[the Avengers are on an aircraft heading out of Sovokia, Natasha interrupts Banner who's listening to opera on his headspeakers]

Natasha Romanoff: Hey, the lullaby worked better than ever.

Bruce Banner: Just wasn't expecting the Code Green.

Natasha Romanoff: If you hadn't been there, there would've been double the casualties. My best friend would've been a treasured memory.

Bruce Banner: You know, sometimes exactly what I want to hear isn't exactly what I want to hear.

Natasha Romanoff: How long before you trust me?

Bruce Banner: It's not you I don't trust.

Natasha Romanoff: Thor, report on the Hulk?

Thor: The gates of hell are filled with the screams of his victims. [Banner groans in despair] Uh, but, not the screams of the dead, of course. No no, uh...wounded screams, mainly whimpering, a great deal of complaining and tales of sprained deltoids and, and uh... and gout.

Tony Stark: Hey Banner, Dr. Cho's on her way in from Seoul, is it okay if she sets up in your lab?

Bruce Banner: Uh, yeah, she knows her way around.

Tony Stark: Thanks. [to Jarvis] Tell her to prep everything, Barton's gonna need the full treatment.

Jarvis: Very good sir.
Tony Stark: Jarvis, take the wheel.

Jarvis: Yes, sir. Approach vector is locked.

Tony Stark: [looking at the specter] It feels good, yeah? I mean, you've been after this thing since S.H.I.E.L.D. collapsed. Not that I haven't enjoyed our little raiding parties, but...

Thor: No, but this...this brings it to a close.

Steve Rogers: As soon as we find out what else this has been used for. I don't just mean weapons. Since when is Strucker capable of human enhancement?

Tony Stark: Banner and I'll give it a look once before it goes back to Asgard. Is that cool with you? [Thor nods his head] I mean, just a few days until the farewell party. You're staying right?

Thor: Yes, yes, of course. A victory should be honored with revels.

Tony Stark: Yeah. Who doesn't love revels. Captain?

Steve Rogers: Hopefully this puts an end to the Chitauri and Hydra, so. Yes, revels. [the Avengers aircraft lands at the Avengers headquarter where Barton is taken to have his wound tended to; Maria walks up to Stark]

Maria Hill: Lab's all set up boss.

Tony Stark: [pointing to Steve] Uh, actually, he's the boss. I just pay for everything, and design everything and make everyone look cooler.

Steve Rogers: What's the word on Strucker?

Maria Hill: NATO's got him.
Steve Rogers: The two enhanced?

Maria Hill: Wanda and Pietro Maximoff. Twins. Orphaned at ten when a shell collapsed their apartment building. Sokovia's had a rough history. It's nowhere special but it's on the way to everywhere special.

Steve Rogers: Their abilities?

Maria Hill: He's got increased metabolism and improved thermal homeostasis. Her thing is neural electric interfacing, telekinesis, mental manipulation. [Steve looks at her]

Maria Hill: He's fast and she's weird.

Steve Rogers: Well, they're going to show up again.

Maria Hill: Agreed. File says they volunteered for Strucker's experiments. It's nuts.

Steve Rogers: Right. What kind of monster would let a German scientist experiment on them to protect their country?

Maria Hill: We're not at war, Captain.

Steve Rogers: They are.

Bruce Banner: [in Banner's lab; referring to Barton] How's he doing?

Tony Stark: Oh, unfortunately, he's still Barton.

Bruce Banner: That's terrible.
Tony Stark: He's fine. He's thirsty. Alright. Look alive Jarvis. It's play time. We've only got a couple days with this joystick so
let's make the most of it. Update me on the structural and compositional analysis.

Jarvis: The scepter is alien. There are elements I can't quantify.

Tony Stark: So there's elements you can.

Jarvis: The jewel appears to be a protective housing for something inside. Something powerful.

Tony Stark: Like a reactor?

Jarvis: Like a computer. I believe I'm ciphering code.

