5 years after you all went to Titan II and killed Thanos, Scott Lang came back from a place he referred to as the 'Quantum Realm'.

He was explaining about the possibility of time travel. You, Natasha, Steve and Scott go to see Tony and his family.

Scott: Now, we know what it sounds like...

Steve: Tony, after everything you've seen, is anything really impossible?

Tony: Quantum fluctuation messes with the Planck Scale, which then triggers the Deutsch Proposition. Can we agree on that?

Steve, Natasha, and you looked at him, confused. Science is barely any of their fields.

Steve/You: *Tony giving a drink to them* Thank you.

Tony: In Layman's terms, it means you're not coming home.

Scott: I did.

Tony: No, you accidentally survived. It's a billion to one cosmic fluke. And now you wanna pull off a... What do you call it?

Scott: *Trying to hide his pride* A time heist?

Tony: Yeah, a time heist. Of course, why didn't we think of this before? Oh, because it's laughable? Because it's a pipedream?

You: The Stones are in the past. We can go back and get them.

Tony: Even if it were possible, there will be consequences.

Natasha: We can snap our own fingers. We can bring everyone back.

Tony: Or screw it up worse than he already has, right?

You: I don't believe we would.

Tony: Gotta say, sometimes I miss that giddy optimism. However, high hopes won't help if there's no logical, tangible way for me to safely execute said time heist. I believe the most likely outcome would be our collective demise.

Scott: Not if we strictly follow the rules of time travel. That means no talking to our past selves, no betting on sporting events -

Tony: I'm gonna stop you right there, Scott. Are you seriously telling me that your plan to save the universe is based on Back To The Future?

Scott: *embarrassed* No.

Tony Good. You had me worried there. 'Cause that'd be horse shit. That's not how quantum physics works.

Natasha: Tony... We have to take a stand.

Tony: We did stand. And yet, here we are.

Scott: I know you got a lot on the line. You got a wife, a daughter. But I lost someone very important to me. A lot of people did. *His voice gets louder as he tries to sell his desperation to Tony* And now, now we have a chance to bring her back. Bring everyone back. And you're telling me that won't even...

Tony: That's right, Scott, I won't even. I got a kid.

Morgan runs to her dad, who picks her up.

Morgan Stark: Mommy told me to come and save you.

Tony: Good job. I'm saved. *Turning to face Cap, Nat, you and Scott.* I wish you'd come here to ask me something else. Anything else. Honestly, I... I missed you guys, it was... Oh, and table's set for six.

Steve/You: Tony, I get it. And I'm happy for you, I really am. But this is a second chance.

Tony: I got my second chance right here, Cap. I can't roll the dice again. If you don't talk shop, you can stay for lunch.

You, Cap, Nat and Scott walk back to the car outside Tony's house.

Natasha: He's scared.

Steve/You: He's not wrong.

Scott: Yeah, but I mean, what are we gonna do? We need him. What, are we gonna stop?

You: No, I wanna do it right. We're gonna need a really big brain.

Scott: *Incredulous, pointing to Tony's house* Bigger than his?

Cut to a cafe somewhere, we see Bruce Banner, but not the same one that we remember. He looks more... Professor Hulk.

Professor Hulk: Come on, I feel like I'm the only one eating. *pushing a plate forward* Try some of that. Have some eggs.

Scott: I'm so confused.

Professor Hulk: *seriously* These are confusing times.

Scott: Right. No, no, that's not what I meant.

Professor Hulk: *dropping the act* No, I get it. I'm kidding! I know. It's crazy. I'm wearing shirts now.

-Timeskip-

Steve sitting outside the Avengers Compound, staring at the floor, deep in thought. He looks beat, the only possibility of victory now not an opportunity. He looks up as a deafening noise breaks the silence in the distance. As he looks, we see an Audi R8 speeding towards the entrance. The car pulls over to Cap, but goes a bit too far, then reverses to Cap. We see Tony Stark roll down the window and look at Cap.

Tony: Why the long face? Let me guess: He turned into a baby.

Steve: Among other things, yeah. What are you doing here?

He gets out of the car, and walks around to the back.

Tony: That's the EPR Paradox. Instead of pushing Lang through time, you might've wound up pushing time through Lang. It's tricky. Dangerous. Somebody shoulda cautioned you against it.

Steve: You did.

