'Twilite,' Part 1. It's love at first bite when two new students arrive in Riverdale. Betty and Veronica feel a frisson of fascination by the smoldering-hot Ivan, but Jarred is warning everyone who'll listen that Ivan is really a vampire! Reggie volunteers to help Jarred expose Ivan as a bloodsucker, but love, or maybe Ivan, is clouding the girls' judgment. Can the girls be saved before romance sinks its teeth in?