(The forces of Light manage to arrive at Kronika's hourglass. But...)

Kronika: You are a little too late!

(She turns back to the hourglass and pours her energy into it. All of the heroes are seen affected by the rewind. Only Izuku, Katsuki, All Might and Izumi are unaffected. Kronika realizes that Izuku is shielded by the power of the spectre.)

Kronika: Scorpion's gift shields you from the power of the hourglass. Regardless, your allies are gone, while mine remain to defend me.

(She motions to All Might, Katsuki and Izumi.)

Kronika: Finish him!

(Izumi and Katsuki charge Izuku at the same time. He parries Izumi's punch with his hands and ducks under a swipe, but walks into a powerful punch from All Might. As Izuku staggers back, he manages to block an ax kick from Katsuki, but takes a sidekick to the stomach from him when he counterattacks. All Might immediately strikes him in the face with another punch, then Izumk hits him in the knee with her kick and twirls around to smash his chest.)

(Izuku remains on his feet as the former heroes come in again. He
catches Katsuki's hand before he can swipe him with his quirk and blocks Izumk's attack with his other arm, but this leaves him open to All Might, who blasts him with a barrage of fists to
his sternum. With Izuku stunnned, All Might steps back and delivers a sidekick to the sternum that knocks Izuku backward, sending him crashing hard to the ground.)

(For a moment, Izukj writhes on the floor, but struggles to his feet. The enemies remain in fighting stances. Izuku closes his eyes to focus... and hears the voice of Scorpion.)

Scorpion: The Shirai Ryu's pride flows within you. Let it fuel your fire.

(He opens his eyes again, and now they sparkle with fire. His face etched with fierce determination, Izuku looks to the heavens and roars with fury. Lightning strikes his body and
fire explodes out of it once more. He shifts into a fighting stance, dispelling the fire and electricity as the three villains charge him again.)

(All Might attacks first with a barrage of punches, but Izuku parries them all, as well as some strikes from Izumi. He then blocks a high kick from Bakugo and another from All Might,
dodging between strikes from Kitana's fans. He grabs Katsuki's hand as he tries to blow him away, then steps forward and judo throws him to the floor. Before he can recover he punches him in the face, knocking him unconscious.)

(Izuku then throws a roundhouse kick that counters a power strike from All Might,  blocks some more punches and lands a straight punch to Toshinori's face, sending him reeling back. Tarantula turns as to his side
as Izumi tries to flank him, deflecting her attacks with his fists and feet. He jump kicks her in the face, punches All Might again when he tries to charge in and blasts him in the chest with a fireball, knocking him down.)

(Izumi tries her luck against Izuku, but he combines Fire and Lightning and easily knocks her out.)

(Katsuki prepares to face Izuku.)

Tarantula: To think you became a villain...

Katsuki: SHUT UP, DEKU! THIS IS ALL YOUR FAULT! YOU RUINED MY DREAMS! YOU RUINED MY LIFE! ONCE I'M DONE WITH YOU, I'LL GET MY LIFE BACK IN THE NEW ERA!!

(They fight. Even with Katsuki's powerful quirk years of battle experience, Tarantula had bested him before. And even with the power of Kronika, it proves to be no match for the Shirai Ryu Firebender that is Izuku Hasashi. Taking advantage
of his newfound abilities, he quickly finishes the fight and leaves Katsuki down on the ground.)

Tarantula: This is our last fight!

(Then All Might comes in)

All Might: The Shirai Ryu corrupted you...

Tarantula: Wrong. They saved me from the living hell. And Hanzo was a better father than you ever were!

All Might: In the new era, We will be father and son again. And I will be a God!

(They fight. While All Might has lost none of the speed and ability
that carried him to his former position as the number one hero, and is powered up further by Kronika's machinations, it turns out to be his ego that is too big for him. The Shirai Ryu Firebender Izuku Hasashitakes the fight to his former father and defeats him in short order.)

Izuku: You're not my father anymore! You're dead to me!

Kronika: Damn you, Izuku.

Tarantula: I thought you didn't fear anything!

Kronika: Izumi!

Izumi: As you wish.

(Then the former siblings are face to face)

Izumi: Since you left, I started thinking about the times we could have spent, brother. And then I gave myself a mission to get you back so we could be a family again. And this led me to think... "Why treating you like a brother if I can make you my husband?"

Izuku: I will never marry you!

(They fight. With her powers, Izumi should indeed be a match for the Shirai Ryu Firebender Izukj. But
the battle does not sway that way, because Izuku is more powerful than ever and he takes full advantage of the internal conflict raging in Izumi's mind. Slipping past her attacks and
into her defenses, Izuku manages to do the impossible and overpower his former sister, knocking her to the floor.)