Tony: Oh, did I? *acting like he did not* Thank God I'm here. Regardless, I fixed it. *He holds up his right hand, with a device on it*A fully functioning Time-Space GPS. I just want peace. *Makes peace sign with his fingers* Turns out, resentment is corrosive, and I hate it.

Tony: Me too.

Tony: We got a shot at getting these stones, but I gotta tell you my priorities: Bring back what we lost? I hope, yes. Keep what I got? I have to, at all costs. And... maybe not die trying will be nice.

Steve: Sounds like a deal.

Steve reaches out his hand to shake in the deal, in which Tony replies in the same way. Tony reaches back into his trunk to pull something else out, Captain America's Shield. He makes to give it to Steve, who hesitates.

Steve: Tony...

Tony: Why? He made it for you. *referring to Howard Stark* Plus, honestly I have to get it out of the garage before Morgan takes it sledding.

Steve fits his arm into the shield.

Steve: Thank you, Tony.

Tony: Will you keep that a little quiet? Didn't bring one for the whole team. *hesitates* ...We are getting the whole team, yeah?

Steve: We're working on that right now.

Cut to the Benatar landing in the yard of the Avenger's Compound. Scott is sitting having a Taco and some Nachos at a bench, and everything falls out of the taco as the Benatar lands. Nebula and Rocket walk out of the ship, and past Scott.

Rocket: Hey, humie! Where's Big Green?

Scott: Uh, Kitchen, I think. *To himself as he sees Nebula* That's awesome.

Nebula: *into an earpiece* Rhodey, careful on re-entry. There's an idiot on the landing zone.

She walks away. Moments later, just as Scott is getting back to his senses, Rhodey lands right in front of him without warning. This time Scott is so surprised, he drops the whole taco.

Scott: Oh, God!

Rhodey: What's up, regular sized man?

As Rhodey walks away, Bruce walks out of the Compound. Seeing that Scott dropped his lunch, he hands two tacos from his own lunch to Scott. Scott takes it while giving Bruce a puzzling look at this act of kindness.

Cut to Bruce sitting at the back of a Utility car as they traverse the green countryside of Norway. They pass a sign labelled "WELCOME TO NEW ASGARD, PLEASE DRIVE SLOWLY.". They stop at a small town on a port. Bruce and Rocket get out of the car, and look around at the remaining Asgardians, living like normal humans at a port.

Rocket: Kind of a step down from a from a golden palace for an Avenger highness and whatnot.

Professor Hulk: Hey, have a little compassion, pal. First they've lost Asgard, then half the people. They're probably just happy to have a home.

Bruce spots Valkyrie looking over at him, and heads over to her.

Valkyrie: You shouldn't have come!

Professor Hulk: Ah, Valkyrie! Great to see you, Angry Girl.

Valkyrie: *Noticing Bruce's change of appearance* I think I liked you better either of the other ways.

Professor Hulk: *motioning to Rocket* This is Rocket.

Rocket: How you doin'?

Valkyrie: *Eyeing Rocket* She won't see you.

Professor Hulk: That bad, huh?

Valkyrie: We only see her once a month, when she comes for... *looking over to a pile of kegs of stout and other beer on the side* ... supplies.

Professor Hulk: It's that bad.

Valkyrie; Yeah.

-Timeskip...... Again-

Scene cuts to the Avengers in a room with some hologram displays, showcasing each of the six Infinity Stones, sitting around a table. Tony, Steve and Bruce are pacing at the front, clearly leading the planning of the mission.

Steve: Okay, so the "how" works. Now we gotta figure out the when and the where. Almost all of us has had an encounter with at least one of the six Infinity Stones.

Tony: Well I'd substitute the word encounter for damn well near been killed by one of the six Infinity Stones.

Scott: I haven't, I don't even know what the hell you're all talking about.

Professor Hulk: Regardless, we only have enough Pym Particles for one round trip each, and these stones have been in a lot of different places throughout history.

Tony: Our history. So, not a lot of convenient spots to just drop in.

Clint: Which means we have to pick our targets.

Tony: Correct.

Steve: Let's start with the Aether. Lady Thor, what do you know?

We see Lady Thor sitting on a chair with her sunglasses on. It is impossible to tell whether she is awake or asleep.

Natasha: Is she asleep?

Rhodey: No, I'm pretty sure she's dead.

