INSIDIOUS: CHAPTER 3 Full Trailer and Poster The full trailer and poster for INSIDIOUS: CHAPTER 3 (in theaters June 5, 2015) has arrived. The prequel is directed by Leigh Whannell, who co-wrote and co-stared in the first two chapters of the horror saga. This third installment has Dermot Mulroney, Stefanie Scott, Lin Shaye, Angus Sampson, and Whannell himself battling an evil entity. “The newest chapter in the terrifying horror series is written and directed by franchise co-creator Leigh Whannell. This chilling prequel, set before the haunting of the Lambert family, reveals how gifted psychic Elise Rainier (Lin Shaye) reluctantly agrees to use her ability to contact the dead in order to help a teenage girl (Stefanie Scott) who has been targeted by a dangerous supernatural entity.”