According to the "Hollywood Reporter," Castillo will be playing a visiting music professor named Oscar who will make his debut in the show's fifth episode.
The launch of the CW show is set to roughly coincide with the 75th anniversary of the "Archie" comics and will provide an edgier updating of the classic all-ages characters. The network bills it as “a surprising and subversive take on Archie, Betty, Veronica, and their friends," that explores "the surrealism of small town life [and] the darkness and weirdness bubbling beneath Riverdale’s wholesome facade."
With this series description in mind, it's possible that Castillo's "Riverdale" character might have more in common with his "Gotham" counterpart than one might first have imagined.
Starring K.J. Apa as Archie Andrews, "Riverdale" will debut mid-season on The CW. The series also stars Cole Sprouse as Jughead Jones, Camila Mendes as Veronica Lodge, Lili Reinhart as Betty Cooper, Ross Butler as Reggie Mantle and more.