Arrowverse Wiki
Arrowverse Wiki
"An immortal Egyptian; aliens; parallel-Earth Nazis; I have no idea why I'm not even surprised at this point."
John Diggle[src]

A list of crossover episodes which involve characters from multiple shows within the Arrowverse. They are arranged chronologically, grouped by season.

Crossover events

Flash vs. Arrow

Main article: Flash vs. Arrow (crossover event)

The first annual crossover event in the Arrowverse aired during the 2014–2015 season. Team Flash and Team Arrow help each other stop villains in their respective cities on The Flash​​ and Arrow​​.

Heroes Join Forces

Main article: Heroes Join Forces

The second annual crossover event in the Arrowverse aired during the 2015–2016 season. This crossover event served as a set-up for DC's Legends of Tomorrow​​​​. Team Flash and Team Arrow join forces in order to stop Vandal Savage.


Main article: Invasion!

The third annual crossover event in the Arrowverse aired during the 2016–2017 season. An alien race called the Dominators invade Earth and the Earth-1 heroes call for help from Supergirl.

Crisis on Earth-X

Main article: Crisis on Earth-X

The fourth annual crossover event in the Arrowverse aired during the 2017–2018 season. This crossover event serves as a set-up for the web miniseries Freedom Fighters: The Ray​​. During the West-Allen wedding, Nazis from Earth-X stir up trouble.


Main article: Elseworlds

The fifth annual crossover event in the Arrowverse aired during the 2018–2019 season. This crossover event follows "Who Are You?" of the Batwoman​​ TV series[1], while also begins to set up the plot of Crisis on Infinite Earths.

Crisis on Infinite Earths

Main article: Crisis on Infinite Earths

The sixth annual crossover event in the Arrowverse aired during the 2019–2020 season. Heroes from the Arrowverse series and beyond must stop the Anti-Monitor from ending all of reality.


Main article: Armageddon

The seventh annual crossover event in the Arrowverse aired during the 2021–2022 season. Barry Allen seeks help from various heroes on Earth in the fight against Despero.

Crossover episodes

2014–2015 season

Episode from # Episode name Show(s) crossing over
The Flash​​ S1 01. "Pilot" Arrow​​ S3
Oliver Queen takes Barry Allen up on his offer. Barry then visits Starling City to reveal his newfound powers and ask what he should do.
Arrow​​ S3 01. "The Calm" The Flash​​ S1
Barry Allen calls Oliver Queen, saying he needs some advice.
The Flash​​ S1 04. "Going Rogue" Arrow​​ S3
Felicity Smoak visits Barry Allen in Central City to see his superpowers for herself, meets and helps Team Flash, and assists them in defeating Leonard Snart, aka Captain Cold.
07. "Power Outage" Arrow​​ S3
William Tockman, the Clock King, escapes custody in the CCPD and takes several people hostage, including Iris and Joe West.
08. "Flash vs. Arrow" Arrow​​ S3
Oliver Queen, Felicity Smoak and John Diggle head to Central City looking for the boomerang killer, and help Team Flash fight Roy Bivolo, a meta-human who can cause uncontrollable rage in others. Oliver and Barry's differing methods cause tension between the two, and they are forced to fight when Bivolo uses his powers on Barry.
Arrow​​ S3 08. "The Brave and the Bold" The Flash​​ S1
Barry Allen, Cisco Ramon and Caitlin Snow visit Starling City to help Team Arrow defeat assassin Digger Harkness. While there, Cisco meets Detective Quentin Lance, and Barry and Oliver resolve their previous differences.
Vixen​​ S1 01.-06. "Episode 1" • "Episode 3" • "Episode 4" • "Episode 6" Arrow​​ S3The Flash​​ S1
Cisco Ramon uses Felicity Smoak's facial recognition software to look for meta-humans outside Central City and finds evidence of Mari McCabe using her animal powers against thugs in Detroit. He nicknames her "Vixen" and gives her whereabouts to Barry Allen, who decides to take backup; he and the Arrow show up at Mari's apartment. When Barry uses her name, she panics and runs away. Flash and the Arrow chase Mari, who uses various animal powers to evade them, including speed, wall-climbing, camouflage, and flight. They eventually talk; Mari explains she was not in Central City for the particle accelerator explosion, a fact confirmed by Felicity Smoak, and refuses their offer of help, threatening them with violence if they return. Flash and the Arrow visit Mari again, offering to help train her if she intends to become a vigilante; she says she is but wants to work things out on her own. She asks about getting a codename and Barry says they call her "Vixen"; he lets slip Cisco's name, giving her a clue as to his identity. (Takes place around the same time as "The Offer"​.)
The Flash​​ S1 18. "All Star Team Up" Arrow​​ S3
Ray Palmer and Felicity Smoak visit S.T.A.R. Labs to get help perfecting Ray's A.T.O.M. Exosuit, and help Team Flash defeat a swarm of robotic bees.
Arrow​​ S3 19. "Broken Arrow" The Flash​​ S1
Team Arrow and Ray Palmer defeat the meta-human Jake Simmons, aka "Deathbolt", who has come to Starling City thinking no-one can stop him with the Arrow gone. Simmons is imprisoned in the Pipeline, but Cisco and Ray realize he was in Opal City during the dark matter wave, making the source of his abilities a mystery.
The Flash​​ S1 19. "Who is Harrison Wells?" Arrow​​ S3
Cisco Ramon and Joe West head to Starling City to investigate the real identity of Harrison Wells with the help of Quentin Lance. Cisco also meets Laurel Lance and upgrades her sonic device, renaming it the "Canary Cry".
22. "Rogue Air" Arrow​​ S3
Barry Allen decides to move the meta-humans from the Pipeline at S.T.A.R. Labs to the A.R.G.U.S. prison on Lian Yu, to protect them from the plans of the Reverse Flash. He enlists the help of Leonard Snart, but Snart double-crosses the Flash and frees most of the villains. Barry then fights the Reverse Flash, defeating him with the help of Oliver Queen and Firestorm.
Arrow​​ S3 23. "My Name Is Oliver Queen" The Flash​​ S1
Barry Allen briefly visits Nanda Parbat to save the members of Team Arrow, convincing them Oliver still needs their help.

