Cicada II is on the move, and it's up to Team Flash to stop them.

The Flash episode 521, "The Girl With The Red Lightning," will also see Iris and Barry once again trying to work things out with Nora.

CICADA II MAKES HER MOVE -- Team Flash is on high alert after Cicada II (guest star Sarah Carter) threatens to unleash a dangerous virus that would put all meta-humans at risk.

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The Flash episode 521 airs on May 7, 2019.

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