The cast of an Arrowverse Crossover, lined up in a row, includes characters like Mr. Terrific, Sarah Lance, The Flash, Arrow, The Atom and Captain Cold

Here’s A Detailed Guide to Watching the Arrowverse Crossovers in Order

When Arrow first aired on the CW in 2012, no one thought it would grow into the Arrowverse. The Arrowverse’s mastermind, Greg Berlanti, has always said that each step in the growth of the Arrowverse was a surprise. Additionally, producer Marc Guggenheim recalled to Entertainment Weekly that, when Arrow first premiered, whenever they were asked if the show would introduce any other superheroes, their answer was always a resounding “no.”

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Eleven years later, the final Arrowverse show left standing, The Flash, came to an end. But, the road to The Flash‘s finale was filled with exciting, intense, and sometimes downright ludicrous crossover events—the kind only possible in comic book media. The Arrowverse is made up of six broadcast shows and two web series, coming to a grand total of 40 seasons of television. If that sounds (understandably) daunting but you still want to know what the fuss was all about, you might be better off catching up with the Arrowverse’s infamous crossovers episodes instead of watching a seemingly never-ending amount of TV.

So, here are all of the Arrowverse crossover episodes in order. Get ready to meet Green Arrow, The Flash, Supergirl, and plenty more of DC’s finest superheroes.

Flash vs. Arrow (2014)

Grant Gustin as The Flash and Stephen Amell as The Green Arrow in The Flash vs Arrow crossover
(The CW)

This is the storyline that started the Arrowverse’s annual crossover trend. Spread over two episodes, one in each series, Flash vs. Arrow sees The Flash and Green Arrow help each other solve various crimes in their respective cities involving a deadly boomerang-wielder. Watch The Flash Season 1, Episode 8: “The Flash vs. Arrow (I)” and Arrow Season 3, Episode 8: “The Brave and the Bold (II).”

Heroes Join Forces (2015)

Speedy, Green Arrow, Black Canary, The Flash, Spartan, Hawkgirl and Hawkguy in the Heroes Join Forces Arrowverse crossover
(The CW)

Serving as an introduction for DC’s Legends of Tomorrow show, Heroes Join Forces sees Team Flash and Team Arrow take on the villain Vandal Savage while trying to protect Hawkman (a.k.a. Carter Hall) and Hawkgirl (a.k.a Kendra Saunders). Watch The Flash Season 2, Episode 8:”Legends of Today (I)” and Arrow Season 4, Episode 8: “Legends of Yesterday (II)”.

World’s Finest (2016)

Melissa Benoist as Supergirl and Grant Gustin as The Flash in Supergirl season 1, episode 18 "World's Finest"
(The CW)

Though this Arrowverse crossover only lasts for one episode, it’s still a fun one. The Flash suddenly appears in Supergirl’s alternate universe (Earth-38) and helps her defeat Silver Banshee and Livewire so that she can help him find a way back home. This was the first time these two characters interacted, but it certainly wouldn’t be the last. Watch Supergirl season 1, episode 18: “World’s Finest.”

Invasion! (2016)

Steel, Spartan, The Flash, Green Arrow, Vixen and Heat Wave standing in formation on the ground, with Firestorm, Supergirl and The Atom floating behind them in the Invasion! Arrowverse crossover event
(The CW)

The first crossover to utilize characters from Supergirl, Invasion! sees Earth being invaded by an alien race called the Dominators. The Flash and Green Arrow soon realize that they need Supergirl and the Legends’ help to stop them. Invasion! is also the first Arrowverse crossover to take place across more than two shows and two episodes. Watch Supergirl Season 2, Episode 8: “Medusa (I)”, The Flash Season 3, Episode 8: “Invasion! (II)”, Arrow Season 5, Episode 8: “Invasion! (III)”, and Legends of Tomorrow Season 2, Episode 7: “Invasion! (IV)”.

Duet (2017)

Grant Gustin as Barry Allen and Mellisa Benoist as Kara Zor-El in The Flash season 3, episode 17 "Duet" Arrowerse Crossover episode
(The CW)

Another Flash and Supergirl-centric Arrowverse crossover, “Duet” sees Barry Allen, Kara Zor-El, and their friends trapped in a romanticized, fictional, vintage musical world, giving us better insight into their characters, strengthening their bond, and diving deeper into their respective relationships. Watch Supergirl season 2, episode 16 “Star-Crossed” and The Flash season 3, episode 17: “Duet.”