Lady Thor: Where to start? Umm... The Aether, first, is not a stone, someone called it a stone before. It's more of a... an angry sludge thing, so... someones gonna need to amend that. Here's an interesting story though, many years ago... My grandfather had to hide the stones from the Dark Elves... *she wiggles his fingers to imitate a spooky ghost* Wooooh, scary beings. So Jane, *An image of Jane Foster pops up on the screen* Oh, there she is. That's Jane... She's... an old friend of mine... She... she stuck her hand inside a rock this one time... and then the Aether stuck itself inside her... And, she became very, very sick. So I had to take her to Asgard, which is where I'm from. And we had to try and fix her. We were dating at the time, you see. I got to introduce her to my Mother... who's dead, *Lady Thor starts to look broken, and seems on the verge of tears* these things happen though you know, nothing last forever, *Tony starts to push him back to his chair* I'm not done yet, the only thing permanent in life is impermanence.

Tony: Awesome. Eggs? Breakfast?

Lady Thor: I'd like a Bloody Mary, thank you.

Cut to the Avengers sitting around a table, eating a meal, and Rocket is pacing on the table in front of everyone.

Rocket: Quill said he stole the Power Stone from Morag.

Scott: Is that a person?

Rocket: Morag's a planet. Quill was a person.

Scott: A planet? Like in outer space?

Rocket: Oh, look. It's like a little puppy, all happy and everything. *Imitating talking to a puppy* Do you wanna go to space? You wanna go to space, puppy? I'll get you to space.

You: Rocket! That's enough.

Rocket: Why should I? And you've been in you're room all this time now decide to join us?!

You: Because I've been having Cortana run the simulations on what happens. It's not good. For any of us.

Natasha/Steve/Tony: What do you mean?

You: What I'm about to say will change your futures. Natasha, you sacrifice yourself to get the Soul Stone, Tony, you snap Thanos and his army out of existence. Steve, you finally go back to the 40's and be with Peggy. Which is why I've called Carol to come help us.

Steve: That's not your call to make and tell us our future.

You: Captain, I've lived in Hell for centuries and I have always felt like I should change history for the betterment of mankind. Which is why I'll change when Natasha and Clint go to Vormir. They will go to there mere moments after Thanos obtained the Stone.

Natasha/Clint: Why?

You: So that way your family, Clint, can still have their aunt. When I killed the Icon of Sin I saw who will snap.

Tony: Who.

You: I can't tell you.

-Mini Timeskip-

We see Tony and Nat lying on a table surrounded by papers, and Bruce lying down on the floor. The Time Stone pops up on the display.

Natasha: That Time Stone guy...

Professor Hulk: Doctor Strange.

Natasha: Yeah, what kind of doctor was he?

Tony: Ear-nose-throat meets rabbit from a hat.

Professor Hulk: Nice place in the village, though.

Tony: Yeah. Sullivan Street.

Professor Hulk: Hmm... Bleecker.

Natasha: Wait, he lived in New York?

Tony: No. He lived in Toronto.

Natasha: Guys, if you pick the right year, there are three stones in New York.

Professor Hulk: *Sitting up in surprise* Shut the front door.

Shot cuts to the holograms displaying the different location, the Soul and Power Stones in space in 2014. the Reality Stone in Asgard, 2013; and the Space, Mind, and Time Stones in New York City, 2012.

Steve: All right. We have a plan. Six Stones, three teams. One shot.

He and the other Avengers walk up and look at the screens determinedly.

You: Wait, Carol should be here in 3... 2... 1.

As if you knew she would show up right on time and apparently Bruce and Nebula made an extra Quantum Suit in the event she came back to Earth.

Carol: Hey guys.

You: Your call, Cap.

Steve: Danvers, nice of you to join us.

The shot cuts to the Avengers walking in a file to the Quantum Time machine, wearing the Quantum Suits, albeit with some minor differences for different people. Rhodey has a bulkier repaint of the War machine armour. Same with your armor.

Steve: Five years ago, we lost. All of us. We lost friends... We lost family... We lost a part of ourselves. Today, we have a chance to take it all back. You know your teams, you know your missions. Get the stones, get them back. One round trip each. No mistakes. No do-overs. Most of us are going somewhere we know. But it doesn't mean we should know what to expect. Be careful. Look out for each other. This is the fight of our lives. And we're gonna win. *Tony gives Steve a look* Whatever it takes. Good luck.