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04/12/2018 The 100th episode of 'The Flash' airs on CW

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The Flash 5x08 Promo 100th Episode - Zoom vs Reverse Flash and Savitar Breakdown

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The Flash 5x08 Thawne, Nora, Barry "What's past is Prologue" Season 5 Episode 8 Scene

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The Flash 5x08 Zoom, Barry and Nora | Season 5 Episode 8

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"The Flash" Stars Tease 100th Episode With Rapid-Fire Questions | E! Red Carpet & Award Shows

"What's Past Is Prologue" is the eighth episode of the fifth season of the American television series The Flash, based on the DC Comics character Barry Allen / Flas. The episode was written by Todd Helbing and Lauren Certo, directed by Tom Cavanagh, and is the series' 100th episode.