Crisis on Earth-X (2017)

Green Arrow stands in front of a group of heroes
(The CW)

The fourth Arrowverse crossover overall, Crisis on Earth-X served as a set-up for the animated web miniseries Freedom Fighters: The Ray. Barry Allen and Iris West’s wedding is interrupted by Nazis from Earth-X intent on taking over the world. Watch Supergirl Season 3, Episode 8: “Crisis on Earth-X (I)”, Arrow Season 6, Episode 8: “Crisis on Earth-X (II)”, The Flash Season 4, Episode 8: “Crisis on Earth-X (III)”, and Legends of Tomorrow Season 3, Episode 8: “Crisis on Earth-X (IV)”.

Elseworlds (2018)

The Flash, Green Arrow, and Supergirl stand together
(The CW)

When an Arkham Asylum doctor rewrites reality, Barry Allen and Oliver Queen swap lives–and they’re the only ones who know that something is wrong. Elseworlds is the first Arrowverse crossover to include Batwoman, as well as Tyler Hoechlin’s version of Superman (despite Superman & Lois not officially being part of the Arrowverse). Watch The Flash Season 5, Episode 9: “Elseworlds (I)”, Arrow Season 7, Episode 9: “Elseworlds (II)”, and Supergirl Season 4, Episode 9: “Elseworlds (III)”.

Crisis on Infinite Earths (2019)

Supergirl and the Flash stand together with different heroes
(The CW)

The Arrowverse’s biggest crossover ever, Crisis on Infinite Earths brings together heroes from the Arrowverse and beyond (say hello to Tom Welling’s Clark Kent!) to prevent the villainous Anti-Monitor from ending all of reality. This crossover includes Black Lightning for the first time, as the Crisis on Infinite Earths storyline was featured in Black Lightning Season 3, Episode 9: “The Book of Resistance: Chapter Four: Earth Crisis”. For the full crossover, watch Supergirl Season 5, Episode 9: “Crisis on Infinite Earths: Part One (I)”, Batwoman Season 1, Episode 9: “Crisis on Infinite Earths: Part Two (II)”, The Flash Season 6, Episode 9: “Crisis on Infinite Earths: Part Three (III)”, Arrow Season 8, Episode 8: “Crisis on Infinite Earths: Part Four (IV)”, and Legends of Tomorrow Season 5, Episode 1: “Crisis on Infinite Earths: Part Five (V)”.

Armageddon (2021)

Grant Gustin as The Flash and Tony Curran as Despero talking to each other in The Flash's Armageddon five-part special
(The CW)

The first Arrowverse event without Stephen Amell’s Oliver Queen and the first to take place in just one show, Armageddon served as a five-episode kick-off for The Flash‘s eighth season. Team Flash is forced to turn to old friends and reluctant allies (including Ray Palmer, Mia Queen, Black Lightning, Damien Dahrk, and Batwoman) when the alien Despero comes to Earth convinced Barry will be responsible for the next Armageddon. Watch The Flash season 8, episodes 1-5.

It’s My Party and I’ll Die If I Want To (2023)

Spartan, Green Arrow, Flash, and Kid Flash in The Flash season 9, episode 9
(The CW)

The Arrowverse’s crossover episodes started with The Flash and Green Arrow, and it ended with them, too. In this episode, Team Flash throws Barry a surprise party for his birthday, but things go awry when Ramsey Rosso, a.k.a. Bloodwork, returns to threaten the existence of the Multi-Verse. Oliver and Barry share one final heartfelt moment, and John Diggle and Wally West also help save the day. Watch The Flash season 9, episode 9: “It’s My Party and I’ll Die If I Want To.”

If you’re looking for some fun, over-the-top superhero storytelling, then the Arrowverse’s crossover episodes are certainly a great place to start. Enjoy!

(featured image: The CW)


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El Kuiper
El (she/her) is The Mary Sue's U.K. editor and has been working as a freelance entertainment journalist for over two years, ever since she completed her Ph.D. in Creative Writing. El's primary focus is television and movie coverage for The Mary Sue, including British TV (she's seen every episode of Midsomer Murders ever made) and franchises like Marvel and Pokémon. As much as she enjoys analyzing other people's stories, her biggest dream is to one day publish an original fantasy novel of her own.