"I know who you are."
"It's about time.
"Yes, it is. Everything with you is about time, isn't it? The past, the present, the future. You know all of it, right? And you know everything about me! About Joe! About Wally! And Iris! You know our strengths. You know our fears. You know how much we love each other, and you know how to use that love against us. All this time, we thought that we couldn't stop you because you were one step ahead, but that's not it! You don't just know what's gonna happen to us. You were there, you lived it, you remember... when you were me."
"Like I told you from the beginning... I am the Future Flash.
Barry and Savitar
"I Know Who You Are" is the twentieth episode of the third season of The Flash, and the sixty-sixth episode overall. It aired on May 2, 2017.


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 Cecille’s relationship takes a big turn.[src]



Special appearance by

Guest starring




  • At CCU, after Cisco takes the welder from Tracy, she removes her wielding helmet. However, in the next shot, Tracy is still wearing the helmet and takes it off after a couple seconds.




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