Spoilers for The Flash Season 3, Episode 20 “I Know Who You Are” in this review and recap.

Official Synopsis:

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.

16 hours earlier
Still inexplicably Killer Frost; Barry uses his brain skillz!
HR’s got game
Julian’s been a good guy lately, but everyone is mean to him
Joe and Cecile
Caitlin has learned some tricks with her ice
Cisco and Julian
My book on motivational speaking “all’s Wells that ends Wells”
Barry has a plan
Vibe vs. Killer Frost
Another person to hang out in Star Labs!
Savitar is revealed

Next Week’s episode preview: 5/9 “Cause and Effect” Trailer - Let’s erase Barry’s memories

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