The Flash (2014) (2014)
S03E21 Cause and Effect
Episode Overview
Title: Consequences Plot: In a bold move to thwart Savitar, Barry resorts to extreme tactics. At the same time, H.R. persistently encourages Tracy Brand to create a device intended to ensnare Savitar. As events unfold, Killer Frost makes her return, bringing with her a surprising offer that could change everything.
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S03