The CW's upcoming Crisis on Infinite Earths is shaping up to be one of television's most ambitious crossovers ever, as it unites various versions of DC heroes and villains from a plethora of different worlds.

Though the casts of the network's superhero shows alone would fill the crossover to the brim, Batwoman and a host of special guest appearances will pack the crossover to the brim with DC heroes from past and present. While the core casts of the shows involved will presumably have a role to play, CBR is rounding up all of the other characters and actors who've been confirmed to make an appearance in the crossover so far.

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Team Arrow

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Arrow was the show that started it all for the CW's universe of superheroes, and the series will end after its upcoming 10-episode season. While the series will almost certainly set up Oliver Queen's final adventure, he'll encounter a few familiar faces before he makes his final bow.

Although the show's total roster of characters remains unconfirmed, it will feature familiar faces David Ramsey's John Diggle, Rick Gonzalez's Rene Ramirez, Juliana Harkavy's Dinah Drake and Katie Cassidy's Laurel Lance as part of the main cast. They'll be joined by the future charactersL Joseph David-Jones' Connor Hawke, Katherine McNamara's Blackstar, Ben Lewis' William Clayton and Charlie Barnett's John Diggle Jr. Several older Arrow characters will also return for the series, including Willa Holland's Thea Queen, Colin Donnell's Tommy Merlyn and John Barrowman's Malcolm Merlyn.

Team Flash

The Flash Barry Allen hanging out with Jay Garrick

The Flash was actually the first show to actually mention the Crisis, foreshadowing it in the climax of its first episode. Naturally, Grant Gustin will appear in the event as Barry Allen/The Flash, and Candice Patton's Iris West-Allen and the rest of Flash's usually allies are likely to appear as well.

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John Wesley Shipp will also be appearing in the crossover, though it's not confirmed who he is playing. He previously played Barry's father Henry Allen in the first few seasons of the show, as well as appearing as Jay Garrick, the Earth-2 version of The Flash. Back in the 1990s, however, he played Barry Allen in the original live action The Flash TV series. He reprised that role in last year's Elseworlds crossover, and he'll may very well do the same in Crisis.

Team Legends

Legends of Tomorrow

The Legends of Tomorrow part of Crisis will kick off that show's newest season, though it'll be marked as a special event movie rather than the official season premiere. It's unknown which Legends will appear in the crossover itself. However. series mainstays like team leader Sara Lance/White Canary and Brandon Routh's Atom are almost certain to be a part of the event.

Johnathan Schaech will also return in the crossover as the scarred gunslinger Jonah Hex, having first played the role in Legends of Tomorrow. This suggests that the storyline will involve time travel of some sort, as well.

Team Black Lightning

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Characters from Black Lightning will supposedly be taking part in Crisis, though each cast member's role is still unknown. Series star Cress Williams is confirmed to appear as Jefferson Pierce/Black Lightning, however. The crossover will the character's first official interaction with the wider Arrowverse.

The series has been confirmed to heretofore not exist on the same Earth as Supergirl or The Flash and Arrow. This could all change with Crisis, however, especially since the original story melded several different Earths into one.

Batwoman

Batwoman feature

Ruby Rose will appear in the crossover event as Kate Kane/Batwoman, with the upcoming first season of her eponymous show being used to further set things up.

Given that Batwoman's first season, or at least the first half of it, takes places before last year's Elseworlds crossover, it's unknown how or when the series will skip ahead to the present to coincide with Crisis.

Supergirl's Superman and Lois Lane

Superman and Lois Lane Elseworlds Poster

Melissa Benoist will be reprising her role as Kara Zor-El/Supergirl in the crossover, but she'll have to make room for at least a few versions of her cousin. Crisis is confirmed so far to be bringing no less than three different versions of Superman on board.

Tyler Hoechlin will again play the version of Superman from Supergirl, with Elizabeth Tulloch returning as that Earth's Lois Lane. Fans will more than likely be introduced to the couple's child, hinted at in Elseworlds. However, there's always a chance that Superman may take Kara's sacrificial place in the climax of Crisis against The Anti-Monitor.

