The Flash S5E21: The Girl with the Red Lightning – Penultimate Peril

The episode's title refers to (Jessica Parker Kennedy) and her deteriorating connection to the Negative Speed Force.

As The Flash Season 5 draws to a close, Episode 21, "," serves as a high-stakes bridge to the finale. This hour focuses on the dual threats of Cicada II’s genocidal plan and the dark, looming influence of Eobard Thawne over Nora West-Allen. A City Under Siege