Arrow EP Marc Guggenheim revealed at a Monday press event that The Flash castmembers Danielle Panabaker (Shark, Necessary Roughness) and Carlos Valdes (from Broadway’s Once) both will guest-star in Episode 19 of the CW’s hit sophomore drama.
Panabaker on the spin-off pilot plays Caitlin Snow, a bioengineering expert who lost her fiancé during the particle accelerator snafu at Central City’s S.T.A.R. Labs. (The smart money has her one day evolving into Killer Frost.) Valdes Carlos Valdesmeanwhile plays Cisco Ramon, S.T.A.R. Labs’ youngest genius (who may be fated to become the Justice Leaguer known as Vibe).