After battling Nazis from Earth-X and putting an end to the reality-warping shenanigans of John Deegan, the heroes of the Arrowverse may face their biggest challenge yet in "Crisis on Infinite Earths." The five-show crossover is projected to be a whopping five hours long.

The CW Upfront presentation in New York City revealed that the crossover will air for over five hours in two quarters.

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DC's Legends of Tomorrow and Arrowverse newcomer Batwoman were reportedly pictured with the other heroes, indicating that they will be involved in the crossover.

Created by writer Marv Wolfman and artist George PĂ©rez, the original Crisis on Infinite Earths comic was a 12-issue maxiseries that rebooted the DC Universe's history and created a single universe by destroying the Multiverse. This, of course, didn't last, but among the more devastating events of the series were the deaths of Kara Zor-El's Supergirl and the Barry Allen incarnation of the Flash.

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Given the scope of the original comic, the long runtime of the crossover might be justified. Like Psycho-Pirate said at the end of last year's "Elseworlds" crossover, nothing will ever be the same again.

Slated to air in Fall 2019 on the CW, Crisis on Infinite Earths currently has no announced air date.

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