Kingdom Come Superman

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Legends of Tomorrow star Brandon Routh will also appear in the crossover  as the other DC hero he's famous for playing, Superman. Routh starred as the Man of Steel in the 2006 film Superman Returns.

In Crisis,  he'll portray the character again, but this time, it'll be as the older, slightly more cynical version from Alex Ross and Mark Waid's landmark comic book Kingdom Come. 

Smallville Superman

Clark Kent showing off his Superman suit in Smallville.

Some of the most recent announcements concerning casting involved the long speculated involvement from Smallville alumni. Tom Welling will return as the Smallville version of Clark Kent/Superman, and fans may finally get to see the actor don the hero's iconic costume for more than a fleeting moment.

RELATED: Welling's Crisis On Infinite Earth's Involvement Was A Top Arrowverse Priority

Smallville was the superhero show of the early 2000s, back before the genre was ubiquitous on the big and small screen. Thus, having the star of TV's biggest pre-Arrowverse return perfectly encapsulates the scope of this event.

Smallville Lois Lane

Erica Durance as Lois Lane (Smallville)

Erica Durance will also be joining Welling as that universe's version of Lois Lane. She has been confirmed to appear in several episodes of the event, meaning that her role may be pivotal in the story.

One possibility is that, as the "prime" Superman and Lois of the CW network, Smallville Superman and Lois may fill the pivotal roles that Golden Age Superman and Lois did in the Crisis crossover.

Supergirl's Lex Luthor

Jon Cryer will return in the crossover as Lex Luthor. He previously played the character on Supergirl, and though he met his end in the Season 4 finale, the Monitor revives him for unclear reasons.

The threat of The Anti-Monitor may require the intelligence of even the villainous Luthor to combat. Given the scope of the original Crisis comic book, there may even be multiple Luthors in the crossover.

Bruce Wayne

Kevin Conroy in Batman Beyond

Like Supergirl, Batwoman will also be joined by a version of her cousin. Kevin Conroy, who voiced Bruce Wayne/Batman in Batman: The Animated Series and across various other series, movies and video games for decades, will portray an older Bruce Wayne.

This hints at a potential Batman Beyond-inspired Earth appearing, since this is probably not the presumably younger Bruce Wayne of Batwoman's Earth.

Burt Ward's Character

Burt Ward Bamtan Robin Costume

Another classic superhero actor, whose role may be completely unrelated to the other heroes, will be in Crisis. Burt Ward, who portrayed Dick Grayson/Robin in the classic 1960s Batman TV series, will be appearing in a heretofore unspecified role.

There's a good chance that this completely unexpected casting will be for an equally surprising character. Still, he could be portraying the adult Robin of the '60s Batman Earth. Better yet, with Adam West gone, he could even play the Caped Crusader himself.

CLASSIC CRISIS CHARACTERS

LaMonica Garrett's Monitor in Elseworlds
The Flash -- "Elseworlds, Part 1" -- Image Number: FLA509d_0163b.jpg -- Pictured: LaMonica Garrett as The Monitor -- Photo: Katie Yu/The CW -- © 2018 The CW Network, LLC. All rights reserved

Tom Cavanagh, a mainstay of The Flash as various versions of the character Harrison Wells, will be playing a new version of him in Crisis. He'll also play Pariah, a character central to the story of the original Crisis comic. The story's central antagonist will again be The Anti-Monitor. Lamonica Garret will portray both The Anti-Monitor and his heroic counterpart The Monitor, a role which he first played in Elseworlds.

It's not known what other DC characters and shows that Crisis will pull into the mix, but it's certain that the Arrowverse will never be the same.

"Crisis on Infinite Earths" begins Sunday, December 8 at 8 pm ET/PT on Supergirl, then continues in Batwoman on Monday, December 8 at 8 pm ET/PT and in The Flash on Tuesday, December 10 at 8 pm ET/PT. After the winter hiatus, the crossover will conclude on Tuesday, January 14 in Arrow at 8 pm ET/PT and in DC's Legends of Tomorrow at 9 pm ET/PT.

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