"I Know Who You Are" - (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV) VIBE FACES OFF AGAINST KILLER FROST - Barry (Grant Gustin) and the team meet Tracy Brand (guest star Anne Dudek), a scientist, who may be the key to stopping Savitar. Unfortunately, Killer Frost (Danielle Panabaker) is also after Tracy so Team Flash must battle their old friend, which proves to be particularly difficult for Cisco (Carlos Valdes). Joe (Jesse L. Martin) and Cecile's (guest star Danielle Nicolet) relationship takes a big turn. Hanelle Culpepper directed the episode written by Bronwen Clark & Joshua V. Gilbert (#320). Original airdate 5/2/2017.
Blinded by anger, Barry unwittingly plays into Zoom's game and uncovers the evil speedster's true goal: to destroy all the earths in the multiverse. In the face of his life, Barry ultimately gets the upper hand against Zoom and defeats his nemesis. But unable to celebrate victory, Barry makes a world-shaking decision and speeds back in time to the night his mother died to stop Reverse Flash from killing her, irrevocably changing his past and redetermining his future.
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