"The Flash" executive producer Andrew Kreisberg recently said of the follow-up plot of Danielle Panabek's "Frost Killer", "It is obvious that Danielle Panabek will not leave the crew, but in the fourth season, whether she will continue to appear as "Frost Killer", or will she be able to restore Caitlin's identity, or she will become another version of "Frost Killer". These doubtful viewers will only know if they watch the fourth season. (Blah Blah a whole bunch, equivalent to saying nothing).)
Danielle Panabeck plays Caitlin
Previously, Danielle Panabeck had said in an interview, "I don't know if the audience will ever see Caitlin again, but in Episode 21 the audience will see Caitlin and the Frost Killer coexist in the same body and enjoy the same memories." The things Caitlin can remember, the Frost Killer is also fully aware of, and the question becomes more like the Frost Killer's choice of who she is going to be and how she's going to treat Caitlin's memories. So I think it's quite a dilemma for Caitlin, for both caitlin and for the people on the Flash team, to watch the Frost Killer do evil in Caitlin's appearance. ”
Danielle Panabeck also said that in the season-final episode of The Flash, her character will have more scenes than in previous season-final episodes, and there will be a "bigger and more exciting battle" in the season-final episode.