2015–2016 season

Episode from # Episode name Show(s) crossing over
Arrow​​ S4 01. "Green Arrow" The Flash​​ S2
In a flash-forward to six months in the future, Barry Allen visits Oliver Queen in a graveyard, apologizing for missing a funeral. Oliver vows to kill "him", and asks Barry to leave before weeping over the grave.
05. "Haunted" Constantine (set after its S1)
In a flashback to his time infiltrating Baron Reiter's operation on Lian Yu, Oliver Queen meets John Constantine, saving his life while he is retrieving the Orb of Horus. In the present, Oliver calls in this favour from John to restore the soul of Sara Lance, who has been resurrected from the dead by the Lazarus Pit.
Vixen​​ S2 01.-06. "Episode 1" • "Episode 4" • "Episode 5" • "Episode 6" Arrow​​ S4The Flash​​ S2
After Mari confronted Dr. Adam Macalester about his role in Kuasa's plot to steal her totem, Cisco contacts her to assist the Flash and Firestorm to stop Mark Mardon from causing havoc at Monument Point. After being placed in a coma by Mardon, Mari awakens with Chuck at her side. Soon she discovers that another totem from Zambesi Village was stolen. Mari discovers that Benatu Eshu is responsible for the heist and he uses the totem's pyrokinetic abilities against her. Mari seeks out Kuasa and discovers that Eshu was responsible for the massacre of most of the Zambesi in search of the magic totems. With the help of Felicity, the sisters reluctantly work together and they find the Zambesei water totem. After Kuasa's attempt at betrayal is thwarted by Mari, the Atom and Black Canary, they together battle Eshu. Mari defeats (and possibly unintentionally drowns) Eshu, at the cost of Kuasa's life. After the fire totem is destroyed, Vixen meets up with Flash, Green Arrow, Black Canary, and Atom at Coast City, feeling that in Detroit or out, it is her responsibility to protect others.
The Flash​​ S2 08. "Legends of Today" Arrow​​ S4
When Vandal Savage comes to Central City looking for Kendra Saunders, Team Flash ask Team Arrow to help keep her safe, but Carter Hall shows up claiming he and Kendra are reincarnated lovers. Savage follows them, and they learn from Malcolm Merlyn that Savage is an immortal looking for the Staff of Horus, and will stop at nothing until he finds it and kills both Carter and Kendra.
Arrow​​ S4 08. "Legends of Yesterday" The Flash​​ S2
Team Arrow and Team Flash work together to save Kendra Saunders and Carter Hall from Vandal Savage, who is willing to destroy both Central and Star Cities in his quest to kill them. They enlist the help of Malcolm Merlyn, who secretly recovers Savage's remains after he is turned to ash in the final conflict.
DC's Legends of Tomorrow​​​​ S1 01. "Pilot, Part 1" Arrow​​ S4
Approached by Rip Hunter to be part of his time-travelling team, Ray Palmer seeks Oliver Queen's advice, and decides to join. Sara Lance, given the same offer, spars with her sister Laurel, who encourages her to go and be a hero. She gives Sara a new codename, "White Canary", and a new suit to go with it that doesn't include a mask.
Arrow​​ S4 15. "Taken" Vixen​​ (set after its S2)
Mari McCabe visits Star City, using her totem to help Team Arrow find and destroy the source of Damien Darhk's power.
The Flash​​ S2 15. "King Shark" Arrow​​ S4
John and Lyla Michaels visit Central City and help Barry defeat King Shark.
DC's Legends of Tomorrow​​ S1 6. "Star City 2046" Arrow​​ S4
When the team arrives in 2046, they meet Connor Hawke and an old Oliver Queen, and they team up to take down Grant Wilson.
Supergirl​​ S1 18. "Worlds Finest" The Flash​​ S2 (set during "Versus Zoom")
While testing the Tachyon prototype to increase his speed, Barry Allen accidentally travels to Earth-38's National City and meets Kara Danvers, helping her to defeat the Silver Banshee and Livewire before she helps him return home split seconds after he left.
Arrow​​ S4 17. "Beacon of Hope" The Flash​​ S2
Brie Larvan escapes from jail and heads to Star City, looking to steal the Palmer Technologies bio-chip embedded in Felicity's spine.
DC's Legends of Tomorrow​​ S1 9. "Left Behind" Arrow​​ S4
When Ray, Kendra and Sara are stuck in 1958, Sara joins the League of Assassins and meets Ra's al Ghul.
Arrow​​ S4 19. "Canary Cry" The Flash​​ S2
Barry visits Oliver at Laurel's grave, apologizing for missing her funeral due to Zoom. Oliver vows to kill Damien Darhk in revenge and asks Barry to leave before weeping over Laurel's grave. (This is the flash forward scene from "Green Arrow"​.)
DC's Legends of Tomorrow​​ S1 16. "Legendary" Arrow​​ S4
Rip brings the team back to Central City in 2016 - but five months after they left. Sara returns to Star City, where her father tells her of Laurel's death. Rip tells Sara they can't go back in time to save her. Sara and Quentin visit Laurel's Grave where Sara reveals it was Laurel that convinced her to join Rip's team, and she will continue for her sister.

