Here is every single cameo in the Arrowverse's Crisis On Infinite Earths. The five-part event is the most ambitious crossover ever and, as many fans theorized, it resulted in a reboot of The CW's shared superhero universe. By the conclusion of Crisis, Supergirl and Black Lightning ceased existing on separate Earths in the Multiverse and joined The Flash, Arrow, and DC's Legends of Tomorrow on the same combined world, Earth Prime.

In addition, Crisis On Infinite Earths was the Arrowverse's celebration of the past DC Comics TV shows and movies that paved the way and the crossover's finale also set the stage for DC TV series to come. For Superman fans, Crisis was even more special for including three versions of the Man of Steel, including the Arrowverse's Superman (Tyler Hoechlin), Smallville's Clark Kent (Tom Welling), and the Kingdom Come Superman (Brandon Routh). Most shockingly, the Arrowverse acknowledged the DC Extended Universe movies for the first time when Justice League's Flash (Ezra Miller) appeared in Crisis Part 4 and came face-to-face with the Arrowverse's Flash (Grant Gustin). Overall, Crisis was a loving ode to DC Comics across all media; the crossover's conclusion venerated Oliver Queen (Stephen Amell) as the Arrowverse's founding hero who then enabled the Rebirth of the Multiverse.

Related: Crisis Moves All Arrowverse Shows Onto One Earth

Crisis also featured appearances by most of the Arrowverse's cast of superheroes as well as some of its notable villains. In Crisis Part 4, the Paragons traveled through the Speed Force to key moments of Green Arrow's past, encountering Oliver Queen's memories of his enemies Malcolm Merlyn (John Barrowman), Damien Darhk (Neal McDonough), Prometheus (Josh Segarra), and Elseworlds' evil Black Suit Superman. But a lot of the pure fun of Crisis were the cameos from other DC properties and the pure ambition of the Arrowverse's producers paid off with several unforgettable appearances. Here's every cameo in Crisis On Infinite Earths.

Alexander Knox (Robert Wuhl) - Earth-89

Reporter Alexander Knox from Tim Burton's Batman 1989 watched the antimatter wave attack Gotham City in "Part 1" of Crisis. The headline of the Gotham Gazette he's holding also indicates that Jack Nicholson's Joker returned from the dead to tangle with Batman (Michael Keaton) again.

Hawk (Alan Ritchson) and Jason Todd (Curran Walters) - Earth-9

Representing DC Universe's Titans, Hawk and Robin (the Jason Todd version) were shown in San Francisco reacting to the antimatter wave coming to destroy Earth-9 during "Part 1".

The Ray (Russell Tovey) - Earth-X

The Ray looking intently in Crisis on Earth-X

One of the only superheroes on the Nazi-controlled Earth-X, which was introduced in 2017's Crisis On Earth-X crossover, The Ray was powerless against the antimatter wave ravaging the multiverse in "Part 1".

Related: Arrowverse's New Multiverse Revealed - What Shows Are On What Earths

Dick Grayson (Burt Ward) - Earth-66

Burt Ward as Dick Grayson on Earth-66 in Crisis on Infinite Earths

Dick Grayson, the former Robin the Boy Wonder from the original 1960s live action Batman TV series, was walking his dog when he saw the antimatter wave above Gotham City, which made him exclaim, "Holy crimson skies of death!"

Doomsayer Signholder (Wil Wheaton) - Earth-38

Wil Wheaton appeared in "Part 1" as a doomsayer holding a sign that nodded to a similar person in Superman II, who held an identical sign when General Zod (Terence Stamp), Ursa (Sarah Douglas), and Non (Jack O'Halloran) battled Superman (Christopher Reeve).

Leonard Snart's Voice (Wentworth Miller) - Earth-74

Steampunk Waverider on Earth-74 in Crisis on Infinite Earths

"Part 2" shows Earth-74, where Leonard Snart aka Captain Cold is the voice and artificial intelligence of the Waverider, which Harbinger (Audrey Anderson) commandeers along with the Mick Rory of Earth-74 (Dominic Purcell) to serve as the time ship of the Paragons.

Bruce Wayne (Kevin Conroy) - Earth-99

Kate Kane and Bruce Wayne in a mechanised suit face to face with a Batman suit in Crisis on Infinite Earths

Earth-99's Bruce Wayne was believed to be the Paragon of Courage in "Part 2", but Batwoman (Ruby Rose) discovered this former Batman was a twisted, broken shell of himself. Wayne was aided by Earth-99's version of Luke Fox (Camrus Johnson) and he killed his world's Superman, although the injuries he sustained in the battle doomed him to wear an exoskeleton.

