|"Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."|
|With Oliver and Barry still stuck in the other's bodies, the two get a lead on John Deegan and head to Gotham City with Supergirl to figure out why their reality has changed. While there, they meet the mysterious Kate Kane who provides them with information that leads the group to Arkham Asylum.|
Grant Gustin does the conventional starting monolog as Oliver.
During an Argus operation, Diggle drives his group while Curtis watches from a van. The group is assaulted by a vigorously defensively covered Joe Wilson, who is going to execute Dig when Supergirl, The Flash, and The Green Arrow appear and stop him.
Back at Argus, they clarify their body trading issue to Curtis and Diggle. At the point when Felicity appears at help, it turns out to be certain that Oliver didn't inform her concerning the trade and she trusts Barry is Oliver.
As the three legends prepare to make a beeline for Gotham, Oliver propose Barry stay behind, since Oliver Queen's acclaim will make things troublesome. Barry counters by reminding Ollie to keep the cover on as The Flash. They likewise contend about Batman, who Ollie demands is a fantasy.
Kara at last settles things by getting Barry and traveling to Gotham. They land on a housetop and are before long joined by Oliver, who keeps on battling with his speedster capacities. They examine how to discover the individuals from Cisco's vibe, and Oliver specifies knowing a neighborhood correspondent. He doesn't know she will help however, as he can't recall whether he laid down with her. They discover The Bat Signal on the rooftop, however Ollie keeps on considering Batman a legend. Batwoman watches them from the top of Wayne Enterprises.
In their non military personnel garments, the legends stroll towards the radio broadcast where Ollie's journalist contact works. They see a couple shopping with an outfitted watch and examine how wrongdoing ridden Gotham City is. As though on sign, a group of hooligans stroll up and endeavor to mug them at gunpoint. Ollie attempts to talk them down yet is rapidly stuck between a rock and a hard place and Barry battles, taking it excessively far. The cops show up, perceive Barry as Oliver, and capture everybody.
Felicity and Curtis work at Argus, attempting to discover an example with the red lightning storms they have taken note. They understand it is reliable with a break and need Cisco. Fortunately, Cisco understood something very similar and shows up at Argus with Caitlin right away. Caitlin incidentally uncovers to Felicity that Ollie and Barry have exchanged bodies.
In prison, Kara is tired of Barry and Ollie quibbling and gets them both out for how the took care of the robbing, calling attention to she could have gotten them away so quick they wouldn't have been seen. Ollie surrenders that she ought to be in control next time. Their bail is posted and the three are discharged.
Outside a man meets them. They understand he works for the individual who rescued them and when he shows then a firearm, they go with him.
He drops them off at Bruce Wayne's home, which was pleasant once, yet not any longer. Inside they are welcomed by an inked lady who perceives the truth about Barry and Ollie. She is Kate Kane and she needs them to leave her city as quickly as time permits.
Caitlin and Cisco are distraught at Diggle and Curtis for concealing reality from Felicity. Felicity is generally disturbed that Iris perceived her better half while Felicity didn't. Yet, she says they have to concentrate on the lightning.
On the rooftop, Kate converses with Kara and Ollie. Kara inquires as to why Bruce Wayne and Batman both disappeared simultaneously – three years prior. Kate says Bruce couldn't live with what Gotham became after Batman left.
Barry appears, Ollie's contact won't help. Kate gives them the wifi secret key and heads inside to work while Ollie uncovers he took police information.
Caitlin converses with Felicity, calling attention to that Iris has much more involvement in exchange real factors and that would have made her increasingly open to the body trade. Felicity doesn't think Ollie regards her, however Caitlin supports her. Felicity in the interim has plans for a quantum motion grapple to help open the penetrate.
Oliver look through facial acknowledgment and gets some answers concerning John Deegan. He probed his patients, however was cleared because of details. He can't locate Deegan's present location or work. Kara chooses to look through the city.
Inside the structure, Kara sees Kate and connects with her. Kate clarifies that she is Bruce's cousin. Kara says her own cousin is frenimies with Kate's. They talk and Kate teases a bit. Kate knows John Deegan and says he works at Arkham Asylum.
Kate makes a beeline for the Bat Cave, where she keeps the Batwoman suit and hairpiece.
Curtis, Diggle, Felicity, and Caitlin set up Felicity's quantum transition stay while Cisco handles the PCs inside. There's different floods, and a break nearly opens, with the John Wesley Shipp Flash peering through, Caitlin calls him Jay, however he overlooks her and instructs them to get the book before the penetrate closes once more.
