You drum your fingers on your thigh as you wait in the Quinjet for word from Steve. You listen in to his conversation with Cho with growing horror.

"A body implanted with a gem with uncontainable power," You mutter, "Great."

"Did you guys copy that?" Steve asks over the comms.

"We did," Barton responds while Natasha looks over some specs on a tablet.

"I got a private jet taking off across town. No manifest. That could be him."

"There!" Clint says, and you turn to look at the truck leaving the lab, "It's the truck from the lab. Right above you Cap. On the loop by the bridge. It's them. I got three with the Cradle, one in the cab. I could take out the driver."

"Negative! If that truck crashes the gem could level the city. We need to draw out Ultron." Steve leaps onto the roof of the truck.

"Well he's definitely unhappy! I'm gonna try and keep him that way." You tense as you watch Steve trying to enter the truck.

"You're not a match for him, Cap."

"Thanks, Barton." Ultron hits Steve and you're on your feet, but to your relief he manages to climb back onto the truck's roof.

"We got a window," Clint says, and you climb onto the back of a bike with Natasha, "Four, three….give 'em hell guys." There's a moment of free fall, and then the bike's tires hit the ground. Natasha scoops up Steve's shield as you pass it.

"Always picking up after you boys," Natasha says.

"They're heading under the overpass, I've got no shot."

"Which way?"

"Hard right… Now." You lean into the abrupt turn with her, and she throws Steve back his shield which he uses to knock Ultron away from him.

"Watch out," You call to Natasha as you come into a pedestrian filled area.

"Out of the way! Coming through! Sorry, coming through!-Clint, can you draw out the guards?"

"Let's find out." The sentries leave the truck and go after Barton, leaving your way to the truck clear.

"Cap, can you keep him occupied?"

"What do you think I've been doing?" Steve asks, and you roll your eyes.

"I'm going in," Natasha tells you, "Go help Cap." You hop off the back of the bike, landing next to Steve on the train.

"Heard you were having trouble, thought I'd come get myself a piece," You tell him, facing off against Ultron.

"Wait-" Steve says, as Wanda and Pietro show up on the train.

"Please. Don't do this," Ultron tells them, and Wanda's eyes narrow.

"What choice do we have?" After a moment's hesitation Ultron flies off and you and Steve both let out a breath.

"Nat! Cap, you see Nat?" Clint's slightly panicked voice sounds in your ear.

"If you have the package, get it to Stark! Go!"

"Do you have eyes on Nat?" Barton repeats. Steve looks at you and you shake your head.

"Go!" You watch as the Quinjet takes off.

"Civilians in our path." Steve warns, and you watch somewhat dumbfounded as Pietro speeds away, moving civilians out of the way of the train as Wanda uses her powers to slow and then stop the train.

"I'm fine. I just need a minute," Pietro pants in response to his sister's concern. You level your gun at the red haired woman, your finger itching to pull the trigger.

"And I'm very tempted not to give you one," Steve frowns and meets your eyes, giving his head a small shake before turning back to the newcomers. Your lip twitches slightly as you lower the gun, thumbing the safety back on.

"The Cradle, did you get it?"

"Stark will take care of it."

"No, he won't." Wanda argues.

"You don't know what you're talking about. Stark's not crazy."

"He will do anything to make things right."

You bite your lip, "Steve…"

Turning away, Steve calls out into the comm, "Stark, come in. Stark? Anyone on comms?"

"Ultron can't tell the difference between saving the world and destroying it. Where do you think he gets that?"

"We need to get back," You tell Steve. You don't believe Tony will do anything to make this worse but…

"The genetic coding tower's at ninety-seven percent. You have got to upload that schematic in the next three minutes," You hear Bruce's voice, and Steve pushes past you to get into the lab.

"I'm gonna say this once."

"How about nonce?" Tony suggests.

"Shut it down!"

"Steve-" Bruce tries.

"Nope, not gonna happen."

"You don't know what you're doing."

