The latest episode of The Flash drops a reference to the first major Arrowverse crossover, "Invasion!"
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When Nash recruits Barry and Cisco to steal the cryptocircuit, he explains that the technology came from the Dominators.
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It was appropriated during "some invasion".
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This a reference to "Invasion!", a storyline which encompasses Flash Arrow, Legends of Tomorrow, and included Supergirl as one of the main characters.
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The event involved the Arrowverse's heroes going up against alien invaders called the Dominators.
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The 2016 crossover was a huge moment for the Arrowverse, because the number of superheroes included was unprecedented for a live-action DC Comics show.
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But as big as it was, it can hardly compare to what the Arrowverse has planned in "Crisis on Infinite Earths".
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