When Barry suddenly gains the power of speed thinking, he attempts to use his new gift to save Iris. While Barry is thrilled with his new power, Cisco is hesitant to trust it. Meanwhile, Eva must face a shattering truth.
Quest roles:
Carlos Valdes(Cisco Ramon), Tom Cavanagh(Harrison 'Nash' Wells), Victoria Park(Mirror Kamilla Hwang), Efrat Dor(Eva McCulloch / Mirror Monarch), Patrick Sabongui(Mirror Chief David Singh), Natalie Sharp(Millie Rawlins / Sunshine), Morena Baccarin(Gideon (voice) (uncredited)), Matt Letscher(Eobard Thawne / Reverse-Flash), Stephanie Izsak(Officer Daisy Korber), Jessica Hayles(Arielle Atkins)