Izuku: Now it's you and me, Kronika!

Kronika: You can't WIN!!

(She turns to the hourglass and uses her time powers once again. The sand continues to flow upwards, increasing in speed. Izukj rises to his feet and Kronika looks over at him again.)

Kronika: History rewinds, giving way to the New Era!

Tarantula: NO!

(Around them, Kronika's Keep suddenly fades away, as they and the
hourglass are transported through time and through realms, emerging in pre-historic Earthrealm. They appear in a luscious and beautiful forest, with a dead dinosaur in the background. The area surrounding the hourglass is distorted, seemingly opening out into space. Kronika hovers above Izukj, slowly coming down to ground level.)

Kronika: The realms as you knew them are undone. Erased. You cannot save a future that no longer exists! There is only the New Era!

(They fight. The battle is truly epic, with neither Izuku nor Kronika getting any clear advantage for the majority of it. For what seems like an age, the Shirai Ryu Firebender and the architect of the Mortal Kombat universe fight with every power they have, but eventually Izuku prevails and knocks Kronika to her knees. She
struggles to her feet.)

Tarantula: The realms will not fight your endless wars.

Kronika: Fight me further and your friends are lost. They have no future unless I create it.

Izuku: The future you offer is not worth living! It will Not come to pass!

(They fight. Once again, the battle proves to be a meeting of two unstoppable forces. But this time Izuku overpowers Kronika and knocks her to her knees.)

(As Kronika rises, Tarantula charges up a fireball and blasts her straight in the chest. He shoots three more, each striking the helpless Kronika, before charging up a final blast that shoots
out from his hands like a flamethrower. The blast engulfs Kronika entirely, and when it ends we see that her entire body has molded
into what looks like molten organic glass.)

(Izuku approaches the now crystalline form of Kronika. He chops her outstretched hand, shattering her arm to the elbow, then repeats the motion with her other arm, shattering that too. Growling in fury, he roundhouse kicks her across the face, and her entire head explodes into pieces. He then contemptuously pushes down what remains of her body, letting it break apart completely upon impacting with the ground.)

(With the Titan of Time lying dead at his feet, Izukj closes his eyes, trying to find focus again.)

Aang: Our work is finished, Izuku Hasashi.

(Izuku then turns around and sees Aang.)

Tarantula: Avatar Aang.

(Both bow at each other)

Tarantula: Where do we go from here?

Aang: The sands of time are yours to shape. You must return the hourglass to the dawn of time and sculpt a new history. A better one.

Izuku: The fate of all realms... in my hands? Aang, I cannot do this alone.

Aang: Yes. You will need a partner with whom you can share the eons.

Izuki: Ty Lee.

Aang: Your destinies have always been intertwined.

(Izuku walks toward the hourglass.)

Tarantula: We are far in the past, but not so far that I cannot reach her.

Aang: Return with her to the dawn of time. Sculpt the hourglass' sands to forge a better future. I look forward to meeting again, in the next timeline.

Tarantula: Then I will not say goodbye.

(Both men smile at each other, then Izuku levitates into the air, glowing with flames. Power begins to flow out of the hourglass as he raises his hands toward it.)

(Good Ending)

(The scene cuts to the dawn of time. Standing on a single rock in the middle of space is Liu Kang, with the hourglass in the background... until another hand slides into his. He turns to face his true love Ty Lee and smiles at her.)

Izuku: Are you ready?

Ty Lee: Yes. But no matter how we sculpt the Sands, we cannot plan for every possibility. Mortals will make their own choices. New evils will arise.

Izuku: Each realm must choose its own destiny. Whatever those choices... we will face them together.

(As a nearby sun flares into being, it outlines both of them, hand in hand... and for maybe the first time in the history of Mortal Kombat, My Hero Academia and Avatar: The Last Airbender, the future looks to be a bright one.)

((Another) Good Ending)

(We see Union Academy, but with Scorpion's statue, implying that in the new era, Hanzo Hasashi is the number one hero. Then we see Izuku walking alongside his grown up brother Satoshi.)

Satoshi: Father would be so proud of us. Following his footsteps.

Izuku: Yes, brother. He is a great hero, and we are here, ready to be heroes like him.

(Then a female voice is heard)

????: Izuku Hasashi?

(Then Izuku and Satoshi turn around and see a female figure.)

Izuku: Who are you? How do you know my name.

????: I am the one who was once a great heroine.

Satoshi: You're... Nana Shimura?

(Izuku then bows)

Izuku: Sorry for not recognizing you, Ms. Shimura.

Nana: Don't need to apologize.

Satoshi: So... What do you want with my brother?

Nana: I need to train him.

Izuku: Train me? What for?

(Nana then smiles)

(The End)