A/N: It's only the second story and I'm already doing a multi-crossover story. So, time we have Gravity Falls crossover with Rick and Morty, Star vs the Forces of Evil, Transformers and Steven Universe, with a few hints of others shows here and there. As always none of these characters belong to me and I hold you'll all enjoy the story.

The Last Meeting of The Illuminati

The Past…

Ford had been sitting on this rock out in the middle of the forest for nearly an hour now. Had it not been for the fact that he had been called out here by someone he trusted he wouldn't bothered with standing out here in the first place. The scientist checked his watch for now the fourth time now and watched as the two arms on his watch turned reached twelve, indicating that it was now midnight. Ford let out an impatience sigh, he waited to be kept waiting like this, especially when he had some much work of his own to deal with. But urgency in his friend's words seemed quite real and considering that this particular friend was usually apathetic toward just everything, it must have meant that the situation was truly dire.

Friend, now there was a word that was truly alien to Ford. Sure, he had Fiddleford, and his team, but even as a boy Ford never really had time to socialize with people. Aside from his brother Stanly, the paranormal investigator never really had time to make friends with other people. He always carried himself with this aura of pride and high intellect that often off put other people, which was fine by Ford, the less people around him the better. Gravity Falls and the rest of the paranormal activity that was scattered throughout the dark corners of the world made it to dangerous for those who had no clue as to how to properly handle themselves when faced such horrors or how to carry out what needed to be done at times. Perhaps that's why he liked working with this group, they knew how to protect themselves and knew when to make the impossible choices.

The paranormal researcher could still remember the day they all met. Five years ago, Ford was in Manhattan after Fiddleford tipped him off that he had been picking up mysterious energy signatures coming from the city. Ford set out to investigate these strange energy readings and soon discovered that he was not the only one following the trail. Four other likeminded beings were also on the hunt for whatever was happening in New York and were determined to get to the bottom of it. However, unlike Ford, the other four individuals were vastly different from him in that weren't human.

The first one he came across was a scientist named Rick Sanchez, although scientist was probably being kind considering that Rick was really a madman with a serious death wish. At first, Ford assumed that Rick was human like him, but while he was human at one point in his life, that was no longer the case. Apparently, Rick had the means to traverse the multiverse, and in his travels, he joined a rebel cell that battled a tyrannical intergalactic government. As one would imagine, a mere mortal man could not keep fighting for as long as he has without receiving some serious injuries during said war. So, he was given cybernetic upgrades that allowed the now elderly man to keep fighting. Not only that, but Rick was incredibly intelligent, able to think of solutions no one could have ever dreamed of. However, the reasoning for Rick being here wasn't exactly for scientific reasons: he was bored and wanted to kill some time.

Following that was Rose Quartz, the leader of wayward aliens who called themselves the Crystal Gems. Apparently, Rose lead a rebellion against her own people centuries ago when they attempted to turn the plant into a colony to produce new servants for their masters, the Diamonds. Ford had some experiences with the Gems, or better put, had experiences with the aftermath of their war. In his travels, he had come across the battle scars of the Gems civil war on earth, but never in his wildest dreams did he think that he would actually meet one of these off-world beings—let alone the leader if the rebellion that saved humanity form being wiped out by tyranny of the Diamonds. Rose had apparently been following these energy readings in secret from the rest of her team, fearing that may be the work of Homeworld trying to once again take the earth for their own.

The next was another being from another world, only the world that this person hailed from another dimension entirely. Her name was Moon Butterfly, and she was the queen of a wayward world called Mewni. Moon was a master of her world's mystic arts and wielded a magical wand that was not only an object of great power but was also the symbol of her people's mastery over the forces of evil. Moon had traveled to earth in search of several missing subjects that had vanished. She had used a spell to locate them and followed it here, where she only discovered the bodies of those she had intended to save. Now she was concerned with avenging her slain people by bringing down whoever or whatever had taken them in the first place.

Finally, there was Optimus Prime, the leader of a faction of sentient, alien machines known as the Autobots. Much like with Rose, Ford had been investigating the Autobots as well, though it was much easier to do considering that the war the Autobots waged with their long-standing enemies, the Decepticons, was out in the open for all to see since they worked alongside the UN when it came to matters of dealing with Megatron and his followers. Admittedly, Ford couldn't help but feel a little giddy inside with meeting the leader of the Autobots face to face. Optimus's reasoning for coming to New York alone was because he suspected that Megatron was working on a new form of weaponry to use on Prime's soldiers and did not want his men to be caught in the line of fire should that be true.