2016–2017 season

Episode from # Episode name Show(s) crossing over
The Flash​​ S3 02. "Paradox" Arrow​​ S5
Barry goes to Star City to talk with Felicity about the changes that he has noticed as a result of Flashpoint. Team Arrow are unaffected, except that John Diggle and Lyla Michaels have a son - John Junior - instead of daughter Sara.
DC's Legends of Tomorrow​​ S2 01. "Out of Time" Arrow​​ S5
Nate Heywood notices changes to the timeline, and seeks out Oliver Queen, whom he has worked out is the Green Arrow, to help him find the Legends. They find Mick Rory in stasis on the Waverider under the sea. When they wake him, Mick tells them the Legends were scattered after attempting to stop Damien Darhk from blowing up New York with the Nazis in 1942. Oliver convinces Nate to join Mick in finding the others, while Darhk is revealed to have teamed up with Eobard Thawne.
Supergirl​​ S2 08. "Medusa" The Flash​​ S3
Barry Allen and Cisco Ramon travel to Earth-38 in need of Kara's help. They come to her apartment on her earth, where Barry introduces Kara to Cisco and asks her if she recalls a favor she owes.
The Flash​​ S3 08. "Invasion!" Supergirl​​ S2Arrow​​ S5DC's Legends of Tomorrow​​ S2
Barry speeds over to Star City to ask for Oliver, Felicity and Diggle's help to go after aliens known as the Dominators according to Lyla Michaels. Thea Queen wants to come out of retirement as Speedy and help too, Barry also decides to call on the Legends for their assistance and he and Cisco travel to Earth 38 for Supergirl's help too seeing as she's an alien which may help, Barry introduces her to the others especially Oliver. Ray shows Cisco his new suit then tells Barry that Snart died a hero. Felicity talks to Cisco over his anger for Barry while Martin and Jax show him the message, along with Oliver, they all discover that it's Barry telling Rip Hunter that he created Flashpoint, Caitlin takes Martin back to his home where he finds that he has a daughter while everyone trains against Supergirl whose too strong for them all, Cisco finds the message and wants Barry to tell everyone about Flashpoint, Barry tells the others especially that Diggle had a daughter, but now has a son. this creates a rift in the team, with Sara reminding Barry that she always wants to save Laurel but she knows she can't due to the implications on her friends. Ray calls Barry's Flashpoint Timeline a Time Aberration. Barry sits out of the mission with Oliver who backs him up while Kara leads the team but the mission becomes a trap and they get brainwashed and Barry and Oliver try to stop them, Wally West helps too before Supergirl hurts him. The Flash and Green Arrow are able to save their friends before some of them get taken away.
Arrow​​ S5 08. "Invasion!" Supergirl​​ S2The Flash​​ S3DC's Legends of Tomorrow​​ S2
Oliver, Diggle, Thea, Sara and Ray got taken to the Dominators spaceship where they are all put to sleep under a hallucination of what would happen if Oliver, his father and Sara never got on the Queen's Gambit. They eventually discover its a dream world and battle Malcolm Merlyn, Deathstroke and Damien Darhk to escape then they wake up and battle Dominators and try to get away. Meanwhile, Felicity brings Cisco to Star City where they try to find them, he meets Curtis Holt, Rory Regan and Rene Ramirez who despises Metahumans and Aliens. she asks for The Flash and Supergirl's help when they discover Dominator technology fell into the wrong hands. They take on a villain whom they nickname Cyberwoman before they find their friends and contact Nate aboard the Waverider to save them as they find out more on the plan.
DC's Legends of Tomorrow​​ S2 07. "Invasion!" Supergirl​​ S2The Flash​​ S3Arrow​​ S5
Everyone, except for Thea, regroups in Central City. Nate joins them and reveals that he found footage from the first Dominators Invasion in 1951 and the team suggest they capture one of the Dominators to get information on their plan seeing as they took some of them first. Cisco and Felicity want to time travel in the Waverider, Nate takes Amaya Jiwe and Mick, Oliver tells Kara to sit out of the mission as he feels some normality needs to be restored. Felicity gets sick from the effects of Time Travel but she and Cisco remain on the Waverider where Felicity talks to Cisco again as she can tell that Cisco wanted to get away from Barry. Mick, Amaya and Nate go to find the Dominators. Nate tries out his new Steel Suit that Ray built him. The three Legends get captured while trying to kidnap a Dominator, they get taken by Agent Smith who in the present day tries to go after Barry, Oliver, Ray and Sara, but they overpower his agents and both teams in the past and present discover that the Dominators live in fear of Metahumans due to the Justice Society of America in the past but in the present when Barry created Flashpoint as it broke a peace between them and Earth so the Dominators want Barry to surrender himself so they live in peace and they created a Meta Bomb to kill all of the Metahumans. Felicity and Cisco save their friends but when they return to 2016 Central City, Cisco discovers that he changed the timeline, This prompts him to make up and forgive Barry for creating Flashpoint resulting in Dante's death. The team try to persuade Barry not to surrender himself to the Dominators. They battle the Dominators. Sara uses the Waverider 's beam to lift the Meta Bomb away so Firestorm can transmutate it where he succeeds and all of the Dominators retreat. The Teams celebrate their victory and Cisco creates an interdimensional extrapolator for Kara so she could create breaches to come to their earth if they need her help or they come to her earth if ever she needed their help. Kara, Barry and Oliver have a group hug and Diggle forgives Barry before they all said goodbyes. Caitlin Snow continues to try and help Stein get through to his daughter Lily whom he reveals was the result of a time aberration he caused in 1987. He tells Jax about her after he connects with her but tells him not to tell the rest of their team.
The Flash​​ S3 11. "Dead or Alive" Supergirl​​ S2
While Cisco and Gypsy battle in all of the Multiverse, they end up in Earth-38 and enter CatCo Worldwide Media and disappear into the portal. Eve Teschmacher watches this and says this is why National City gets weirder and weirder every day.
Arrow​​ S5 11. "Second Chances" The Flash​​ S3
Oliver calls for some help from Captain David Singh as the Green Arrow, even needing some assistance from The Flash himself when he needed to prove to this to Singh himself.
The Flash​​ S3 17. "Duet" Supergirl​​ S2
Mon-El and J'onn J'onzz travel to Earth-1 carrying a comatose Kara to ask Team Flash for help. Music Meister hypnotizes Barry and sends him into the same dream world as Kara, where they are instructed to reach the end of the musical in order to leave. Wally, Cisco and J'onn confront and defeat the Music Meister. Mon-El and Iris later confront him, and he tells them the only way to bring Barry and Kara back lies within themselves. They are later able to awake them via a kiss. Music Meister then reveals his plan all along was to teach them a lesson about love, then fades away to teach his lesson to others. Kara, Mon-El and J'onn then depart for Earth-38.