"And you do?" Banner asks, "She's not in your head?"

"I know you're angry," Wanda tries.

"Oh, we're way past that. I could choke the life out of you and never change a shade." Banner growls.

"Banner, after everything that's happened…" Steve says, but Tony cuts him off, "That's nothing compared to what's coming!"

"You don't know what's in there!" Wanda cries.

"This isn't a game…"

"The creature!" A sudden breeze whips across your face and suddenly pieces of the lab equipment are flying.

"No, no. Go on. You were saying?" Pietro says, coming to a stop. Barton draws his gun and fires at the floor beneath his feet, sending him downwards.

"Pietro!" His sister cries.

"What? You didn't see that coming?" Barton mocks.

"Go ahead, piss me off." Banner growls at Wanda.

"Guys-" You call out, but Thor's already on the Cradle, and he slams his hammer down, sending bolts of lightning throughout the machine. You watch with wide eyes as the body inside grabs Thor, flying backwards and throwing him before he stops suddenly.

"I'm sorry, that was...odd." He looks at Thor, "Thank you."

"Thor, you helped create this?" Steve asks dubiously.

"I've had a vision. A whirlpool that sucks in all hope of life and at its center is that," He points to the glowing gemstone in the center of the android's head.

"What, the gem?" Banner asks.

"It's the Mind Stone," Thor clarifies, "It's one of the six Infinity Stones, the greatest power in the universe, unparalleled in its destructive capabilities."

"Then why would you bring it to…" Steve starts.

"Because Stark is right."

"Oh, it's definitely the end times," Banner says.

"The Avengers cannot defeat Ultron." Thor says simply.

"Not alone," Vision states.

"Why does your Vision sound like JARVIS?" Steve asks Tony.

"We reconfigured JARVIS' matrix to create something new."

"I think I've had my fill of new," Steve states.

"You think I'm a child of Ultron?" Vision asks.

"You're not?" Steve counters.

"I'm not Ultron...I'm not JARVIS...I am...I am…"

"I looked in your head and saw annihilation," Wanda says darkly.

"Look again."

"Yeah, her seal of approval means jack to me," Clint cuts in.

"Their powers, the horrors in our heads, Ultron himself. They all came from the Mind Stone, and they're nothing compared to what it can unleash. But with it on our side…"

"Is it? Are you? On our side?"

"I don't think it's that simple," Vision says.

"Well it better get real simple real soon." Barton growls.

"I am on the side of life. Ultron isn't. He will end it all."

"What's he waiting for?" Tony demands.

"You."

"Where?" Banner asks.

"Sokovia," Clint answers, "He's got Nat there too."

"If we're wrong about you...If you're the monster that Ultron made you to be…" Bruce starts, and Vision steps forward.

"What will you do?" He looks around and all of your faces, and after a long pause continues. "I don't want to kill Ultron. He's unique, and he's in pain. But that pain will roll over the Earth, so he must be destroyed. Every form he's built, every trace of his presence on the net. We have to act now. And not one of us can do it without the others. Maybe I am a monster. I don't think I'd know if I were one. I'm not what you are, and not what you intended. So there may be no way to make you trust me. But we need to go." Your gaze falls to Thor's hammer clenched in his fist, and Thor's face splits into a grin as Vision hands it to him.

"Right," Thor says, patting Stark on the shoulder, "Well done."

"Three minutes. Get what you need." Steve says with a sigh. Tony climbs into the suit and flips up the mask to look at Steve.

"No way we all get through this. If even one tin soldier is left standing, we've lost. It's gonna be blood on the floor."

"I got no plans tomorrow night," Steve says.

"I get first crack at the big guy. Iron Man's the one he's waiting for."

"That's true," Vision says walking past, "He hates you the most."

Steve turns to look at you as the others head toward the jet, and you sigh.

"Skip the, 'I know this isn't what you signed up for' speech Steve," You tell him, "In for an inch, in for a mile."