However, the source of the mysterious energy readings wasn't the work of the Decepticons or Homeworld, but by another cosmic race of beings entirely. As it turned out, the ones behind it were a race of brain-like beings known as the Krang. A race of savage yet intelligent creatures that hailed from a realm called Dimension X that wanted to mutate the planet and its inhabitants for their own nefarious purposes. Apparently, the energy readings the five travelers had picked up came from the Krang's latest weapon to terraform the planet to their liking: a massive cannon that would dispute the earth's atmosphere and rain mutagen down upon the planet. Knowing that this scheme could not come to pass, the five individuals united, and together, they destroyed the weapon and chased the Krang off world and back to their home dimension. However, it wouldn't be the last time Ford and his new allies would face the Krang in battle.

After fouling the Krang's scheme, Ford suggested to the rest of the group that perhaps they should stay in touch in case another event such as this would arise. At first, the others were reluctant to join forces with others whom they had just only now met, but after some convincing from Ford, they agreed to stay together. However, they decided that if they were to remain a team, they would have to remain a secret, knowing that their respective friends and family wouldn't understand the lengths they would have to sometimes go to in order to safeguard the world from those who would wish to do it harm.

And so, whenever a crisis arose that was too great for one of them to tackle alone, the five heroes banded together and protected the earth from the shadows. They kept their work clandestine, so they would not be interfered with by the likes of the Global Justice Network or N-Tech. The team faced forces that would drive a normal man into the deepest depths of insanity. From stopping an intergalactic warlord known as Lord Dominator from destroying the planet for the sheer joy of it, to keeping an immortal gargoyle named Demona from taking the Spear of Destiny, the group had saved the world time and again from forces that they had no idea even existed. In time, the five of them found themselves enjoying the company of one another, and as a team, they were unstoppable.

The Illuminati, that's what they called themselves.

But tonight, something felt different. Ford could almost sense that whatever they were meeting to combat with would truly test them to their very limits. The paranormal researcher then heard the familiar sound of one of Rick's portals opening up beside him. he turned to his left to see that a green portal had opened up, thus allowing Rick to step through it and into the forest. Ford also noticed that the fellow scientist was carrying a strange, metal device in his arms. It was square shaped with a radar dish on the top of it while also having a control panel of the side of it.

"Hey Ford. Hope I didn't keep you waiting too long" Rick regarded in his usual apathic manner "had to do some last-minute adjustments to this baby"

Ford stood up to shake hands with the fellow scientist. Out of everyone on the team, the paranormal investigator enjoyed spending time with Rick the most. the two would spend hours discussing the mysteries of the universe, which compared to Rick's current knowledge of it, made Ford feel a bit inadequate. But regardless, the two enjoyed one another's company all the same.

"It's good to see you, Rick" Ford greeted with a handshake before he gestured to fellow scientist's device "I assume that's why you wanted us all to meet?"

"Well, it's part of the reason" Rick replied "I'll explain when everyone else gets here"

Almost as if on cue, two portals opened on either side of the two men. The first to step out was Rose, who was riding on the back of her trusted pink lion as always. The second to come out of her own portal was Moon, who examined her surroundings before fully stepping out.

"Ladies" Rick regarded off-handedly

"It's good to see you all again" Rose replied with a smile

While the leader of the Crystal Gems was happy to meet with the others, Moon merely nodded her head to them in acknowledgement. Unlike everyone else, the ruler of Mewni was distant from the others, mostly because she viewed them all as just allies rather than something more. This of course made her seem cold toward the rest of the team, which in Rick's case he could care less about since he had no love for the Mewman either, mostly because she was a symbol of authority, something the galactic outlaw despised. Just then, the members of the secret group heard the roar of a semi-truck's engines and sure enough, there was Optimus driving up to meet with them. once he was close enough, the autoboot transformed into his robot form and walked the rest of the way to meet with them.

"It is good to see you all once more" the Prime began "But I am curious: why did you call this meeting, Rick?"