2017–2018 season

Episode from # Episode name Show(s) crossing over
DC's Legends of Tomorrow​​ S3 01. "Aruba-Con" The Flash​​ S4
Nate is seen working alongside Kid Flash in fighting crime in Central City after the Legends are disbanded.
The Flash​​ S4 05. "Girls Night Out" Arrow​​ S6
Felicity Smoak comes to Central City for Iris West's bachelorette party.
DC's Legends of Tomorrow​​ S3 05. "Return of the Mack" Arrow​​ S6
Legends consult with Curtis Holt about a Palmer Technologies watch with Oliver Queen's fingerprints, which turns out to be one belonging to Damien Darhk, who is later resurrected.
Supergirl​​ S3 08. "Crisis on Earth-X, Part 1" The Flash​​ S4Arrow​​ S6DC's Legends of Tomorrow​​ S3Freedom Fighters: The Ray​​ (set after its S2)
On Earth-X, a Nazi regime rules the planet, where an archer known as Dark Arrow is the Führer. Dark Arrow seizes a temporal gateway from the Freedom Fighters, which enables interdimensional travel to other universes. On Earth-1, Barry Allen and Iris West's friends, including Kara Danvers and her adoptive sister Alex Danvers from Earth-38, come to Central City for Barry and Iris' wedding. Harry Wells, Cisco Ramon, and Caitlin Snow develop a serum to separate the Firestorm matrix from Martin Stein and Jefferson Jackson; however, Jefferson is reluctant to give up being Firestorm. Alex meets the Legends' leader Sara Lance, taking the first step to recover from her break up with Maggie. Oliver re-proposes to Felicity, but she is not ready to marry him. The wedding ceremony is interrupted by invaders from Earth-X led by Dark Arrow, his Kryptonian wife Overgirl, and Prometheus (Earth-X). After Kara injures Overgirl, and Alex and Sara capture Prometheus during the fight, the Nazis retreat. Dark Arrow, who is Oliver's doppelgänger, and Overgirl, who is Kara's doppelgänger, unmask themselves as they discuss their next step with Eobard Thawne.
Arrow​​ S6 08. "Crisis on Earth-X, Part 2" Supergirl​​ S3The Flash​​ S4DC's Legends of Tomorrow​​ S3Freedom Fighters: The Ray​​ (set after its S2)
In S.T.A.R. Labs, Prometheus of Earth-X is revealed to be a parallel universe doppelgänger of Tommy Merlyn. After cruelly taunting Oliver over his attachment to Tommy, Prometheus commits suicide out of loyalty to Earth-X's Nazi regime. Harry reveals that through his exploration of the multiverse, he discovered that Earth-X is a dystopian world where World War II was not won by the Allied Forces. Prometheus' partners, Dark Arrow (Oliver's doppelgänger), Overgirl (Kara Danvers' doppelgänger), and Eobard Thawne steal a sub-light generator, the Prism, from research company Dayton Optical Systems. Oliver, Barry, Kara, and the others believe that Dark Arrow seeks to build a neutron bomb with it to aid his conquest on Earth-1. After a series of battles, Harry, Cisco, Caitlin, Mick Rory, Curtis Holt, Rene Ramirez and Dinah Drake are in captivity at S.T.A.R. Labs after the Nazi forces infiltrate it, and Oliver, Barry and his allies are transported to Earth-X's concentration camp, but Kara is moved to S.T.A.R. Labs. Oliver is determined to kill Dark Arrow after his capture. The villains reveal that Overgirl is dying from too much solar radiation in her heart and Black Arrow plans to use the Prism, charged by the S.T.A.R. Labs particle accelerator, to produce artificial red sunlight that would weaken both Kara's and Overgirl's invulnerability, allowing a heart transplant for Overgirl but killing Kara in the process.
The Flash​​ S4 08. "Crisis on Earth-X, Part 3" Supergirl​​ S3Arrow​​ S6DC's Legends of Tomorrow​​ S3Freedom Fighters: The Ray​​ (set after its S2)
Barry, Oliver, Sara, Alex, Martin and Jax wake up in a Nazi concentration camp on Earth-X, with power dampening handcuffs. The arriving SS-Sturmbannführer is revealed to be the Earth-X doppelgänger of Quentin Lance, who takes them away for execution, before they are saved by Citizen Cold, the Earth-X doppelgänger of Leonard Snart and Ray Terrill. Snart and Terrill take them to the underground headquarters of the Freedom Fighters, where the team meets the resistance movement's leader General Winn Schott, Winn Schott's Earth-X doppelgänger. They learn that the only way back to Earth-1 is through a temporal gateway in a Nazi facility, which Schott