Peter was swinging through the city chasing after a armored truck robbery and Miles is wearing his new suit for the first time in public.

The goons try shooting the heroes and they land on a roof and watch as the cops are chasing them.

"Okay, what's the game plan?" Miles asks Peter.

"Okay, you notice their pattern? They like to serpentine the streets. First left, then two streets later they go right. So if we can predict where they are, we can lead them into a trap." Peter says and quickly runs the variables in his head. "Head to second and maple street. I'll draw their attention." He says and Miles goes off to do his part.

Peter goes flying in and lands on their roof. "Hey, guys." He greets them and thy all start trying to shoot him down.

Peter just dodges the bullets as they shoot their windshield, he webs their guns out of their hands.

"You know, it's sad that you thought that would work." Peter states before leaping off the car and they run into a gigantic web that Miles placed to trap them.

"Hey, according to nature, doesn't this mean we have to eat them now?" Miles asks while hanging upside down on a web and Peter waits for the police's arrival.

"Nice quip." Peter says and gives Miles a fist bump.

"Thanks for the help, Spider-Man." One of the officers say and the two of them swing off.

"There's two of them now?" Another Officer asks, completely confused.

"Hey, as long as they're on our side." Another states, not caring how many their are.

-

Peter comes back to Star labs with Miles to elaborate on his work, but right now Miles is freaking out about how awesome it was.

"That was amazing. You were dodging bullets, taking names and I was all thwip, thwip and trapped them!" Miles cheers in his first successful fight ever since he got his powers.

"You're learning faster than I anticipated. Just keep doing what you're doing, you're an amazing Spider-Man." Peter assures him.

"Hey, I'm the Ultimate Spider-Man, you're the Amazing Spider-Man." Miles corrects him and looks at the time. "Oh, I've gotta get going. I'll catch up later." He says and leaves.

Cisco is just slurping his coffee watching their interaction.

"I guess someone is loving having a protege around." Cisco notices.

"Miles is a great kid, just needs to learn to be patient." Peter assures Cisco.

"Kid and patience. Not two words that like to work together." Barry says when they hear something beeping and look to Caitlin.

"You doing okay, Cait?" Peter asks her.

"Yeah, it's just these things have just been on the fritz lately." Caitlin explains. "It makes me feel like a criminal."

"It hasn't been on the fritz, Okay? Maybe if you charged the battery, like I told you to." Cisco tells her.

"Oh, I'm just supposed to hook myself to an outlet like I'm some sort of human tablet?" Caitlin asks him.

"Cait, if you don't charge them, you're gonna turn into another Frozone." Peter states agreeing with Cisco when Caitlin walks up to him.

"Or...you could fix them for me?" Caitlin asks puffing out her eyes and lips and Peter just can't say no to that face.

"Or...I could...fix them." Peter says slowly as ideas come into his mind. "You know, maybe instead of that, we could make like a secondary power source." He starts thinking and Cisco walks up to Barry.

"Did she just Jedi mind trick him?" Cisco asks Barry.

"Yeah, she totally just Jedi mind tricked him." Barry informs him laughing at how Peter, the man who has defeated the six major enemies alone, can't say no to his girlfriend.

-

Later, they get an alert of a robbery at the Diamond exchange and the heroes go in to stop him.

"Listen buddy, I'm training someone now. So I can't constantly stop the training to keep fighting thugs like you." Peter says when Barry shows up and faces the man and he looks exactly like the guy from the future newsreel article.

Barry freezes seeing him and Peter notices that when the guy pulls out a sonic blasts gun and shoots the heroes and Peter shields Barry when they get blasted.

-

They return to Star labs so see what they know about this new guy.

"That gun, I've never seen anything like that in my life. I want a gun like that." Cisco states.

"Hey, what happened out there?" Peter asks Barry.

"Your telemetry readings dropped precipitously." Caitlin tells him.

"It caught me off guard." Barry explains to his friend.

"Okay, so we're going up against a guy with a futuristic rifle that's stealing jewelry and looks like a pirate." May recaps.

