The Flash backdrop
The Flash S3E20 — I Know Who You Are
8.8
The Flash•Season 3•Episode 20

I Know Who You Are

8.8/10 · 5,131 votesMay 2, 201742 min

Ranked #3 of 23 in Season 3•+0.7 vs season avg

Discussion

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

Directed byHanelle M. Culpepper
Written byJoshua V. Gilbert, Bronwen Clark
Previous episodeE19 · The Once and Future FlashNext episodeE21 · Cause and Effect
BestEpisodes
WorstEpisodes
BestSeasons
AllEpisodes

Seasons9

All123456789

Season 3 Episodes23

Flashpoint stillE1 8.3

Flashpoint

Paradox stillE2 8.3

Paradox

Magenta stillE3 7.5

Magenta

The New Rogues stillE4 8.0

The New Rogues

Monster stillE5 7.4

Monster

Shade stillE6 8.3

Shade

Killer Frost stillE7 8.6

Killer Frost

Invasion! (II) stillE8 9.0

Invasion! (II)

The Present stillE9 8.7

The Present

Borrowing Problems from the Future stillE10 7.9

Borrowing Problems from the Future

Dead or Alive stillE11 7.8

Dead or Alive

Untouchable stillE12 7.7

Untouchable

Attack on Gorilla City (1) stillE13 7.8

Attack on Gorilla City (1)

Attack on Central City (2) stillE14 7.7

Attack on Central City (2)

The Wrath of Savitar stillE15 8.5

The Wrath of Savitar

Into the Speed Force stillE16 7.8

Into the Speed Force

Duet (II) stillE17 6.2

Duet (II)

Abra Kadabra stillE18 7.9

Abra Kadabra

The Once and Future Flash stillE19 8.6

The Once and Future Flash

I Know Who You Are stillE20 8.8Now viewing

I Know Who You Are

Cause and Effect stillE21 8.0

Cause and Effect

Infantino Street stillE22 9.0

Infantino Street

Finish Line stillE23 7.7

Finish Line

Cast8

Grant Gustin

Grant Gustin

Barry Allen / The Flash

Danielle Panabaker

Danielle Panabaker

Dr. Caitlin Snow / Killer Frost

Carlos Valdes

Carlos Valdes

Cisco Ramon / Vibe

Keiynan Lonsdale

Keiynan Lonsdale

Wally West / Kid Flash

Tom Cavanagh

Tom Cavanagh

Harrison 'H.R.' Wells

Jesse L. Martin

Jesse L. Martin

Joe West

Tom Felton

Tom Felton

Dr. Julian Albert

Candice Patton

Candice Patton

Iris West

Crew5

Hanelle M. Culpepper

Hanelle M. Culpepper

Director

Joshua V. Gilbert

Joshua V. Gilbert

Writer

B

Bronwen Clark

Writer

S

Stewart Whelan

Director of Photography

A

Andrew Wilder

Co-Executive Producer

Discussion

0 comments

Join the conversation

Share your take and reply to other fans.

No comments yet

Be the first to share your thoughts on this episode.

Episode Summary

"I Know Who You Are" is episode 20 of The Flash season 3. It scored 8.8/10 from 5,131 votes, ranking #3 of 23 episodes this season (season average 8.1). Directed by Hanelle M. Culpepper and written by Joshua V. Gilbert, Bronwen Clark, it aired on May 2, 2017.

Next: E21 · Cause and EffectBest of Season 3