plans to blow up to strand Dark Arrow on Earth-1. Oliver disguises himself as Dark Arrow to infiltrate the facility and discovers the Nazi's doomsday device against parallel Earths is a militarized timeship called Wellenreiter. Oliver allows the timeship to enter Earth-1 to avoid jeopardizing his cover, but is ultimately exposed when he refuses to kill Felicity Smoak's Earth-X doppelgänger, a concentration camp prisoner. Oliver manages to save her from the Sturmbannführer. Barry and Ray battle the Freedom Fighters' Red Tornado to stop it from destroying the temporal gateway, while the rest of the team enters the facility. In attempting to reactivate the gateway's portal, Stein is shot and gravely wounded. Back on Earth-1, Thawne prepares to perform surgery on Kara to save Overgirl at S.T.A.R. Labs. Felicity and Iris try to stop him, but are captured.
DC's Legends of Tomorrow​​ S3 08. "Crisis on Earth-X, Part 4" Supergirl​​ S3Arrow​​ S6The Flash​​ S4Freedom Fighters: The Ray​​ (set after its S2)
Kara, Felicity and Iris are saved from Thawne by Ray Palmer, while Nate releases everyone from the pipeline. On Earth-X, Stein activates the temporal gateway's portal before succumbing to his injuries. Jax bonds with Stein to get him through the portal, along with Barry, Oliver, Sara, Alex, Ray Terrill and Leo Snart (Leonard Snart's Earth-X doppelgänger). Members of all the teams face off against Metallo of Earth-X, while Felicity and Kara are cornered by Dark Arrow before Oliver saves them. Stein is kept alive by his connection to Jax, but it is slowly killing them both. Stein severs their connection and dies from his injuries. Jax delivers the news to Clarissa and Lily. Dark Arrow offers a truce to the team, saying they will leave in peace if the team surrenders Supergirl. Oliver refuses and the team battles the Earth-X doppelgängers and their forces. Caitlin, Amaya and Zari infiltrate the Nazi's timeship Wellenreiter to disable its shields, so Harry, piloting the Waverider with Cisco, can destroy it. Defeating Thawne, Barry allows him to escape, unwilling to kill him. Supergirl battles Overgirl, and when Overgirl goes nuclear, Kara flies her into space to detonate. Oliver subsequently kills his doppelgänger. Cisco opens a breach to Earth-X for Ray to return, with Snart choosing to stay and join the Legends. Ray also receives a device from Barry that allows him to contact Earth-1 directly. The team holds a funeral for Martin. The Legends, Kara and Alex depart back to their own lives. Barry and Iris are officially married by John Diggle, with Oliver and Felicity doing the same.
09. "Beebo the God of War" Constantine (set after its S1)
John Constantine infiltrates the Waverider as Sara drops off Jax as he chooses to leave the Legends. Stating that she has a debt to repay to him after he saved her soul two years ago, John requests Sara's help to face a demon that is possessing a little girl who knows about Sara.
Freedom Fighters: The Ray​​ S1 05. "Episode Five" The Flash​​ S3
Cisco and Caitlin notice the suspicious radioactivity over Tulsa, a result of Ray Terrill's powers.
Arrow​​ S6 13. "The Devil's Greatest Trick" The Flash​​ S4
Oliver has Barry rush him and John to meet Cayden James before he leaves Star City.
DC's Legends of Tomorrow​​ S3 10. "Daddy Darhkest" Constantine (set after its S1)
John Constantine and the Legends deal with Mallus.
11. "Here I Go Again" The Flash​​ S4
Rip Hunter arrives at a Chinese monastery, where Wally West is meditating. He introduces himself, and tells Wally he is trying to save the universe, and needs his help.
15. "Necromancing the Stone" Constantine (set after its S1)
When Sara falls under the control of Mallus, Ava Sharpe and Gary Green ask John Constantine for help.
18. "The Good, The Bad and The Cuddly" Constantine (set after its S1)
Following the Legends' victory over Mallus, Constantine, accompanied by Gary find the Legends relaxing in Aruba and present them a severed dragon head. After confirming it was Sara's idea to release Mallus, Constantine tells them that Mallus wasn't the only demon that was released.
The Flash​​ S4 22. "Think Fast" Arrow​​ S6
Barry runs to Star City and brings John Diggle to reveal the location of the A.R.G.U.S. facility which holds Neil Borman .