Outside of Arkham, Kara, Oliver, and Barry talk about how to break in. Cisco penetrates through with Diggle to pass the message.
Kara pushes Caitlin in a wheelchair and tells the manager that she is conveying another patient from the medical clinic, utilizing Killer Frost's forces to reinforce the untruth. In the interim, Ollie utilizes Barry's CCPD certifications and Diggle utilizes his Argus ones to menace their way into an investigation. They stroll a few doors down, where a few natural names are on the patient entryways, before they discover Deegan's lab.
Deegan sees the truth about Oliver, and presses a catch which triggers an alert and discharges all the patients so he can get away.
Diggle, The Flash, Supergirl, Killer Frost, and The Green Arrow help recover the patients. At the point when a couple nearly escape, Batwoman appears and stops them.
In the interim, Killer Frost is going head to head with Nora Fries, who has a portion of her significant other's chilly innovation. Executioner Frist calls for help and both The Green Arrow and The Flash rush to help her.
Deegan snatches the book from a concealing spot inside the dividers, yet is found by Supergirl who takes the book.
The Green Arrow and The Flash appear and discover Killer Frost took out. The Flash throws a lightning left hook, however Oliver despite everything doesn't have an idea about these forces and he thumps more than a few vials marked 'Crane' which spill and discharge a gas into the air.
Before Barry, Malcolm Merlyn shows up and addresses him as Oliver. Before Ollie, the Reverse Flash (as Harrison Wells) shows up and insults him like Barry. They battle each other's chief enemy yet when Caitlin comes to as herself, she understands they are battling one another.
Barry and Oliver keep on battling as they daydream themselves being provoked. Batwoman shows up and stops them, perceiving the vials and disclosing they were presented to a genuine drug.
Batwoman kicks them all out of her city. Supergirl remains behind and uncovers she is Kara, and because of her x-beam vision she knows Kate is Batwoman. They share a snapshot of solidarity.
The book is presently at Argus, and Felicity is anxious to interpret the cryptographs inside. Barry and Oliver talk about their pipedreams and recognizes each other's weights. Barry urges Ollie not to hold back to chat with Felicity.
Ollie sits with Felicity and reveals to her they will be alright. Ongoing occasions have given him that they may change as individuals, yet he will consistently adore her regardless and they make up.
At last, the other Flash can break into Argus. He isn't Jay Garrick however. He is Barry Allen, from Earth-90 which was obliterated by The Monitor – the other man in Cisco's vibe. He utilizes The Book of Destiny all through the multiverse.
The Monitor is in the road. Supergirl, The Green Arrow, and the two Flashes go up against him. The O.G. Streak heads towards The Monitor who causes him to evaporate. The Monitor says he is attempting to spare the multiverse from an emergency. He brings the book from Argus and vanishes.
Deegan is crying when The Monito shows up before him and hands the book back finished, advising Deegan to think greater and improve.
Out of nowhere, Barry and Oliver acknowledge they are dressed indistinguishably, and a paper title text says they are needed lawbreakers known as The Trigger Twins. Kara is no place to be seen and neither of them is a speedster. A cop vehicle pulls up and three cops rise. Joe Wilson, Malcolm Merlyn, and Ricardo Diaz. Diaz begins to capture Oliver, who retaliates and he and Barry run. Just to be halted by a variant of Superman who is dressed all in dark.
- Stephen Amell as Oliver Queen/The Flash
- David Ramsey as John Diggle
- Emily Bett Rickards as Felicity Smoak
- Echo Kellum as Curtis Holt
- Rick Gonzalez (credit only)
- Juliana Harkavy (credit only)
- Colton Haynes (credit only)
- Kirk Acevedo as Ricardo Diaz
- Sea Shimooka (credit only)
- Katie Cassidy (credit only)
Special guest star
- Grant Gustin as Barry Allen/Green Arrow
- Danielle Panabaker as Caitlin Snow/Killer Frost
- Carlos Valdes as Cisco Ramon
- Tyler Hoechlin as Superman
- Melissa Benoist as Kara Danvers/Supergirl
- John Barrowman as Malcolm Merlyn/Dark Archer
- Tom Cavanagh as Eobard Thawne/Reverse-Flash
- Jeremy Davies as John Deegan
- Ruby Rose as Kate Kane/Batwoman
- LaMonica Garrett as Mar Novu/The Monitor
- Bob Frazer as Roger Hayden/Psycho Pirate
- Cassandra Jean Amell as Nora Fries
- Liam Hall as Joe Wilson/Kane Wolfman
- John Wesley Shipp as The Flash
- The episode was previously titled "Hour Two".
