This "Jay Garrick" explained how the man, Atom Smasher, was sent to kill the Flash and Spider-Man from another earth that was caused by the singularity last year that created a portal connecting their two worlds.

On that world, Jay Garrick was a speedster and they called him the Flash. The man that Atom Smasher warned them about, Zoom, and Jay were in a fight and he was dragged into the portal and lost his speed.

He also goes on to explain that he has been spying on everyone in the room and they decide to run some tests to see if he's telling the truth about all of this.

Caitlin has decided to give him a lie detector test while checking on him to see if he truly was once a speedster. "Is any of this possible?" Iris asks everyone while they watch Jay and Peter is keeping an extra close eye on him, since there's something about him making his senses scream dangerous.

"A portal to another earth. Is he talking about some sorta multiverse?" May wonders since she doesn't understand most of what they're talking about, but she does watch sci-fi to know about the multiverse.

"Just recently, the many different worlds theory proposed interaction with parallel universes was plausible. Now, if what mr. Garrick's saying is true, that theory has been proven sooner than we all thought." Stein says and Joe is completely lost, along with Iris since they don't watch sci-fi.

"So what Jay is saying is he's from a mirror world. Like a earth similar to ours, but still different." Cisco tries explaining in his own way.

"The multiverse, as ms. Parker has suggested, is a more apt description." Stein says agreeing with what May said.

"Please, Professor, call me May." May tells Stein who understands.

"That isn't helping." Joe tells them and Stein draws on a whiteboard two circles to explain different universes and how there are a infinite number of different earths and they're all slightly different and Joe calls it quits on trying to understand and heads back to the station.

"There is one problem that remains." Stein warns them and they know there's always a catch. "If what mr. Garrick is telling the truth, there is a breach somewhere in Central City that we need to find and close for good." Stein tells the team and they understand but have no idea how to find it.

Caitlin comes in as Cisco and Stein leave to find a solution to find the breaches. "Anything?" Peter asks her as she walks up to him.

"Well, Jay's heart rate is extraordinary low and he does have regenerative capabilities. Other than that, there's no evidence of the Speedforce in his system." Caitlin explains what she was able to find.

"So no proof of being a speedster, or from another earth." Peter recaps for her and she disagrees and explains how she gave him the lie detector test and he passed it. Peter believes her, but his senses are constantly warning him Jay is hiding something. Yet again, it could be he's being too paranoid, or possibly it's because his senses have never picked up someone from another world.

"You mind if you kept running some tests? My senses are warning me something isn't right with this guy." Peter explains and she knows by now to trust his senses.

In the meantime, Peter put Jay in the pipeline just in case he tries something.

"I hope you understand why I have to do this." Peter states to Jay.

"I get it, kid. You're doing what you think you have to for your family. But you'll realize soon enough that this, the tests, it's unnecessary." Jay says and Peter wishes he could believe him. "I want to help you, not harm anyone." Jay promises.

"Yeah, I get that, but my senses have never been wrong before and ever since you shown up they've been warning me to get as far away from you as possible." Peter informs him since he knows his senses never lie. Maybe a little off, but they don't lie.

"If what you told me about Zoom is true, that he sent Rothstein here to kill you and Barry, instead of locking me up in here, you better start listening. Because if Zoom is involved, you're gonna need a lot more than just me at your side to stay alive." Jay states and Peter just closes the doors and heads to help Barry with a fire.

At the fire site, fire department has just made it as Barry and Peter enter and take it out. "That was the most easiest...oh." Peter states as once again, his senses go off and a fist of sand hits him and Barry backwards and they see a man forming out of it.

"Is this your Sandman enemy?" Barry asks, referring to William Baker, the Sandman.

"Nope. He got disintegrated years ago. New guy." Peter informs Barry as they get back up to fight this guy.

"I thought it would be harder than this." The man says and sends another punch their way, Peter shoots a taser web and turns his sand into glass. Barry takes that as an opportunity to speed in and punch him, but he disappears at the last second.

