- "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
|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.|
- Grant Gustin as Barry Allen/The Flash/Savitar
- Candice Patton as Iris West
- Danielle Panabaker as Killer Frost
- Carlos Valdes as Cisco Ramon/Vibe
- Keiynan Lonsdale as Wally West
- Tom Cavanagh as H.R. Wells
- Jesse L. Martin as Detective Joe West
Special appearance by
- H.R. refers to Julian as "Romeo and Juliet" after he expresses concern over Caitlin. This is a reference to the romantic tragedy by William Shakespeare.
- Dr. Hersch is mentioned to be a faculty member at Central City University. In the comics, David Hersch is the civilian identity of Cicada, an enemy of The Flash and a cult leader.
- Tracy likens herself to Sarah Connor from the 1984 film The Terminator. Cisco and H.R. disagree, comparing her instead to Miles Dyson.
- Tracy refers to Killer Frost as "Jack Frost's sister" and "the White Witch", a reference to the villainess from the Chronicles of Narnia series.
- Tracy's favorite drink at CC Jitters is a secret item called "Zoom."
- Killer Frost's line, "more fun to reign in Hell" is a variation on the line "Better to reign in hell than serve in Heaven" from John Milton's epic poem "Paradise Lost".
- The building used to represent the exterior of CCU is Thompson Hall at the University of New Hampshire, which mostly houses administrative offices.
- This is the first time that Killer Frost uses her "Ice Slide", a construct that she uses all the time in the comics, to move through the city.
- 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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