"A pirate you say? Well then, we shall call this scurvy lad boy the name of Plunder. Plunder, agreed?" HR asks sounding like a pirate.

"Shouldn't you be focusing on your museum, or something?" Cisco asks.

"Aren't you suppose to be helping me, Francisco, with me hologram?" HR asks, still talking like a pirate.

"That's not my problem." Cisco states.

"Anyway, I'm gonna get CCPD on the monitor all the jewelry stores in the city." Joe tells them. "This guy must be pretty full of himself, so knowing he escaped Flash and Spider-Man, he's most likely to be back."

"And when he is, we'll be ready for him, right guys?" Wally asks them.

"Yeah, man." Peter says, agreeing.

"No, not we." Barry tells them. "Peter, you should focus on Miles more in case anything worse happens. Wally, just trust me, Okay?"

Peter and Wally are completely confused about why he's pushing them both away and both decide to agree, but they're gonna keep an eye on him.

-

Caitlin has gone to Lucius to see what he has learned about her blood work.

"This small fraction in your blood is an entirely different anomaly than any meta human bloodstream." Fox tells her what her found. "In reality, Killer Frost isn't from the dark matter. It's actually a closer parallel to Peter's radioactive spider bite." He explains to her.

"Then where did she come from?" Caitlin wonders.

"I was hoping you could tell me." Fox admits and sits down next to her. "There anything strange about your family, suddenly disappearing, vanishing, things like that?"

"My dad, he got sick and died when I was young. But other than that, nothing." Caitlin says.

"Well, I'll keep looking into this, and that power source you asked for." Fox promises and Caitlin leaves.

-

Meanwhile, Plunder was robbing the hotel and Barry finds him on the roof.

"You just couldn't resist another heist, huh?" Barry asks him.

"What's the fun in one and done?" Plunder asks him.

"Avoiding a fifteen year jail sentence in Iron Heights would've been nice, but you're forcing my hand. I guess it's a little late for that now." Barry tells him.

"Guess again." Plunder says and starts shooting him.

Barry avoids the hits and punches Plunder in the face.

But the bullets that he was shooting were advanced speed seeking ones so it took an extra minute to dodge them.

Barry looks and sees he's still unconscious and wonders if he should catch him, maybe letting him go will save iris' life.

But that agreement becomes obsolete as Peter and Wally speed in and web Plunder and Wally grabs the gun before it could shoot Barry again.

"I caught that whole thing, man." The worker says holding his camera up. "Anything you wanna say to the camera?" He asks Wally.

"For real? Okay, what's up, Central City? Names Kid Flash." Wally says while chuckling and Peter picks up Plunder and lets the Flash kid have his moment.

-

The three return to Star labs and they're all congratulating Wally on his first bad guy while Barry is angry that he was caught.

"Wally, congratulations, my man." Peter tells him as they enter the cortex.

"Great job, Wally." Caitlin says.

"Kid Flash! Let 'em know!" Cisco cheers.

"Well, I just exchanged Plunder for one empty Iron Heights cell." Peter tells them.

"His real name is Jared Morillo. Turns out he's wanted for a string of robberies from here to Star City." Joe informs them.

"What was that?" Barry asks the two of them. "I told you two I'd handle it."

"You're mad for your partner watching your back, like a good partner?" Peter asks him.

"You were supposed to be helping Miles out, weren't you?" Barry questions him.

"Dude, he does have school nights." Peter tells him. "What aren't you telling us?" He questions.

Barry looks at the group and knows that he needs to tell them.

"When I threw the stone into the Speedforce, I was thrown into the future. I saw Savitar...and I wasn't fast enough to save Iris from him." Barry admits to them.

"How can that be? We got rid of the stone." Wally states.

"I don't know." Barry tells them.

"What does this have to do with Robocop?" Peter asks.

"He was already in jail in the future. So I thought if we didn't catch him, that I could stop the timeline from happening. Prevent her death." Barry admits.

"So you're willing to put dozens of people in danger, let criminals go free if it means you get to save one life?" Peter asks him, never thinking that he would do something like that.

