The Flash (2014– )
14 user 11 critic

I Know Who You Are 

Team Flash meets a scientist who may be the key to stopping Savitar, but is forced into a battle with Killer Frost.


Hanelle M. Culpepper (as Hanelle Culpepper)


Greg Berlanti (developed by), Andrew Kreisberg (developed by) | 5 more credits »

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Episode cast overview:
Grant Gustin ... Barry Allen / The Flash / Savitar
Candice Patton ... Iris West
Danielle Panabaker ... Killer Frost
Carlos Valdes ... Cisco Ramon / Vibe
Keiynan Lonsdale ... Wally West
Tom Cavanagh ... H.R. Wells
Jesse L. Martin ... Joe West
Tom Felton ... Julian Albert
Anne Dudek ... Tracy Brand
Danielle Nicolet ... Cecille Horton
Andre Tricoteux ... Savitar


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. Written by sarah_l91

Plot Summary | Add Synopsis


TV-PG | See all certifications »






Release Date:

2 May 2017 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

16:9 HD
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Did You Know?


The building used to represent the exterior of the college where Team Flash finds Tracy Brand (Anne Dudek) is Thompson Hall, at the University of New Hampshire, which mostly houses administrative offices. See more »


Tracy Brand: The sketch artist was, like, freaking Michelangelo. And you've got your woman.
Joe West: No, not yet. And until we do, you could be in a lot of danger.
Tracy Brand: You really think Jack Frost's sister wants to kill me? I'm no one.
Joe West: In my experience, if she's come after you once, she's likely to do it again.
See more »


References Terminator 2: Judgment Day (1991) See more »

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User Reviews

flash big reveal
3 May 2017 | by mido_zzSee all my reviews

killer frost was so good and strong but she couldn't carry the ep alone as the ep was almost a filler but was great.

Thinking wally ,HR even ronney being savitar isn't reasonable at all it is just makes no sense at all specially ronney who sacrificed himself to help barry in season 1 so why would he want revenge ?!!

if you looked at it reverse flash hate barry because he sees him as a villain " who is the villain know flash ?" savitar sees him selfless and evil and it is for good reasons

that reveal was predicted but was necessary and it was too good that they make us think of someone as ronney or wally or hr and didn't focus on barry only " agree that writers could have done better this season even could added clues to make you think more about other characters "

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