Everyone turned their attention back to Rick. Ever since he had summoned the Illuminati to meet once again, he had been vague as to why. All the other members knew was that it was of the utmost urgency and that they couldn't waste a single moment. But as all eyes fell upon the genius, a brief look of guilt came over his face for only a second before he washed it away with a swig of his flash. He then reached into his pocket and pulled out a small circular device that, when activated, created a small holographic image of the universe that fit in the palm of his hand.

"Alright, so here's the deal" he began causally "What your seeing is our universe, nice right? But here's the problem…"

The images turned into two images of the earth that sat side by side one another.

"Every now and again the multiverse goes full retarded for a few seconds and accidentally causes one earth—you know, that thing that's vocal point for every universe within the multiverse—to occupy the same space as another earth, creating an incursion point in the process"

"An incursion point?" Rose repeated as a question

"It's when two earths start to fight over space within reality in order to continue to exist" Rick explained "It's like when two male porn stars' dicks are trying to occupy the most space in a vagina, but only one dick can stay in"

Despite Rick's usual crass analogy, the other Illuminati members understood what he had meant by that, as well as fully understanding the severity of the situation that they were now in.

"So, another earth has entered our universe?" Optimus gathered before asking "if that is true then why can't we see it now?"

"Because it's on entirely different dimensional frequency than ours" the genius replied "But it won't be long until that earth's frequency will try to adjust to our own, and that's when shits really gonna hit the fan"

"How much time do we have?" Ford questioned, trying his best to remain calm

"My best guess: less than forty-eight hours" his friend answered

"Tell me you've thought of something" Moon said in an anxious voice

"Oh, trust me, I built this baby months ago for just such an occasion" Rick assured, patting the machine he had brought with him "This'll solve all our problems in a heartbeat"

"But?" Ford added on, sensing that there was more than he was letting on

Rick didn't answer right away. Instead, he took out his flask and took a long drink from it, obviously wanting to be buzzed before getting into a deep discussion as he normally did.

"This thing will save our earth" he began "by destroying the invading earth"

The whole world seemed to stop when the rest of the Illuminati heard those words spoken. True, they had crossed a line every now and again, in order to safeguard the earth, but it was against threats that needed to be dealt with in harsh manner. The thought of wiping out billions of lives for a mistake the cosmos made was too much for them to take in all at once mentally.

"There has to be another way" Optimus said

"There isn't" Rick adamantly denied "I'm not the only Rick whose seen this before. Every time an incursion happens, one earth is destroyed—sometimes both are due to the struggle. The point is that at least this way we can save our earth from being destroyed"

"I can't accept that" Optimus denied "And I can't believe you are, Rick"

"Perhaps he's right" Moon spoke up

Everyone turned their attention toward the queen of Mewni. In their past adventures, Moon always dealt in absolutes, whether it be ended the threat of some cosmic madman or annihilating some being from beyond the realm of reality, but none of her teammates could even think that she'd be willing to commit genocide on a planetary scale. Then again, it shouldn't have surprised the group either. They knew that Moon was willing to do anything to safeguard her kingdom and would cross any line to do so. When she was a teenage and forced to take the throne after her mother was murdered by a monster named Toffee, she made a deal with Eclipsa, the Queen of Darkness, to cast a spell to rob the monster of his immortality.

"You can't be serious, Moon" Rose demanded "There are billions of innocent humans on that other earth, if we could just reach out to them—"

"There is no time for that!" Moon snapped back harshly "you heard Rick: we have less than forty-hours to save our earth from being destroyed!"

"Why would you even care? You don't even live on earth!" Rose retorted in a sharp tone

"Because if the earth dies, then everything else it's connected to in the multiverse dies with it—including Mewni!" the queen shot back "and if that means sacrificing another earth to do so, then I won't hesitate!"

"But we just can't destroy a world that wishes us no malice just for a mistake the cosmos made" the Gem tried to reason

"I don't know why your so against this, Rosie" Rick commented offhandedly "I mean, didn't you kill Pink Diamond to protect the earth? I figured you'd be all for this"

Rose visible flinched upon hearing that. Unlike Moon, who told the others of her past, Rose kept her assassination of Pink Diamond vague, leading both Rick and Ford to believe that there was more to the slaying of the supposed tyrant than she was letting on.

"That was different…" Rose finally said in a sullen voice "Pink Diamond left me with no other choice, and you all know how the rest of the war went"

Rose clenched her fists and steeled her gaze upon the others before speaking again.

"I will not be a part of this madness" she declared adamantly "and even if that means I have to fight all of you to in order to keep you from going through with this—then so be it!"