"Jay said that her death was one of infinite possible futures. But it's supposed to happen in four months." Barry tells them. "So that gives us plenty of time to stop it."

"Barry, changing the future is harder to do than you think." Peter informs him. "It's not like Back to the Future where some small change has major consequences like traveling to the past. Think of a row of domino's." He was saying when Cisco hands him some dominos.

"You just happened to have those on you?" Peter asks.

"Just continue." Cisco says and Barry quickly sets the dominos up so he can continue.

"Imagine that these dominos each resemble a moment in time. One moment leads to the next, then so on and so on. Leading to the conclusion." Peter explains and hits the dominos and they all fall.

"And what if we tried changing the event?" Barry asks.

"There are two possible outcomes, ironically. One is that you change everything, no questions asked. Like in Back to the Future. The second is if you are gonna cause that event to happen."

"Like how Anakin saw Padme dying and tried to save her, but ended up being the one to cause it in Revenge of the Sith." May states.

"Exactly." Peter says pointing to his aunt who gets it.

"We need to figure out everything that happens leading up to Iris' death." Barry tells them. "When I saw the future, there was a news scroll on TV. That might be able to offer some clues."

"I think I can help with that." Cisco says.

-

The team sets up the device which was recycled from the device they used on Julian.

"Just sit back and try to relax. Concentrate on the exact date to the future guy traveled to." Cisco tells Barry.

The two then enter the vibe and are on the street where Barry came from as he just arrived.

They walk and see the news report and the headlines.

"Call the headlines, I'll write them down." HR tells them.

"Music Meister gets six figure book deal." Barry calls out.

"Luigi's opens after murder." Cisco sees.

"Joe West honored at City Hall." Barry calls out.

"Killer..." Cisco was saying and that gets Peter and Caitlin's attention.

"What does it say?" Caitlin asks him.

"Killer Frost still at large." Cisco says and Peter places a comforting hand on hers.

"Star labs museum closes." Barry sees.

"City still recovering following gorilla attack." Cisco says when they hear Future Barry call out and then they turn and see Savitar and Iris.

But they now look near Barry and see Peter is on the ground bleeding.

"Peter's here and he doesn't look so good." Barry says and runs over to his friend and doesn't know what to do. His mask is torn, one of his eye sockets are missing, and his mouth is visible and his right arm looks like it was slashed straight down the middle. "He wasn't here before, this doesn't make any sense."

"Look, up on the roof." Cisco says and Barry looks and they see HR with Harry's speedster weapon.

"HR wasn't here either." Barry says.

"The future has changed since you showed up." Cisco says and they see Savitar kill Iris before leaving.

"You had a rifle pointed at Savitar. Somehow telling you all about iris' death, it changed the future." Barry tells them.

"Then it looks like the future can be changed." HR says.

"And Iris' isn't the only one that needs to be changed." Peter says looking to Caitlin.

"These headlines, they tell us what happens in the future where Caitlin becomes Killer Frost and Iris dies." Barry says seeing what HR wrote.

"If we change the headlines, we change the future." Caitlin adds.

"I'm on board." Peter states, wanting to keep Caitlin safe.

But will in the event of trying to stop this future, will they cause it to happen?

-

Later, Caitlin returns home and Peter was there talking to Fox whole holding a package.

"What are you boys doing here?" Caitlin asks the men.

"We have been working on your battery problem with the cuffs. And we have invested in this alternate accessory." Peter says and Fox opens the box and shows a necklace in the shape of a snowflake.

"Powered by solar energy and it'll charge the cuffs wirelessly." Fox tells her. "The snowflake and necklace was all his idea." He admit looking to Peter.

"May I?" Peter asks and taking out the necklace and Caitlin moves her hair so that Peter can put it on her.

"Thank you, guys." Caitlin says and hugs Fox before kissing Peter.

"I'd move the sun and the stars for you, Caitlin." Peter says and Fox leaves the two of them alone, not wanting to be the third wheel to that.