2018–2019 season

Episode from # Episode name Show(s) crossing over
The Flash​​ S5 09. "Elseworlds, Part 1" Arrow​​ S7Supergirl​​ S4Batwoman (set after "Who Are You?")​​ • The Flash​​ (CBS, set after its S1)
The Flash of Earth-90 is seen crawling towards a book, but a mysterious stranger picks it up and uses it to destroy that reality; though the Flash escapes. On Earth-1, the stranger presents the book to Arkham Asylum psychiatrist Dr.John Deegan and instructs him to rewrite reality as he sees fit. The following morning Oliver and Barry discover that they have swapped lives, with everyone believing they are each other. When they seek the assistance of Team Flash, they do not believe them and lock Barry and Oliver in the pipeline. Barry and Oliver use each other's abilities to escape and convince a reluctant Iris to allow them to flee to Earth-38 to enlist the help of Kara. Meanwhile, a robot that can copy others' abilities called A.M.A.Z.O. awakens and threatens Central City. Cisco retrieves Oliver and Barry from Earth-38, with Kara and her cousin Clark providing assistance. Back on Earth-1, the heroes stop A.M.A.Z.O. After defeating A.M.A.Z.O., Cisco vibes the mysterious figure and Deegan. The figure tells the group that something is coming and they will not be able to stop it. While Clark returns to protect Earth-38, Oliver realizes the figure and Deegan were located in Gotham.
Arrow​​ S7 09. "Elseworlds, Part 2" The Flash​​ S5Supergirl​​ S4Batwoman​​ (set after "Who Are You?")​​ • The Flash​​ (CBS, set after its S1)
Oliver, Barry Allen, and Kara Danvers head to Gotham City to find John Deegan, but are quickly arrested. However, they are bailed out by Kate Kane, who tells them Deegan can be found at Arkham Asylum. With some assistance from Oliver and Barry's teams, they break in to confront Deegan and retrieve the book he used to rewrite reality; only for the doctor to escape and cause a mass breakout. While trying to contain it, Batwoman shows up to help them before telling them to leave Gotham. Returning to A.R.G.U.S., the heroes attempt to unlock the book when the Flash of Earth-90 breaches through to them and warns them of the Monitor. Oliver, Barry, Kara, and Earth-90's Flash go to confront Monitor, but the omnipotent being escapes and returns the book to Deegan; who changes reality once more. This time, Oliver and Barry wake up as wanted criminals and are forced to contend with both police and a black-suited Superman.
Supergirl​​ S4 09. "Elseworlds, Part 3" The Flash​​ S5Arrow​​ S7Batwoman​​ (set after "Who Are You?")​​ • DC's Legends of Tomorrow S4
Barry Allen and Oliver Queen wake up as wanted criminals hunted by John Deegan as a black suited Superman while Kara is imprisoned at S.T.A.R. Labs, with a rewritten Alex guarding her. After narrowly escaping Deegan, Barry and Oliver locate Cisco Ramon, who works as a mob boss with James as a henchman, and retrieve Superman from Earth-38. Supergirl convinces Alex to release her, and together with Barry retrieves the Book of Destiny. Superman uses the book to return Barry and Oliver to their original forms, but Deegan steals it back. Barry and Kara travel in opposite directions to slow the Earth's rotation in order to impede Deegan, despite Clark saying it will kill them. With help from Lois, Brainy, and J'onn, Superman and Oliver successfully defeat Deegan and restore Earth-1 to normal. On Earth-38, Clark reveals Lois is pregnant, and they are going to be moving to Argo City for a while, leaving Earth in Kara's hands. Clark proposes to Lois and she accepts. On Earth-1, Oliver gets a call from Batwoman, revealing Deegan is in Arkham and has seemingly made friends with the Psycho-Pirate.
Arrow S7 12. "Emerald Archer" The Flash S5