"I am with Rose" Optimus agreed "If you choose to use that machine Rick, then so help me I will fight you with every ounce of my strength!"

The battle lines were being drawn right in front of Ford. He noticed Moon clutching her wand tightly just as Rose began to reach for her sword as lion let a low threating growl, ready to fight alongside his master. It was utter madness, in just a few minutes the paranormal investigator was watching what could very well be the end of the Illuminati right before his very eyes.

"Well Ford?" Rick asked "it look like you're the tie-breaker here. So, yay or nay?"

Everyone turned their attention toward the only human among them. Perhaps out of everyone else, his word on the matter was by far the most important. Throughout the conversation, Ford had been weighing the options of how best to handle this situation. he never thought once in his life that he'd be faced with such a terrible choice to make. He knew that his earth faced a dire peril that he and the others simply couldn't think a way to save both earths, but on the other hand, could really condemn an entire earth to die? Who was he to make such a decision? True, he had made some tough calls in the past with the rest of the Illuminati, but could cross this threshold and damn another earth to oblivion? However, if he didn't, then the people of this earth would be as equally as doomed as the invading earth.

As Ford contemplated his choice, he noticed Rick slowly reaching for the controls on his machine. He wasn't the only one in the group that took notice of his actions as Rose also saw what the scientist was trying to do. In a flash, Rose drew her blade, summoned her shield and lunged at Rick. However, Moon quickly raised her wand and fired a blast of magical energy at the leader of the Crystal Gems, sending her flying back several feet. As Moon flew after Rose to continue the fight, Rick began to furiously type on his device's control panel, only for Optimus to raise his rifle and take aim at him. ford could mentally register what was going on as he found himself tackling Rick out of the way as Prime fired off a shot from his weapon that was meant to kill his friend.

"Everyone wait there's no need to—ugh!" Ford attempted to reason before being knocked to the ground

While Ford was trying to calm everyone down, Rose's lion had tackled him to the ground, pinning him under his massive paws as he did. Ford held the pink beast's jaws back as the magical cat tried to sink its fangs into his skull. Rick activated his cybernetic arm cannon and fired it at lion, stunning it long enough for Ford to get out from under the creature and draw his magnet gun. The lion shook off the hit and turned its anger on the scientist that had done harm to it. Before Ford could take aim at lion, he was forced to leap out of the way of Prime's massive foot as it came it down on him.

"Optimus, this is insane!" the paranormal researcher exclaimed "we can't fight amongst ourselves while the earth hangs in the balance!"

"Exactly" Prime replied as he took aim with his rifle "And I will find a way to save both earths!"

In self-defense, Ford took aim with magnet gun, hoping he had enough juice to at least stun his friend. However, the sudden sound of a nearby explosion rocked the area. The group turned to see that Rose and Moon's battle was still raging on. It was all coming apart in front of Ford. Everything that he and the rest of the team had strove for all seemed to be going up in ashes, and it was all by their own hands. It was then that he saw a sorrowful look in Prime's optics as he watched the two warrior women to continue to fight one another. The leader of the Autobots then glanced back at Ford, his look alone told his human friend that he too was heartbroken by this sudden turn of events.

Suddenly, a flash of green light flashed behind them, making even Rose and Moon stop their fight. Standing over the unconscious form of lion was Rick, holding his machine into the air as a green light of energy flew upward into the sky above them. Once it reached the atmosphere, it struck the surface of the other earth, allowing the members of the Illuminati to see a brief glimpse of the other earth before it vanished, making them all feel a wave of guilt wash over them. For all their talk of being heroes, they had just committed the single biggest act of mass genocide this world had ever known. They could almost hear the dying screams of the billions crying out as their world burned. Overtaken by grief, Rose collapsed to the ground as tears flowed freely from her face while Moon stood in horrified awe by what she had just witnessed, and Optimus and Ford could only look down in shame.

Rick, however, seemed unfazed by his act of planetary mass murder as he once again took out his flask and took another long swig from it. He let out a burp as he put his alcohol container away to face the collective rage-filled faces of his comrades.

"Oh, don't give me that look" he protested "I just did you jack-offs a favor!"

"By killing billions?!" Rose demanded "Is that the kind of favor you gave us?!"