Related: Arrowverse's Official Justice League Team Revealed On Crisis On Infinite Earths

Clark Kent (Tom Welling) And Lois Lane (Erica Durance) - Earth-167

Smallville-Lois-Superman-Crisis-On-Infinite-Earths

On Earth-167's Smallville, shown in "Part 2", Clark Kent gave up his powers and his role as Superman to raise a family with Lois Lane on the Kent Farm. Meanwhile, Lex Luthor (Michael Rosenbaum) is serving out his term as President of the United States.

Kingdom Come Superman (Brandon Routh) - Earth-96

Crisis on Infinite Earths Kingdom Come Superman Brandon Routh

Brandon Routh reprises his role as Superman in "Part 2" of Crisis. The Paragon of Truth, Kingdom Come Superman aka Clark Kent suffered a series of tragic losses, including the deaths of Lois Lane (Kate Bosworth) and Perry White (Frank Langella). He changed the yellow on his S crest to black to symbolize that even when things are darkest, hope shines through.

Jonah Hex (Johnathon Schaech) - Earth-16

Johnathon Schaech as Jonah Hex of Earth-18 in Crisis on Infinite Earths

The Jonah Hex of Earth-16 tried to stop Mia Smoak (Katherine McNamara), Sara Lance (Caity Lotz), and John Constantine (Matt Ryan) from accessing a Lazarus Pet in "Part 2". This Jonah never met the Legends and became an ally, unlike the Hex of Earth-1.

Huntress (Ashley Scott) - Earth-52

Ashley Scott as Helena Kyle Huntress of Earth-203 Birds of Prey in Crisis on Infinite Earths

The Huntress of the 2002 Birds of Prey TV series, who is the daughter of Batman and Catwoman, was powerless to stop the antimatter have from destroying Earth-52 in Crisis "Part 3".

Related: How Lucifer Expands And Improves The Arrowverse

Lucifer Morningstar (Tom Ellis) - Earth-666

Tom Ellis as Lucifer in Crisis on Infintie Earths

Crisis "Part 3" showed Earth-666, where Lucifer Morningstar gave John Constantine, Mia Smoak, and John Diggle (David Ramsey) a magical playing card allowing them access Purgatory in order to rescue Oliver Queen's soul. Curiously, the Devil is still running his nightclub Lux, which contradicts the ending of Lucifer season 4, and indicates this scene happens before the events of the Lucifer TV series.

The Flash (John Wesley Shipp) And Tina McGee (Amanda Pays) - Earth-90

The Flash Barry Allen Earth-90 John Wesley Shipp Crisis on Infinite Earths

Trapped on a cosmic treadmill by the Anti-Monitor since he vanished during last year's Elseworlds crossover, The Flash of Earth-90 took Earth-1 Flash's place and sacrificed his life to destroy the antimatter cannon in the climax of Crisis "Part 3". As his life flashed before his eyes, Barry remembered a touching moment his love, Tina McGee, from decades ago.

Black Lightning (Cress Williams) - Freeland

Black Lightning in Crisis on Infinite Earths Part 3

Black Lightning was brought to Earth-1 by Pariah (Tom Cavanagh) in "Part 3" to help free The Flash of Earth-90 from the cosmic treadmill. Later, Black Lightning would return on Earth-Prime to fight off Shadow Demons at STAR Labs alongside Mick Rory and Killer Frost (Danielle Panabaker), and he would become a founding member of the Arrowverse's (possible) Justice League.

Jim Corrigan (Stephen Lobo) - Purgatory

The former human host of the Spectre, Jim Corrigan passed on the supernatural force to Oliver Queen in "Part 3", and prepared him for his pivotal role to battle the Anti-Monitor at the dawn of time and restore the Multiverse.

Related: Crisis On Infinite Earth's New Spectre Costume Is Disappointing

Xneen Novu (Melanie Merkosky) - Maltus

Crisis "Part 4" shows the origin of the Anti-Monitor: ten thousand years ago on the planet Maltus, Xneen Novu was the wife of Mar Novu, and served as his Monitor when he made his ill-fated expedition to the dawn of time. This interference in time created the Anti-Monitor and the antimatter universe.

The Flash (Ezra Miller) - DCEU

Ezra Miller and Grant Gustin as Flash

The Flashes of two worlds met when Barry Allen from the DC Extended Universe shockingly appeared in the Speed Force and came face-to-face with the Flash of Earth-1. Not only did the DCEU's Barry mention "Victor" [Stone] aka Cyborg (Ray Fisher), it seems like he didn't have a superhero name until Earth-1's Barry introduced himself as the Flash.

