3x20 I Know Who You Are
First Aired: May. 02, 2017 on The CW
Summary: Barry and the team meet Tracy Brand, a scientist, who may be the key to stopping Savitar. Unfortunately, Killer Frost is also after Tracy so Team Flash must battle their old friend, which proves to be particularly difficult for Cisco. Joe and Cecile’s relationship takes a big turn.
Guest Stars[no credits found]