In the many interviews of those who knew Oliver Queen as well as the Green Arrow for the Emerald Archer documentary, Barry Allen was one of them. Giving his thoughts on his history with Oliver. Though clumsily redirecting his own knowledge of him and connection to Green Arrow as The Flash.
Arrow​​ S7 18. "Lost Canary" DC's Legends of Tomorrow​​ S4
After being accused of murder and having her criminal past exposed, Laurel goes full Black Siren and teams up with an old criminal acquaintance, Shadow Thief, to go on a crime spree around Star City. While Dinah aims to bring Laurel in, Felicity refuses to give up on her friend and tries everything to get through to her, even summoning Sara Lance for help. However, Laurel rebuffs all her efforts, forcing the former friends to face off against each other.

2019–2020 season

Episode from # Episode name Show(s) crossing over
Supergirl​​ S5 09. "Crisis on Infinite Earths: Part One" Arrow​​ S8The Flash​​ S6DC's Legends of Tomorrow​​ S5Batwoman​​ S1Freedom Fighters: The Ray (set after its S2) • Titans (set after its S2) • 1966 Batman (set after its S3) • 1989 Batman
The Monitor sends Harbinger to gather the worlds’ greatest heroes - Supergirl, the Flash, Green Arrow, Batwoman, White Canary, the Atom and Superman - in preparation for the impending Crisis. With their worlds in imminent danger, the superheroes suit up for battle while J'onn and Alex recruit Lena to help them find a way to save the people of Earth-38.
Batwoman​​ S1 09. "Crisis on Infinite Earths: Part Two" Arrow​​ S8The Flash​​ S6Supergirl​​ S5DC's Legends of Tomorrow​​ S5Smallville (set after its S10) • Constantine (set after its S1) • Superman Returns
The group uses Ray’s invention to track new recruits to help save the universe. The Monitor sends Iris, Clark and Lois in search of a mysterious Kryptonian, while Kate and Kara head out to find Bruce Wayne. In addition, Mia challenges Sara, Rory discovers a hidden talent, and Lex Luthor returns.
The Flash​​ S6 09. "Crisis on Infinite Earths: Part Three" Arrow​​ S8Supergirl​​ S5DC's Legends of Tomorrow​​ S5Black Lightning S3Batwoman​​ S1The Flash (CBS, set after its S1) • Birds of Prey (set after its S1) • Constantine (set after its S1) • Lucifer (set before its S1) • Superman Returns
Pariah enlists Black Lightning to help stop the Anti-Monitor after Flash-90 shares what he learned from his battle in "Elseworlds". With the help of Black Lightning, Barry, Cisco and Killer Frost come up with a plan that could save them all. Meanwhile, Iris has a heart-to-heart with Ryan Choi, while Oliver and Diggle return to an old familiar stomping ground.
Arrow​​ S8 08. "Crisis on Infinite Earths: Part Four" The Flash​​ S6Supergirl​​ S5DC's Legends of Tomorrow​​ S5Batwoman​​ S1The Flash
Stuck in the Vanishing Point, the Paragons search for a way to escape. The futility of the situation is compounded by The Flash's disappearance. However, hope appears in the form of Oliver, who reveals that he has become something else. Meanwhile, the origin stories for The Monitor and Anti-Monitor are revealed.
DC's Legends of Tomorrow​​ S5 00. "Crisis on Infinite Earths: Part Five" Arrow​​ S8The Flash​​ S6Supergirl​​ S5Black Lightning​​ S3Batwoman​​ S1TitansDoom PatrolSwamp ThingStargirlGreen LanternSuperman Returns
Worlds lived, worlds died. Nothing will ever be the same.
Arrow​​ S8 10. "Fadeout" The Flash​​ S6Supergirl​​ S5DC's Legends of Tomorrow​​ S5
Barry Allen, Kara Danvers, and Sara Lance attend Oliver Queen's funeral, the latter of whom uses the Waverider to bring Mia Queen to her father's funeral.
The Flash​​ S6 10. "Marathon" Arrow​​ S8 (set before "Fadeout")
Diggle goes to visit Barry and gives him Oliver's mask.