"I kept your conscious clear" the genius retorted "I knew you assholes wouldn't have the balls to go through with this little crisis, or if you did you'd would be all mopey about it later. So, I went ahead and did you guy's a solid and saved you from losing whatever moral high ground you claim you stand upon by going ahead going through what you all couldn't bring yourselves to do"

"You bastard!" Moon snarled "You could've done this all by yourself without even telling us, couldn't you?!"

"Sweetheart I've done this six times already" Rick corrected "This time I wanted to see if any of you were really willing to cross those so-called lines you have"

Everyone was stunned by Rick's revelation. All this time he had been destroying earths without telling them and the one time he did he treated it all like some game. Ford above everyone else felt the most betrayed. For the longest time, he always assumed that Rick was someone he could always count on. Sure, he could be crass and at times volatile, but despite that Ford always felt that deep down he had good heart. But in the end, it was all a lie.

"So, this was all some sick test?" Prime surmised in an angered voice

"More or less, tin-man" Rick answered causally "I thought you'd be a cool group to hang with, but your all just a bunch of pussies"

"Rick…" Ford gritted from his teeth

Rick turned to face his friend but was instead greeted by a fist that struck him across his jaw, knocking him to the ground as he did. Just as he aimed his magnet gun, he was faced with Rick holding his laser up at him, charged and ready to fire. Optimus, Rose and Moon all readied their weapons for another fight, but deep down they knew that a fight with Rick would be suicide. They knew that the mad genius could easily kill all four of them without much effort on his end, but the sting of their betrayal was too great for them to ignore. Rick looked at his surroundings before slowly lowering his weapon and getting back on his feet.

Without a word, Rick took out his portal gun and departed from the scene. Silence stood over the rest of the team as they all looked at one another with mistrust and sadness in their eyes. They knew they couldn't come back from this, not after what they had just went through. Following rick's example, Moon took out her scissors and cut a hole back to her world while Rose awoke lion, so they could return to their home in Beach City. Optimus turned away, transformed by into his vehicle form, and drove off into the darkness of the forest.

As for Ford, he silently sat back on the rock he was sitting on and merely looked up at the stars, hoping that the cosmos would forgive him.

"Jesus…" Stan breathed out as he took everything he had just heard his brother tell him

It had been three days since Tala's attack, and since then Ford had a lot on his mind. The fact that this new enemy came from another earth made him think of that night, making the guilt of that night return. Over the years, Ford had done his best to try and move past the last meeting of the Illuminati, but the best he could do was bury his shame underneath his work. Tala may not have hailed from the world Rick had destroyed, but she did dredge up his feelings toward that night. At first, he considered simply ignoring it and tried to move on, but the pain was too great for his mind he found himself needing to talk to someone, fortunately, he knew the one person who he could talk to without being judged—sort of: his brother. And so here they were, standing in Stan's room in the Mcguket manor as Ford told him of that dreadful night.

"I'm not proud of how that night turned out, Stanly" Ford admitted "But I still wish I could fix everything between the five of us"

"And you can't because?" his brother asked

"well for starters, Rick and his family moved to another universe. The last I heard, Moon has gone missing and her daughter rules Mewni now, and Rose is…" Ford trailed off, hanging his head in shame "Rose is gone…"

"What about Optimus?" Stan further questioned

"I…haven't spoken to him" his twin answered "I wouldn't know what I'd say to him if I could"

"Meh, you'll think of something" the con-artist assured him "I mean, it wasn't like you were going to vote on destroying that other earth, right?"

Ford looked at his brother with a sullen expression, one that told Stan all that he needed to know.

"Oh" Stan said, clearly taken aback "Uh, yeah, probably best if you didn't go talk to him then"

"It's not just that, Stanly" his sibling continued "Dipper and Mabel think I'm some great hero. If they knew about this, they'd—"

"Forgive you" Stan interrupted "Those kids would still think your great. I mean hell, I lied to them for half of last summer and I still got sympathy from them!"

Ford couldn't help but smile at that. In the time that the two estranged brothers had been reunited, they had become closer. Granted they still butted heads every now and again, but it was typical among siblings.

"Uh, are we gonna hug or something? Because I ain't good with this touchy-feely crap" Ford's twin said

"No, but I would like to keep this away from the others…for now at least" Ford answered "I'll tell the kids when I feel ready"

"Whatever you say, bro" Stan agreed as he patted his brother's shoulder "just know I'll be at the bar when you do"