Barry and Iris relive the same day over and over again; Joe has a heart-to-heart with Cecile; friends and foes, old and new, begin to descend upon Central City.
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Barry feels guilty for what happened to Caitlin; Mark comes up with a plan that makes everyone skeptical; Red Death looms in Central City and commands that failure is not an option; old friends pay an unexpected visit to S.T.A.R. Labs.
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Barry and Iris start to put together the pieces of what's happening in Central City and believe they know what the Rogues are after; the team recruits some unlikely allies to help; Allegra does her best to avoid having a conversation with Chester.
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The Flash is forced to make an impossible choice; with the power out in the city, Team Flash calls upon the Rogue Squad to help; Iris is visited by an old friend; Joe and Cecile work on finding a balance.
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As the Red Death wreaks havoc on Central City, Barry and Iris come up with a plan and turn to Cecile for help; Barry is faced with what he thinks was his greatest mistake; Joe gives Barry a needed pep talk.
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Barry and Iris prepare for their new life; Cecile takes on a case involving a string of unfortunate and highly unexpected events; Chester and the team work with Khione to figure out her abilities.
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Iris and Nia fall into a fever dream and explore different possibilities for their lives; Barry, Chester, Allegra and Cecile desperately try to help them; Khione feels that Mark is trying to make her something she is not.
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A seemingly simple mold inspection at S.T.A.R. Labs leads to unexpected time anomalies; Chester admits a secret to Allegra, which makes things awkward between the two; Khione meets with an old friend of Team Flash.
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Team Flash throws a surprise birthday party for Barry, but things go terribly awry when Ramsey Rosso crashes the festivities.
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As Iris receives word of a career milestone, Barry is suddenly nowhere to be found; Barry runs across many familiar faces; Khione continues to figure out her powers; Chester works on a suit for Allegra.
