter.

"It's kept its word so far, hasn't it?" asked one Hal Jordan, formerly one of the greatest Green Lanterns. "Like I said before, they ain't mindless killing machines yet."

"That's...not reassuring." replied Kirk.

Meanwhile, Montgomery Scott, the Enterprise's chief engineer, was examining the manhunter. "Amazing! There's technology in here we haven't even imagined!"

The Guardians are the most advanced species in the whole entire universe, said the manhunter, explain how you are in possession of their technology.

"I arrived here from another reality." said Hal. "One in which the Green Lantern Corps replaced the manhunters as the peacekeepers of the universe."

The manhunter looked surprised. It said You claim that the manhunters betrayed the Guardians...Impossible!

"I have the scars to prove it." replied Hal. "What matters right now is that we're still on the same side, and I need your help. There's a ring-bearer named Sinestro who arrived in this reality with me, and he'd love nothing more than to reach Oa and steal the Guardians' power before they can create the Green Lantern Corps. I'm betting he's already on his way there."

The manhunters will intercept and destroy him first, said the manhunter.

"What? No!" cried Hal, worry evident in his face. In spite of everything that had happened both in the dead universe and this one, he still loved Sinestro and it was obvious to the Enterprisers by now and now that Ferris had chosen Scotty, there was now nothing but that simple wall that divided good and evil between them. "I mean, you've never faced anything like Sinestro before. You'll need our—"

Captain! Urgent distress call from the USS Bryant! cried a voice from the comms.

"That's the ship the other Lanterns were on...!" said Kirk.

"If they ran into Atrocitus..." Hal began.

"We're on our way." Kirk finished. "And we're welcome for any help you manhunters can provide."

LATER...

"No response to hails, captain." said one Nyota Uhura. "Some kinda distortion is affecting our scans of the interior, but it appears that the life support aboard the Bryant has been compromised."

"Captain, if we are to investigate directly..." said her boyfriend Spock, the half-Vulcan first officer of the Enterprise. "I would advise caution."

And so Kirk, Spock, Hal and some others went to the Bryant to see what the heck was going on. "You don't need to breathe when you're wearing dat ring?" Kirk asked Hal.

"Just don't ask me how it works." said Hal.

"Captain!" Spock called out, "Look over here! The Bryant crew...they're all dead."

"Why would Atrocitus attack a random Starfleet ship?" Hal asked himself.

Kirk began snapping out orders. "Kirk to Enterprise—Sulu, beam two more security teams over to our posiition. And break out the phaser rifles."

"My ring's picking up a ring nearby!" Hal said. "And a red one at that!"

Suddenly, a rich, booming male voice said from a corner:"Thank you for responding to my distress call."

"Khan!" said Kirk upon encountering the owner of the voice.

"Khan?" asked Hal. "Who the hell is Khan?"

"Hello, Kirk, Spock and whatsisname." said Khan, and Hal seemed to be a bit ticked off by being called "whatsisname". "It seems like only yesterday that we met. Well, that's what happens, I suppose, when you're left frozed for who knows how long. I'm so glad I awoke before we missed the chance to meet again. Now...shall we continue?"

"Wait a minute..." Kirk said, but Khan ignored him and kept on talking.

"The last time I saw you, we were standing in the middle of an antiseptic Federation courtroom as my fate was decided by a buncha insipid bureaucrats...while parts of San Francisco still burned from my attack on your oh-so-precious utopia. You, whatsisname, with the green ring, I don't know you...but I see that we already have something in common. You must be possessed of considerable power, as I now am. Why ally yourself with the weak?"

"So you're Khan..." said Hal. "You're right. I don't know you...but I'm pretty sure I know your type." He then fired a green energy beam at the Red Lantern.

"Target Khan first!" ordered Kirk. "Phasers on kill!" Immediately, everyone began firing, but Khan just fended the phaser shots off as if they were nothing, only to have himself caught in a green construct.

"I'm guessing you got that ring from Atrocitus, which can mean only one thing:you killed him." said Hal. "Pretty impressive, but you don't have a clue what kinda power you're wielding right now! And you don't have a shred of my experience!"

"You pitiful fool..." Khan mumbled. "You speak of "power"?"

I didn't feel fear, or doubt.

I just felt the void inside me.

And I had to let it out.

"I...am...power!" Khan yelled, and with that, he released a huge burst of red light which sent Hal flying. A tiny crack was visible on the ring but nobody seemed to notice it except for Inner Khan. "Kirk. I should have killed you when I had the chance. I'm not making the same mistake again. Today, you all die." Khan declared, then turned to Spock and added "You took everything from me."

"What are you talking about?" asked Spock. Khan grabbed him with a construct and forced the Vulcan to meld with him. And what Spock saw was so illogical yet at the same time full of sorrow and anguish, by the time it was over, he was all like "my god, what have I done?". He had just relived the moment where he set off those torpedoes and crippled the USS Vengeance...crippled Khan's one true love.

"N...no!" Spock tried desperately to justify himself. "It was only logical to do that!"

"And you didn't care a bit about how I felt." Khan growled. "You took my Vengeance from me...and did nothing to get him back!"

"I get it, you loved the ship, but how can I do that? That's just illogical!" yelled Spock.

"And taking my blood to revive your precious captain was not?!" Khan retaliated, then formed a giant construct blade from his ring.

Kirk, realizing that Khan was about to execute Spock, suddenly got on his knees and began pleading with the Augment. "Please!" he cried. "Not Spock! I'll do anything, literally anything! I see it, you have a Vengeance-sized hole in your life which is a bloody big one considering what the hell of a ship it was, I'll do everything in my power to mend that hole! But please...not him..."

And seeing it all from a corner, Hal realized. The feelings Kirk had for Spock were not unlike the ones Hal himself had for Sinestro. It was love. What else could it be?

Even if his ring was running out of charges, he knew he had to act—fast. Ring, don't fail me now! he thought as he struggled to get up.

Ashes-Celine Dion

What's left to say?

These prayers ain't working anymore,

Every word shot down in flames,

What's left to do,

With these broken pieces on the floor?

I'm losing my voice,

Calling on you...

'Cause I've been shaking,

I've been bending backwards till I'm broke,

Watching all these dreams go up in smoke..

Let beauty come out of ashes,

Let beauty come out of ashes,

And when I pray to God all I ask is,

Can beauty come out of ashes?

Can you use these tears to put out the fires in my soul?

'Cause I need you here, woah,

'Cause I've been shaking,

I've been bending backwards till I'm broke,

Watching all these dreams go up in smoke,

Let beauty come out of ashes,

Let beauty come out of ashes,

And when I pray to God all I ask is,

Can beauty come out of ashes?

Can beauty come out of ashes?