Sinopsis:

Wealthy businessman Hiram Lodge announces his plan to turn Riverdale's Sweetwater Swamp into a tuition-free university. In Gotham City, Poison Ivy is enraged by the news as the swamp is home to dozens of rare plants. She convinces her friend and fellow criminal Harley Quinn to help her stop the Sweetwater project. The pair travel to Riverdale, and when they are not able to talk Hiram out of it, they decide that more drastic measures are required. That night, Harley and Ivy crash a costumed gala hosted by Hiram. Hiram's daughter Veronica Lodge and her friend Betty Cooper are also in attendance.[19] Ivy and Harley cause trouble at the gala, first when Harley knocks out Reggie Mantle who is dressed as the Joker, then when they attempt to kidnap Veronica. Betty comes to Veronica's aid and the four of them get into a fight. Zatanna and Sabrina Spellman, who were hired as stage magicians, cast