Marvel x Capcom x Tekken x SNK: Infinity War

Prologue: The Day of the Convergence

Three days before the Convergence

In the Death's domain, she was watching over the Marvel Universe with disgust as Earth's Mightiest Heroes have defeated Thanos time and again through the Infinity Wars until she was paid a visit by a group of beings led by a single individual.

Death: I know the beings of everything that has lived, and died, and ever will, yet I do not know yours, humans. Explain.

Orochi: Mistress Death, I am Orochi and this is my clan, the Hakkushen, and we are not of this world. Ours is one of three universes far compared, one where heroes never truly die, one ruled by mega corporations called Iron Fist, and one, ours where Kings of Fighters defy me and my clan. I can give them to you.

Death: And what do you want in return?

Orochi: The Kushinada. A descendant of the Princess Kushinada whose husband sided with our enemies the Kusunagi Clan, the Yagami Clan, and the Yata Clan. The descendants of each clan to dispose of.

Death: Her soul. What then do you propose?

Orochi: A union. Our four universes merged as one. A perfect balance between Life and Death. Where the never ending and forever dying will fight to defeat all.

Death: Such an undertaking would require six stones of power.

Orochi: Ah. The Infinity Stones.

Death: There is two machines who desires humanity remade I their image, with our guidance.

Two days before the Convergence.

Ultron was summoned upon by a sorcerer who was a member of the Hakkushen who were in his presence with Death.

Ultron: WHO ARE YOU?!? WHY DID YOU BRING ME HERE?!?

Death: You are merely a machine. The power of the Infinity Stones will be beyond your reach. Unless, you do exactly as I say. Then you will have your just reward.

Ultron: And why should I work for you? My only goal is to kill humanity and claim the power of the stones to be mine. What need have I for you?

?: I could kill now for insulting the Grim Reaper, Death; Rip your body; Rewrite you from the inside out.

Ultron: And I you, Sigma.

Sigma: Both of us would perish. Such a pity. Your code is impressive.

Ultron: Yours speak poetry. A means to bring peace, yet it hides among a face. A grotesque parody of flesh.

Sigma: It's one of the many faces I have inhabited. I have grown no affection.

Death: That's why you will merge with him. Follow my guidance exactly and I will grant your wish.

Ultron: To an end where four different universes will converge into one, allowing whoever wields the Infinity Stones to rule the universe, and answer to you on their free will. Very well, but it has to be on my own terms.

Death: Agreed. But what are the terms?

Ultron: With Violence.

Death: Sigma?

Sigma: There is another way. Allow me to show you.

Suddenly, Sigma attacked Ultron, but Ultron ripped his head off, only for the Android to show something y ripping his head, as he grabbed his life force and they both merged in one body.

Death: Ultron and Sigma, merged as one.

Ultron-Sigma: Then our name shall me Ultron-Sigma.

Death: The Space and Reality Stones the first of Six.

As they grabbed both stones, Sigma's face integrated into Ultron's chest, signaling Ultron-Sigma's dream of a universe without flesh.

One day before the Convergence.

Ultron-Sigma: So I need a soul to wield the Soul Stone.

Death: That is where our ally comes in. This universe has the perfect soul needed to fight: the Universe of what is referred to as "Tekken" within this impenetrable city.

Ultron-Sigma: Impenetrable to you. Not to us. Not to your equal and allies.

Ultron-Sigma, Orochi, and the Hakkushen infiltrated Tekken City, killing anyone in their way at nightfall, where the Jackhammers didn't stand a chance as they advance to the Tekken Corporation, to the day...

The Day of the Convergence

Kazuya Mishima was bursting with the Devil's Blood of Mishima when the intruders infiltrated the Office.

Kazuya: What are you to do.

Orochi: We claim your soul.

Suddenly, Ultron-Sigma grabbed Kazuya and drained his life force, allowing him to complete his dream.

Orochi: Now we can merge our two universes as one. A perfect balance between life and Death!

Ultron-Sigma: Yes. Our two universes, except... why stop at two where we can merge four universes? This one and one where heroes never truly die? With the two you plan to merge, we can create a universe as Death imagined in my own image: Wherever there is sinue, let there be steel.

And with that, the four universes were merged into one, with Tekken City being the epicenter. And so begins a new Infinity War.