A crisis is coming to the Arrowverse. "Elseworlds," this year's three-show crossover, closed with a special announcement: "Crisis on Infinite Earths" is headed to the Arrowverse in Fall 2019.

Details about "Crisis on Infinite Earths" are scarce at this time. It is likely that "Crisis" will be next year's crossover, though that has not been officially confirmed. Considering the magnitude of this event, it is something that could extend across an even larger story. Stay tuned with CBR as we learn more about this killer event.

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Before the logo reveal, which you can check out below, "Elseworlds" led into the announcement with a stinger featuring Roger Hayden, aka Psycho Pirate. Batwoman called up Oliver to ask if John Deegan, who caused all the "Elseworlds" mayhem, would be causing any problems for her; as it were, Deegan had drawn the fascination of Psycho Pirate. The episode then cut to Psycho Pirate, who inhabits the cell next to Deegan's. "Don't worry, Doctor," the inmate told his former handler. "Everything is as it should be. The stage is set. Worlds will live. Worlds will die. And the universe will never be the same." This is the infamous tagline for the Crisis on Infinite Earths comic book event.

In the comics, of course, Psycho Pirate was a critical part of the multiverse-altering Crisis on Infinite Earths comic series. The seminal comic book event series saw the multiverse come under attack by the Anti-Monitor, who sought to destroy all life. To combat this threat, the Monitor assembled the greatest heroes and villains from each world to fight back. By the time the Anti-Monitor reached Earth-1, only five worlds remained. Under the Monitor's guidance, the metahumans of all five Earths banned together and overcame the Anti-Monitor -- but not without some causalities. Crisis on Infinite Earths is also remembered for the deaths of Barry Allen and Kara Zor-El, as was teased in the final episode of "Elseworlds."

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Notably, Crisis on Infinite Earths also merged the remaining Earths together. If The CW's "Crisis on Infinite Earths" follows the source material closely, that could mean Supergirl will ultimately join the Arrowverse proper with Arrow, The Flash and DC's Legends of Tomorrow. For now, her world -- known as Earth-38 -- remains separate.

The Flash returns from its winter hiatus on Tuesday, January 15, with Supergirl coming back on Sunday, January 20 and Arrow on Monday, January 21.