- "Okay, so, Jay, how exactly do you know all of this?"
- "Where I came from, I was a speedster like you. They called me The Flash."
- —Barry Allen and Jay Garrick
|Jay Garrick, a mysterious man from Earth-2, appears at S.T.A.R. Labs with a dire warning about an evil speedster named Zoom, who is set on destroying The Flash. Barry and the team must decide if they can trust this stranger even as they face yet another powerful meta-human. Meanwhile, Joe must deal with a determined officer named Patty Spivot who wants to join his meta-human task force.|
- Grant Gustin as Barry Allen/The Flash
- Candice Patton as Iris West
- Danielle Panabaker as Dr. Caitlin Snow
- Carlos Valdes as Cisco Ramon
- Tom Cavanagh as Dr. Harrison "Harry" Wells
- Jesse L. Martin as Detective Joe West
Special guest star
- Teddy Sears as "Jay Garrick/The Flash"
- Kett Turton as Eddie Slick/Sand Demon and Eddie Slick
- Shantel VanSanten as Officer Patty Spivot
- Vanessa Williams as Francine West
- Ryan Handley as Zoom
- Tony Todd as Zoom (voice)
- Stephen Amell as Oliver Queen/Green Arrow (archive footage)
Beginning from the specific second the past episode finished, the group is dazed that Jay Garrick knows the entirety of their names, and acknowledge he has been keeping an eye on them. Jay clarifies that he is from a different universe, where he is known as The Flash.
In his own reality, Jay's variant of The Flash battles another Speedster, Zoom. Zoom has won, and is going to convey the murdering blow when the opposite finish of the peculiarity from Barry's reality opened over them. First Jay's winged head protector is sucked in, at that point Jay is too. He lost his speed, and has gone through the most recent a half year attempting to bits together what occurred. Barry is incredulous, and demands that they test Jay.
In another piece of Central City, a break opens. Zoom comes through it, carrying a man with him. Zoom tells the man that on the off chance that he needs to return home, first he needs to execute The Flash.
Caitlin looks at Jay, addressing him simultaneously about how he turned into the Flash. She is satisfied to learn he is additionally a researcher.
In the following room, Iris and Joe are confounded by the idea of equal universes. Stein clarifies the hypothesis of comparable yet various universes, naming their reality Earth-1 and Jay's Earth-2. Stein is additionally worried about a break existing between the universes.
Caitlin reports that she has no verification that Jay is a speedster. However, she utilized her clinical gear as an untruth identifier test, and he passed. Barry's concerned that Jay is a miscreant.
At the police headquarters, Joe overlooks a call and is promptly drawn closer by a female formally dressed official, Patty Spivot. She needs to join the metahuman team, despite the fact that every other person quit. Regardless of just being a cop for seven months, she has a great resume. Joe advises her no.
Barry secures Jay a cell. Jay says Barry will require his assistance to vanquish Zoom. They are hindered by a call from Cisco, there's a fire around. Barry hurries off.
The Flash extinguishes the fire and is going to leave when he is assaulted by a mass of sand. The sand assembles and transforms into the man Zoom brought through the penetrate before. The Flash attempts to battle him, however every time he conveys a blow, that piece of the man goes to sand and is safe. The Flash needs to flee.
Barry and Joe examine the area of the fire with other police and firemen. Barry can't discover anything to recognize this new metahuman, yet Patty appears, she's discovered something. She's likewise a serious devotee of Barry's and his criminological reports. She's gathered some sand for Barry. Patty plainly trusts this has dazzled Joe, however he despite everything will not let her on the team.
Jay runs on the S.T.A.R. Labs treadmill, at an extremely typical speed. Caitlin is plainly pulled in to Jay. Cisco begins to look at the sand Barry brought, and Jay clarifies that it is human cells. He calls the metahuman Sand Demon. He offers to help stop him, yet Barry cannot and takes Jay back to his cell.
Cisco and Stein have set up a little science lab in another room. Stein figures they can scan for the penetrate among universes (and along these lines demonstrate Jay's story) by searching for intriguing issue. Cisco realizes how to take photos of the extraordinary issue and discloses to Stein where to discover a bit of hardware. After Stein leaves, Cisco begins to analyze the sand however out of nowhere winds up viewing the prior battle among Barry and Sand Demon. Cisco's plainly terrified of these dreams.
Joe sits in his vehicle, marking out Eddie Slick, otherwise known as Sand Demon. He calls Barry to clarify that he's discovered the pyro criminal. Barry asks where they are, yet Slick makes Joe, who is compelled to pursue him. Patty additionally found Slick, and gets him for Joe. She asks again to be on the team.
At the police headquarters, Eddie Slick has a background marked by illegal conflagration, yet he denies setting this fire. Joe undermines him, bringing up that Iron Heights is currently prepared to hold metahumans. He asks where Slick was the day the atom smasher detonated.
Viewing the cross examination, Patty and Barry bond over Monty Python and the Holy Grail. Barry offers to prescribe Patty to Joe for the team.
Smooth's vindication is acceptable, he was not in Central City when the quickening agent detonated. Joe recommends that Jay's clarification of Slick being from Earth-2 may bode well.
At S.T.A.R. Labs, just Barry still doesn't confide in Jay. Iris requests to address Barry alone. Iris reveals to Barry that she doesn't remember him. He's another person now, with significant trust issues. Barry concedes that Jay helps him to remember Wells, who he trusted. Iris calls attention to that they beat Wells in light of the fact that the group confided in one another. He needs to have confidence in the group.
At the Police Station, Joe and Patty discharge Slick. Joe inquires as to why Patty needs to be on the team so severely. They think they see Slick returning, however it is Sand Demon, who thumps Joe out. Patty attempts to shoot him, however the slugs go through the sand. He gets her.