"This could be a problem." They both say and don't have any idea what they just witnessed.

Barry returns with a sample of the sand taken by a new girl at the CCPD named Patty Spivot while Caitlin and Peter are checking up on Jay to learn anything from him while he's on Cisco's treadmill.

"His blood pressure is low, his heart rate is low, his oxygen levels are impressive. But nothing like or even similar to Barry's." Peter informs Caitlin and she agrees and they tell Jay to call it quits.

Barry and Cisco are looking at what the sand could be as the others join them. "I mean, it's gotta be from the metahuman that attacked us." Barry states and Peter agrees.

"What is this stuff? Sand?" Cisco questions since it looks like it is.

"It's not sand." Jay tells them as he exits the treadmill room with one of Peter's sweatshirts. "It's human cells whose myosin ll protein have migrated to the cell's periphery." Jay explains and they didn't know he was a scientist.

"Jay's a fellow scientist." Caitlin explains since she discovered that during the lie detector test.

"Those cells have the ability to rearrange and harden, giving them the appearance of sand." Jay explains.

"And you know this how?" Peter asks since he has a little bit too much information on a new guy.

"They belong to a metahuman I fought before named Sand Demon." Jay explains and Peter referred Sandman's name.

"I know you're new here, so I'm gonna break it down for you." Cisco states to Jay. "The whole naming the bad guys thing, that's my jam. But you know what? I'm gonna let you have that one, because I actually like that. Is that Peter's sweatshirt?" Cisco wonders seeing it also.

"Oh, sorry, it was all we could find that could fit him." May explains since they didn't want the guy walking around shirtless.

"I was gonna say, 'cause it looks a little big on you, right?" Cisco wonders and starts thinking just how buff is Peter compared to Barry and leaves them.

"Who is Sand Demon?" May asks Jay.

"I don't know his name, but I know how to stop him." Jay states and Peter remembers how he was weakened by his electric webs.

"I think we'll be fine on our own." Peter states still doesn't believe he's here with good intentions.

"Look, Peter, I don't know what else I can do to prove to you I'm in your side. I've been poked, prodded. Sand Demon's from my world. Let me teach you how to stop him." Jay pleads to Peter, but he doesn't buy it.

"Yeah, Sand Demon might be from your world, but I fought someone who could do the same thing. Sandman could do everything your Sand Demon can do, and I beat him several times." Peter replies since he knows not to trust people when his senses warn him to stay away.

"Zoom sent Rothstein here to kill you. He must have sent Sand Demon to do the same thing. Don't you get it? Anyone close to the Flash or Spider-Man, all of you, are in a lot of danger." Jay informs him and now Peter is getting annoyed.

"Okay, if you're this picture of hope and faith, why are my senses constantly warning me every time you enter the room?" Peter asks him. "Because every time I'm around you, my senses scream as loud that it actually gets me dizzy. I don't know what you're hiding, but I don't believe you're here with good intentions. Get Jay back to his cell, please." Peter asks as Caitlin and Jay leave to do just that.

Later Barry leaves to talk to Joe after they found the Sand Demon's Earth-1 doppelgänger and learned Jay was right about him being from his earth and May had to leave for her shift at the hospital.

"Yesterday's surprise broadcast from the Star City vigilante who is calling himself the Green Arrow has spawned a massive outcry of both support and dissenters." The news is saying, talking about Oliver.

"Catchy." Caitlin comments on the new name.

"I preferred just Arrow." Peter replies since Arrow was more simple than Green Arrow.

"I hate it when they put a color in their name." Cisco says as Barry comes back.

"Hey, the samples from the guy, they're definitely human, not sand." Peter says.

"It's not him, I get it." Barry replies.

"I hate to say it, but I think this Earth-2 theory is starting to make sense. I mean, could Jay seriously be lying about Sand Demon?" Cisco asks and Peter still doesn't trust Jay.

