A movie based on Canada's most notorious female serial killer will receive its world premiere next month at the Montreal World Film Festival. Laura Prepon ("That '70s Show") stars in "Karla" as Karla Homolka, who teamed up in 1993 with her husband, Paul Bernardo, to torture and murder two schoolgirls in a case that gathered international attention because the attacks were recorded on video, which was shown in court. Homolka also helped Bernardo rape and murder her own sister. Misha Collins ("24") will play Bernardo. Joel Bender will direct. Etan Vlessing reports in Reuters.