The Arrowverse season finales have all been essential setup for "Crisis on Infinite Earths."
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The Flash saw Eobard Thawne change time and move the Crisis forward to 2019...
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Erasing Flash's daughter Nora from the future as a tragic side-effect.
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In Arrow, Oliver Queen was recruited by the Monitor to save the Multiverse...
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With ominous warnings it would cost Green Arrow his life.
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The Monitor also recruited a future Felicity to stand at Oliver's side.
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In Supergirl, the Monitor brought Malefic J'onzz, brother of J'onn J'onzz, to Earth...
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And appeared to intend to resurrect Lex Luthor.
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Finally, the Monitor even made a blink-and-you'll-miss-it cameo in Legends of Tomorrow as well.
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It looks like it's full steam ahead for the Crisis!
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