"Guys, were not just gonna jump on every crazy theory like it's the 100% truth, and I'm not gonna let some guy just walks in here and they sorta check out. My senses are still saying that he can't be trusted." Peter states since again, he has survived this long by trusting his senses.

"He was right about Zoom." Cisco replies to his friend.

"We don't even know anything about this Zoom. We don't even know if Jay is Zoom and is trying to gain our trusts. I know a guy who once spent years gaining my trust just to stab me in the back." Peter states remembering the Scarlet Spider-Man.

"Have you even discovered a breach yet?" Peter asks Stein as he's behind the computers.

"Not yet, but we know how to now." Stein promises them.

"Have you found one thing to suggest that Jay is even a speedster?" Peter asks Caitlin and she hasn't found anything. "I mean, we're scientists. We test, we prove, we report. That's how it always goes. Even my senses keep telling me he can't be trusted. And by now, after everything, I know my senses can't be wrong." Peter states and Caitlin asks to talk to him in private.

She takes him out onto the halls to talk alone without anyone eavesdropping. "What has happened recently? What happened to the Amazing, Spectacular Spider-Man? I mean, I haven't seen you like this since ever." Caitlin questions Peter since she didn't fall in love with this Peter Parker.

"A lot has changed, Cait. First, Wells turned out to be a enemy and because I didn't listen to my senses, everything happened. Even Conners, a friend, my mentor, he became a threat." Peter states since he can't just trust people because they seem nice.

"Why do you think your senses think Jay is a bad guy?" Caitlin wonders and thinks of something that could be it. "Is it because he reminds you of Harrison Wells?" She wonders since he and Wells spent a lot of time together before the accelerator explosion.

Peter just stares off for a minute and realizes that might be it. "We all trusted that man for years...and you know what happened? Eddie was killed. Ronnie was killed. And a handful of people I couldn't protect, they're dead because I didn't believe my sense when all they've ever done is keep me safe. And I don't want what happened to them to help to you, Cisco, everyone else I love." Peter explains his dilemma and Caitlin understands. She misses Ronnie, even Eddie at times, and she knows that he's been trying to stay himself, but loosing Wells took a toll on his trust.

"Peter, not everyone is like Harrison Wells. Besides, you've been able to defeat all of these enemies because you believed in others. Because you trust people. That's the Peter Parker I..." She wonders if after everything, she should tell him how she felt, but maybe now isn't the best time. "That is my friend." She goes with and Peter understands, maybe he should give Jay the benefit of the doubt for now and keep his eyes on him.

Barry comes back later and tells them Sand Demon took the transfer cop, Patty Spivot and now they need Jay to teach Barry to show him how to stop Sand Demon. "So You've finally come to your senses?" Jay asks them as they open his cell.

"Sand Demon kidnapped a police officer. I need you to help us save her before something happens." Barry explains to Jay and he looks towards Peter.

"This mean you finally trust me?" Jay wonders and Peter doesn't.

"I'm giving you the benefit of the doubt as of now. Don't break it." Peter warns him and they head to the cortex.

"We're looking for any place that promote humidity. Greenhouses, grow rooms, anything of the sort. His body will literally start to fall apart if he becomes dehydrated. Sand Demon always attacks on twitter fronts. He creates a diversion, then strikes when you're distracted. What we need to do is use your speed to get to him before the distraction can happen." Jay explains and they don't see how he can do that.

"How do I stop someone who can slip through my fingers?" Barry asks him. "The way I was never able to. With lightning." Jay states and now that's seriously confusing.

"I'm sorry, with lightning? I know electricity can turn sand into glass, but how's he gonna do that?" Peter asks Jay.

"Barry is gonna summon lightning from the energy he creates when he runs." Jay explains and that's gonna be interesting to see.

Jay brings Barry to the basement to test throwing lightning as Peter and Caitlin are helping locate Patty. "I've searched all the vacant buildings in Central City and none of them fit the description we need." Caitlin says to the others.

