Supergirl's Elseworlds Stinger Reveals What Happened to 90s Flash's World

SPOILER WARNING: This article contains major spoilers for "Bunker Hill," the latest episode of Supergirl.

In The CW's full trailer for the Arrowverse's upcoming three-show crossover "Elseworlds," John Wesley Shipp's Flash has a major piece of dialogue: "You will not do to this Earth what you did to mine." Now, we know exactly what happened to that world.

The end of "Bunker Hill," the latest episode of Supergirl, jumped to Earth-90 for a moment to show the world of Shipp's Flash in utter ruins. The very ground was churned up, as if something had crash landed into it at a high speed. Heroes' bodies lay scattered throughout the ruins; a few recognizable figures included Stargirl, Firestorm, Captain Cold, the Hawks and what looked to be a Green Arrow wearing Smallville's version of the costume.

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Even so, Shipp's Flash managed to claw his way out of the wreckage towards a leather-bound book. Before he reached it, though, a figure stepped into frame and grabbed it first. When the shot pulled back, it revealed the Monitor, who looked down at Flash in disgust. "You failed," he barked.

"Why are you doing this?" Flash demanded, to which the Monitor replied, "You did this to yourselves, and now all of you will perish." At that, the Monitor cracked open the book, which emitted a beam of white light.

Flash didn't need to be told twice. He leapt to his feet and sped off, running right towards the camera, which focused on the emblem of his costume before cutting to black. Though the episode didn't show where he ended up, the photos and promos for "Elseworlds" reveal he will eventually make his way to Earth-1.

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The moniker Earth-90 is likely a reference to Shipp's tenure as the Scarlet Speedster. Shipp, of course, played Barry Allen in CBS' The Flash series from the 1990s. Last month, he was confirmed to reprise the role in "Elseworlds."

This year's Arrowverse crossover event will involve the casts of Supergirl, Arrow and The Flash. The event will unfold over three nights, starting with a special episode of The Flash on Sunday December 9 at 8 pm ET/PT. Then, it continues Monday, December 10, with Arrow, and concludes on Tuesday, December 11, with Supergirl.

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