Natasha Romanoff: [to Dr. Cho as she tends to Barton's wounds] You sure he's going to be okay? Pretending to need this guy really brings the team together.

Dr. Helen Cho: There's no possibility of deterioration. The nano-molecular functionality is instantaneous. His cells don't know they're bonding with simulacrum.

Bruce Banner: She is creating tissue.

Dr. Helen Cho: If you brought him to my lab, the regeneration cradle could do this in twenty minutes.

Tony Stark: Oh, he's flatlining. Call it. Time?

Clint Barton: No, no, no. I'm going to live forever. I'm gonna be made of plastic. [Stark hands Barton a drink]

Tony Stark: Here's your beverage.

Dr. Helen Cho: You'll be made of you, Mr. Barton. Your own girlfriend won't be able to tell the difference.

Clint Barton: Well, I don't have a girlfriend.

Dr. Helen Cho: That I can't fix. This is the next thing, Tony. Your clunky metal suits are going to be left in the dust.

Tony Stark: Well, that is exactly the plan. And Helen, I expect to see you at the party on Saturday.

Dr. Helen Cho: Unlike you, I don't have a lot of time for parties. [she hesitates a moment before asking] Will Thor be there?

Bruce Banner: What's the rumpus?

Tony Stark: Well, the scepter. You see, we were wondering how Strucker got so inventive. So, I've been analyzing the gem inside you may recognize. [he brings up a 3D image of inside the scepter] Jarvis.

Tony Stark: Started out, Jarvis was just a natural language UI. Now he runs the Iron Legion. He runs more of the business than anyone besides Pepper.

Bruce Banner: Oh.

Tony Stark: Top of the line.

Bruce Banner: Yes.

Jarvis: I suspect not for long.

Tony Stark: Meet the competition. [he brings up another 3D image of what he's being working on]

Bruce Banner: It's beautiful.

Tony Stark: If you had to guess, what's it look like it's doing?

Bruce Banner: Like it's thinking. I mean this could be a...it's not a human mind, it...

Tony Stark: Um-um.

Bruce Banner: I mean, look at this? They're like neurons firing.

Tony Stark: Down in Strucker's lab I saw some fairly advanced robotics work. They deep-sixed the data, but... I gotta guess he was knocking on a very particular door.

Bruce Banner: Artificial Intelligence.

Tony Stark: This could be it, Bruce. This could be the key to creating Ultron.

Bruce Banner: I thought Ultron was a fantasy.

Tony Stark: Yesterday it was. If we can harness this power, apply it to my Iron Legion protocol.

Bruce Banner: That's a mad-sized if.

Tony Stark: Our job is "if." What if you were sipping margueritas on a sun-drenched beach turning brown instead of green. Not looking over your shoulder for VERONICA.

Bruce Banner: Don't hate, I helped design VERONICA.

Tony Stark: As a worst-case measure, right? How about a best-case? What if the world was safe? What if next time aliens roll up to the club, and they will, they couldn't get past the bouncer?

Bruce Banner: The only people threatening the planet would be people?

Tony Stark: I want to apply this to the Ultron program. But Jarvis can't download a data schematic this dense. We can only do it while we have the scepter here, that's three days, give me three days.

Bruce Banner: So you're going for artificial intelligence and you don't want to tell the team.

Tony Stark: Right. That's right, you know why, because we don't have time for a city hall debate. I don't want to hear the "man was not meant to meddle" medley. I see a suit of armor around the world.

Bruce Banner: Sounds like a cold world, Tony.

Tony Stark: I've seen colder. This one, this very vulnerable blue one? It needs Ultron. Peace in our time. Imagine that.

[Stark and Banner spend days working in the lab together but find no program that works] What did we miss?

Jarvis: I'll continue to run variations on the interface, but you should probably prepare for your guests. I'll notify you if there are any developments.

Tony Stark: Thanks, buddy.

Jarvis: Enjoy yourself, sir.

Tony Stark: I always do. [Stark leaves the lab to go to the party]

[We see Stark's failed experiment integrating itself successfully to the program]