Barry goes to Jay and discloses to him that Sand Demon seized a cop. He needs Jay's assistance. Jay discloses to the group that Sand Demon will be somewhere wet and muggy. On the off chance that Barry can hit him with lightning, it will turn the sand to glass. Jay realizes how to shoot the lightning, he will instruct Barry.
In the corridor, Barry solaces Joe, who censures himself for Patty's kidnapping.
Sand Demon has Patty attached to a seat in a clammy relinquished structure. She trusts The Flash will stop him. That is the thing that Sand Demon is seeking after, he is making a concussive bomb. Patty attempts to occupy and outrage him by asserting he's not extraordinary, yet it doesn't work.
Indeed, even with Jay's data, Caitlin, Cisco, and Stein can't make sense of where Sand Demon is. Cisco pardons himself and goes to his and Stein's lab. He contacts the sand, planning to see where Sand Demon is. It works, and Cisco ends up viewing the previous trade among Patty and Sand Demon. He sees the name of the area, and the bomb too.
Stein discovers Cisco and is interested. Cisco claims he suspects and rushes to tell Barry.
Jay has instructed Barry to toss lightning, yet Barry's point is awful. Jay mentors him, revealing to him that for once, he needs to back off.
Cisco and Stein enter and Cisco gives the area. He additionally makes reference to the bomb, imagining it is a hypothesis. Since Jay has battled the Sand Demon previously, they need him to be a preoccupation, Sand Demon won't realize he lost his speed. Jay concurs, saying he has his Flash ensemble, just not his protective cap.
Cisco presents to Jay the winged protective cap they found the day the peculiarity opened, and Jay puts it on. He clarifies his dad wore the cap in the War of the Americas.
The bomb is finished, and under Patty's seat. Sand Demon hears a speedster run in, and afterward observes Jay, dressed as the Earth-2 Flash before him. He thought Jay was dead. Sand Demon and Jay battle, and it turns out to be clear rapidly that Jay lost his speed.
Barry exploits Sand Demon's interruption to spare Patty, however the blast wrecks them. Sand Demon, excited to get the chance to murder the two Flashes, gets Jay by the throat. The Flash rates in a hover around them, and heaves the lightning directly at Sand Demon, who goes to glass and breaks on the ground.
The Flash keeps an eye on Jay, who is alright. Patty requires The Flash, and the two of them answer and race to her.
Back at S.T.A.R. Labs, Caitlin wraps Jay's injuries. He concedes that losing his speed is more earnestly than he suspected. Caitlin converses with him about misfortune getting simpler. They simply need to locate another approach to live. She considers him a legend.
Barry comes to apologize to Jay and say thanks to him. He gets some information about Zoom. Jay discloses that Zoom needs to be the main speedster. On any world.
At the police headquarters, Joe discloses to Patty he gazed her upward. He gets some information about her association with Mark Mardon. Patty says that a couple of months before the atom smasher detonated, the Mardon siblings ransacked a bank. Imprint slaughtered her dad for two or three hundred dollars. Killers got super powers, and she needs to battle against that. Joe discloses to her she begins the team Monday.
A lady strolls off the lift and approaches Joe. He needs to know why she is there. She says it is on the grounds that he wouldn't answer her calls. She needs to know how Joe is. What's more, their little girl.
Stein stands up to Cisco in their lab. He doesn't have faith in Cisco's hunches. Cisco admits to Stein that since Wells killed him in the other timetable, he gets vibes and sees things that as of late occurred. Stein needs to examine this force, yet Cisco simply needs it to stop. Wells gave him this, and that alarms Cisco. Stein makes a deal to avoid telling anybody.
Cisco and Stein present their information on not a couple, however 52 breaks between universes to the group. With the most noteworthy penetrate at S.T.A.R. Labs. Stein out of nowhere falls.
At another, dynamic rendition of S.T.A.R. Labs, a gathering of kids are lead around by a local escort, who clarifies about the Lab's noteworthy record. Abruptly, the guide gets energized and advises the children that they get the opportunity to meet the friend in need of Central City. Remaining before them is Harrison Wells, who says "Hello kids."
- The episode is named after the iconic story of the same name published in September 1961, featuring the first crossover between the Barry Allen and Jay Garrick iterations of The Flash.
- Joe contacts his colleague, "Jimmy", to corroborate Eddie Slick's alibi that he was in Blackgate Penitentiary at the time of the particle accelerator explosion. Given that Blackgate is traditionally located in Gotham City, one would assume "Jimmy" is a reference to Commissioner James Gordon of the Batman mythos.
- Blackgate Penitentiary in Gotham City would appear 4 years later in .
- Stein suggests that on Earth-2, Joe West's doppelgänger might be a Nobel Prize-winning physicist like his comic counterpart, Ira West, Iris' adoptive father.
- It was later revealed in "" that Earth-2 Joe West was in fact a musician.
- Cisco says there are 52 dimensional breaches, likely a reference to the 52 parallel Earths in DC Comics, which are part of the New 52 continuity.
- A fire truck appears in this episode with the number 52 on the side, another reference to the New 52.
- Cisco and Caitlin watch the TV where Oliver Queen broadcasts his new identity as the Green Arrow to Star City, which took place at the end of "".
- The Woodrue greenhouse facility where Patty is held captive could be a reference to Dr. Jason Woodrue, a botanist in the DC comics who is responsible for the creation of Poison Ivy and later becomes the supervillain Floronic Man.
- As a detective, Joe would not have the authority to promote Patty, a fellow police officer. This must be accomplished by a chief or captain and possibly not without achievement of a specific goal by the officer in question, depending on the police force and its rules.
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