2021 season

Episode from # Episode name Show(s) crossing over
Batwoman​​ S2 16. "Rebirth" Arrow​​ (set after its S8)
Diggle meets Luke Fox while visiting Gotham City for a medical check-up.
The Flash​​ S7 16. "P.O.W." Arrow​​ (set after its S8)
Diggle goes to Central City with a weapon to help Barry with the Godspeed War.
Superman & Lois S1 12. "Through the Valley of Death" Arrow​​ (set after its S8)
Diggle goes to Smallville, bringing in a weapon which is meant to stop a possessed Superman. In the end, Superman frees himself from the possession and the weapon is used on Morgan Edge.
Supergirl​​ S6 12. "Blind Spots" Arrow​​ (set after its S8)
Diggle goes to National City and supports Kelly Olsen in embracing the Guardian mantle.

2021-2022 season

Episode from # Episode name Show(s) crossing over
The Flash​​ S8 01. "Armageddon, Part 1" DC's Legends of Tomorrow​​ (set after Ray Palmer's departure in S5)
Ray Palmer arrives in Central City for Tech Con and helps fight Despero.
02. "Armageddon, Part 2" Supergirl (set after its S6) • Black Lightning (set after its S4)
Team Flash contacts Alex Danvers for information about Despero. After the Flash commits several crimes without remembering them, he goes to Black Lightning at the Hall of Justice for help.
03. "Armageddon, Part 3" Black Lightning (set after its S4) • Supergirl (set after its S6) • Batwoman S3
Black Lightning assists the Flash with depleting him of his speed to hopefully prevent him from causing Armageddon in the first place. After Despero discovers where the Flash is, he is forced to time travel to 2031. There, a future Ryan Wilder and Alex Danvers are attending a ceremony held by Eobard Thawne and Iris West.
04. "Armageddon, Part 4" Supergirl (set after its S6) • Batwoman S3DC's Legends of Tomorrow (set after Damien Darhk's death in S3)
Sentinel and Batwoman assist Team Flash against Barry Allen/Reverse-Flash. Barry and Damien Darhk work together to reset the Reverse-Flashpoint timeline, commencing Armageddon in the process.
05. "Armageddon, Part 5" DC's Legends of Tomorrow​​ (set after Damien Darhk's death in S5) • Arrow (set after its S8)
Due to his usage of the time stone, Damien Darhk is sent back to 2021 after resetting the timeline. Meanwhile, Mia Queen time travels to 2021 to hopefully find a lead to William Clayton's whereabouts, but she reaches a dead end. Mia is then mind controlled by Despero to prevent Team Flash from taking away Eobard Thawne's speed, as allowing him to die will permanently erase him from the timeline. However, Despero's plan fails and he is defeated by the Flash. Later, Damien is reunited with his daughter, Nora, one last time.
Batwoman S3 09. "Meet Your Maker" Arrow (set after its S8)
Diggle helps Jada Jet in locating the Joker's joy buzzer. Later, he asks Luke Fox to try to open the box containing the unknown green object, but Luke is unsuccesful.
The Flash​​ S8 18. "The Man in the Yellow Tie" Arrow (set after its S8) • DC's Legends of Tomorrow​​ (set after its S7)
Diggle seeks help from Eobard Thawne on Lian Yu to open the box containing the unknown green object. He eventually rejects the offer made to him and the box vanishes. Later, Chester seeks help from Ray Palmer after Barry encounters another version of Thawne at Fast Track Labs.


  • While not an official crossover event, David Ramsey made guest appearances on Batwoman, DC's Legends of Tomorrow, The Flash, Superman & Lois, and Supergirl in the 2021 season. His appearances on Batwoman, The Flash, Superman & Lois, and Supergirl serve as a story arc of what happened after John Diggle discovered the unknown green object at the end of Arrow.