Weather Witch (Reina Hardesty) - Earth Prime

Introduced in The Flash season 5, the Weather Witch attacked National City in "Part 5", which made Supergirl and the Flash realize that Earth-1 and Earth-38 are no more and have merged into one Earth Prime.

Marv Wolfman - Earth Prime

A fan named Marv met Supergirl and the Flash in National City after they defeated the Weather Witch. This is, of course, Marv Wolfman, the acclaimed writer of DC's Crisis On Infinite Earths comics and he also co-wrote Crisis On Infinite Earths Part 4.

Related: Crisis On Infinite Earths: Is Oliver Queen Really Dead? 

Beebo - Earth Prime

Ultimately proven to be an illusion, the giant Beebo terrorized Star City in "Part 5". This was the first time an enormous version of the huggable blue toy appeared since the Legends combined to form the giant "Voltron Beebo" to defeat the demon Mallus in the finale of Legends of Tomorrow season 3.

Sargon The Sorcerer (Raul Herrera) - Earth Prime

A surprise villain appearance, Sargon the Sorcerer tried to rob a Star City bank while using the giant Beebo as a distraction but he was quickly defeated by Sara Lance and the Flash in "Part 5" of Crisis.

Stargirl - Earth 2

Crisis on Infinite Earths Stargirl Cast Earth-2 Arrowverse

Although Earth-2 was destroyed during the Crisis, Oliver Queen/The Spectre igniting the Rebirth of the Multiverse changed Earth-2 in "Part 5", which is now the home of the upcoming TV series Stargirl and her cast: Stargirl (Brec Bassinger), Hourman (Lou Ferrigno, Jr.), Doctor Mid-Nite (Henry Thomas), Wildcat (Yvette Monreal), and S.T.R.I.P.E., also known as the Justice Society of America.

Green Lanterns - Earth-12

Arrowverse Earth-12 Oa Green Lantern Corps Crisis on Infinite Earths

Earth-12 is now the official designation of the universe where the upcoming HBO Max Green Lantern series will take place. Crisis "Part 5" showed the Guardians of the Universe's homeworld, OA, and the assembled might of the Green Lantern Corps.

Swamp Thing (Derek Mears) - Earth-19

Arrowverse Crisis on Infnite Earths Swamp Thing Earth-19

Although Swamp Thing's DC Universe TV series is canceled, the Earth elemental now officially exists on Earth-19 following "Part 5".

Titans - Earth-9

Titans Season 2 Team Superboy Ravager Nightwing Hawk Dove Titans Season 1 Robin Raven Starfire Beast Boy

Raven (Teagan Croft), Jason Todd (Curran Walters), Hawk (Alan Ritchson), Dove (Minka Kelly), Starfire (Anna Diop) are shown in "Part 5". Returning for season 3 in 2020, Titans is DC Universe's biggest success story and the adventures of the teen superheroes will continue on Earth-9.

Doom Patrol - Earth-21

Arrowverse Crisis on Infinite Earths Earth-21 Doom Patrol dancing

Although they were introduced in Titans season 1, Doom Patrol's Negative Man (Matt Bomer), Rita Farr (April Bowlby), Jane (Diane Guerrero), Robotman (Brendan Fraser), and Cyborg (Joivan Wade) now officially have their own Earth, which has been designated as Earth-21, in Crisis "Pat 5". DC Universe's weirdest superhero team is alive and well.

Kingdom Come Superman (Brandon Routh) - Earth-96

Arrowverse Earth-96 Kingdom Come Bradon Routh Superman Criisis on Infinite Earths

Despite being killed and replaced as the Paragon of Truth by Lex Luthor (Jon Cryer), the Kingdom Come Superman was resurrected along with his Earth-96. While it's unknown whether any of the tragedies he suffered have been reversed when the Multiverse was restarted, Superman found his hope again as indicated by the yellow replacing the black on his S crest.

Gleek

Crisis on Infinite Earths Gleek Cage Superfiriends Arrowverse Space Monkey

Although he was only heard and not seen, a monkey named Gleek escaped and is hanging out in the rafters of the Hall of Justice on Earth Prime. Gleek is a shoutout to the classic 1970s Superfriends and the cartoon's memorable theme music also played as the Flash, Supergirl (Melissa Benoist), Batwoman, Superman, J'onn J'onzz (David Harewood), Black Lightning, and Sara Lance convened as a formal team for the first time.

Next: Crisis On Infinite Earths Ending And Arrowverse Future Explained