Sound of My Voice is a 2011 American psychological thriller directed by Zal Batmanglij and starring Christopher Denham, Nicole Vicius and Brit Marling. The plot focuses on two documentary filmmakers who attempt to expose a cult led by a charismatic leader (Marling) who claims to be from the future. The film was written by Batmanglij and Marling. It premiered at the 2011 Sundance Film Festival. It was also selected to close the 2011 SXSW Film Festival.