- Nora Fries is played by Stephen Amell's wife Cassandra Jean.
- Some of the locations in Chicago that were filmed in this episode were the same locations used in The Dark Knight trilogy to replicate Gotham City.
- This episode marks the very first time in the Arrowverse where Batman is mentioned by name on-screen.
- Bruce Wayne, who was mentioned before in "", is also mentioned several times in the episode.
- This episode features many references to Batman:
- The inmate rooms inside of Arkham Asylum contained nods to several Batman villains on each door including: , , and .
- Despite the references to the Batman villains, there was one name on an inmate's room that instead referenced writer and former showrunner Marc Guggenheim.
- The WiFi password Kate gave to Oliver, Barry and Kara is "Alfred", which is a reference to Batman's butler, .
- Digger Harkness' boomerang, 's mask from , 's sunglasses, the 's cane, the , and other items can be seen inside of Deegan's lab.
- Barry asks if a ride in the is out of the question, referencing Batman's vehicle from the comics.
- Kara finds a William Shakespeare bust in a box which is a reference to the 1960s TV series where it has a button to the entrance of the Batcave.
- When Oliver mis-aims a lightning bolt, the gas released falls out of a box labelled "Crane, J". This is a reference to , one of Batman's greatest villains.
- Nora Fries takes a freeze ray from a glass case that's labeled "Fries, V". This is a reference to her husband
, one of Batman's greatest villains.
- Victor Fries was mentioned before in "".
- A Gotham police officer mentions Nolan and Burton streets. This is an homage to , who directed the three films in the , and , who directed and .
- When Supergirl says goodbye to Batwoman, she says that they both would have been a good duo, to which Batwoman replies as the "World's Finest". This is a reference to a crossover in the comics between Batman and Superman named where they both team up.
- Kate says Wayne's R&D (Research and Development) guy still works at Wayne Enterprises, a reference to Lucius Fox.
- Written next to the Riddler's cell (aka E. Nigma) in Arkham Asylum, is the riddle "What's black and blue and red all over?" This is a play on the classic 'newspaper riddle' used taunt to a bloodied, costumed Batman; most recently used in the comic series Gotham City Sirens.
- The inmate rooms inside of Arkham Asylum contained nods to several Batman villains on each door including: , , and .
- The Earth-90 Barry points out that the John Diggle of Earth-1 doesn't wear a ring like his Earth-90 counterpart. This is a reference to , who in the comics is one of the characters who wear the and becomes .
- Barry narrates the opening introduction (using the name Oliver Queen) due to the altered reality where he's Oliver Queen/Green Arrow. This monologue would later be used as the mid-Season 7 intro.
- At the end of the episode, the Monitor reveals that he is preparing them for a "Crisis". This ties in with the red skies emerging in the first two parts of the crossover. Both are a reference to the Crisis story arc, which includes Crisis on Infinite Earths, Infinite Crisis, and Final Crisis.
- The scene where Earth-90's Flash was trying to tell the team about the Book of Destiny while stuck in the portal may have been a nod to when future Barry Allen in that film was trying to warn Bruce Wayne in the present.
- When Barry, Kara, and Oliver go to A.R.G.U.S. and tell John and Curtis that Barry and Oliver have swapped lives, John says "An immortal Egyptian, aliens, parallel Earth Nazis; I have no idea why I'm not even surprised at this point." These are references to three previous crossover events; , , and , respectively.
- This is the second ninth episode of an season to feature Grant Gustin (Barry Allen) since "".
- When the Flash of Earth-90 materializes on Earth-1, the theme from the 1990 Flash TV series can be heard.
- The writing seen in the Book of Destiny matches Barry Allen's wall scribbles in "", when he returns from the speed force, apparently insane, as well as the writing in Nora Allen's journal and some of the writing Clifford DeVoe/The Thinker used.
- Between cuts while the hero trio were on the roof in Gotham running facial recognition for John Deegan Kara is seen flapping open her coat and looking down while in the next cut she is looking straight and has her coat closed. Barry is also seen looking around but is looking very straight after the cut.
- Even in the chaotic history of Arkham Asylum, it would never make sense to place an unlocked lab/weapon storage facility in the hallway amidst prisoner cells.
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