"Yeah, and I've looked at any draw upticks in the electric grid. Nothing happening." Peter states when Cisco excuses himself and that confuses them.

Cisco goes back to the lab and touches the sample of Sand Demon and starts getting another vibe and was able to get their location and see Sand Demon is creating a weapon.

In the basement, Barry has learned the "throw lightning" part down but his aiming is still off. "I've been doing this for an hour, it's not working." Barry stops and tells Jay.

"It's because you're trying to rush it. This is the one time you need to slow down. Let the energy pass over you, then direct it where you want it to go." Jay explains and Barry doubts himself and starts seeing too many comparisons between Jay and Thawne when Cisco comes in to tell them where they are.

"They're in the abandoned Woodrue grow house." Cisco informs them and explains that he might have a secret device.

"What if we give Slick a diversion?" Peter says and looks towards Jay.

"He knows you, right? You said you went up against him." Barry asks seeing Peter's idea.

"Yeah, But I don't have my speed." Jay says and they explain how Sand Demon doesn't know that.

"I have my suit, all except my helmet." Jay tells them and they remember the helmet that fell through the time portal last year. They reach the cortex and Caitlin hands him the helmet and they see him in his suit. And now Peter might believe him that he's a hero, and his senses are just being paranoid.

"Well, sure you want to do this, Flash?" Barry asks Jay.

"Yeah, let's see what you're made of, Flash." Jay states as the plan is Barry and Jay go in, distract Sand Demon while Peter gets Patty out of there.

At the greenhouse, Sand Demon activates the bomb underneath Patty as Barry speeds Jay in and Peter enters through the ceiling to stay hidden. "Is that you, Flash?" Sand Demon asks and turns to see Jay. "I came quite a distance." Jay states.

"I thought you were dead." Sand Demon replies seeing his Flash alive. "You were wrong. Like usual." Jay informed him.

"Now let her go." Jay tells Demon.

"Go ahead, you touch her, she goes boom. And I think even you aren't fast enough to save her." Demon states while walking closer to Jay and they start fighting and it didn't take Demon long to realize he didn't have his speed.

Peter leaps down while he's distracted and Barry comes speeding in to help Jay, while Peter webs Patty in the back and pulls her away as the bomb goes off, sending a soundwave across the room and disorienting the speedsters and Peter.

"I got her, she's okay." Peter tells them regarding Patty as she's unconscious.

"Must be my lucky day. Zoom sent me here to kill you. Now not only do I get to kill the Flash from two worlds before I go home...I get the opportunity to kill Spider-Man." Demon states happy since on his world, Spider-Man has been missing for a while since New York fell to the Symbiotes.

Sand Demon grabs Jay by the neck with his sand and Barry sees he has to use his lightning. He starts speeding around and Sand Demon drops Jay to focus on Barry.

Barry stops and tries as hard as he can to throw lightning and slams into Sand Demon as he falls and shatters like glass. "You get stranger and cooler all the time." Peter says as he picks the unconscious Patty up ready to get her back to safety.

While Peter was doing that, Barry and Jay returned to Star labs and Stein talks to Cisco regarding how he learned all of this impossible stuff and they learn he has powers, and their breach location system starts working.

"It appears that while we were successful in closing the singularity, there was a side effect. Using electrophotography, Cisco and I were able to search Central City for any signs of energy entering our earth from another dimension." Stein explains to the team and Cisco tells them it's not just one.

"There's at least 52 of them scattered throughout the city." Cisco states and now they see that Zoom could come through any one of them.

"So, 52 pockets of time and space folded into and upon itself in our city. Why am I surprised at this point?" Peter wonders since this is turning into a weekly thing.

"But the most significant breach of all appears to be this largest one. And it's here, inside Star labs. And just beyond that breach is entirely different..." Stein starts getting cut off and suddenly his head and hands burst into flames surprising everyone before he faints, but Peter was able to catch him before he could hit the ground.