[Warning: The following contains spoilers for the Arrow Season 7 finale. Read at your own risk!]

The yearly Arrowverse crossover event has become a staple of The CW, but this year is going to be a particularly epic one since it will be the last to incorporate Arrow, the flagship show of the franchise.

Arrow's final season will include the 2019 crossover, Crisis on Infinite Earths, and though it's still very early days, we have a few teases about what's to come thanks to the hints and spoilers dropped here and there in Arrow, Supergirl, and The Flash, as well as in last year's Elseworlds crossover. Here is everything we know so far about the epic TV event.

All five Arrowverse shows will take part. Yep, you read that right. Crisis will be a five-part crossover event with Arrow, Supergirl, The Flash, DC's Legends of Tomorrow, and newcomer Batwoman all airing episodes.

It will begin this fall. The Arrowverse crossover event has historically aired in the fall, usually in late November or early December. At the CW's Upfront presentation, network president Mark Pedowitz confirmed Crisis on Infinite Earths would kick off in December but conclude after the midseason break. Three of the five episodes will air before the year's end, and the other two will then follow in 2020. One of the episodes is confirmed to be the DC's Legends of Tomorrow hour, which premieres at midseason.

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Oliver Queen (Stephen Amell) will die to save the multi-verse. In the Arrow Season 7 finale, we finally discovered the price of the deal Oliver made with the Monitor (LaMonica Garrett) in Elseworlds. He told Oliver that the crisis would claim his life, and in Arrow's flash-forwards, we saw Oliver's headstone with his death dated in 2019.

Stephen Amell and Emily Bett Rickards, <em>Arrow</em>Stephen Amell and Emily Bett Rickards, Arrow

It could potentially serve as the Arrow series finale. Beyond the fact that Oliver will apparently die in the coming crisis, we know Arrow's final season will only consist of 10 episodes, meaning it probably won't continue into 2020. That leaves us with the possibility that Arrow's series finale will actually take part in the fall episodes of the crossover, effectively putting an end to Oliver Queen's story.

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We'll learn about Barry's (Grant Gustin) mysterious disappearance in the future. In The Flash pilot, a headline from the future revealed the Flash vanishes in a "crisis," but we don't know much beyond that. Executive producer Todd Helbing revealed we may finally get some answers about Barry's disappearance in Crisis on Infinite Earths.

"We've certainly been teasing [the headline] a long time, but it's a major factor in next year's crossover," Helbing said.

This seemed to be confirmed again with The Flash's Season 5 finale, which saw the future headline change its date from 2024 down to 2019 in the final bonus scene.

<em>The Flash</em>The Flash

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