The "Red Oaks" and "How to Make it in America" actress' casting as Gladys Jones in the small-screen, comic-book adaptation was announced Sunday at New York Comic Con where the cast participated in a panel discussion in front of thousands of fans.
Trinity Likins will play Jughead's little sister, Jellybean, starting this season, as well.
Luke Perry, who plays Fred Andrews, said Gershon's first scenes are with Sprouse, Ulrich and KJ Apa, who plays Fred's son Archie.
"And Gina can handle all them," EW.com quoted Perry as saying. "She's fun."
"Riverdale" creator Roberto Aguirre Sacasa shared a photo Sunday of Apa, Perry, Lili Reinhart (Betty Cooper) and Madchen Amick (Betty's mom Alice) sitting on a couch at the Javits Center in Manhattan where NYCC took place.
"Having a blast with the Cooper ladies and the Andrews boys at NYComic-Con. They make me so happy! #Riverdale is back in three days!!" he tweeted.
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