New INSIDIOUS: CHAPTER 3 Clips and TV Spots Experience the new INSIDIOUS: CHAPTER 3 clips and TV spots! The horror prequel, directed by Leigh Whannell, stars Dermot Mulroney, Stefanie Scott, Lin Shaye, Angus Sampson, and Leigh Whannell. INSIDIOUS: CHAPTER 3 will be released in theaters on June 5. A prequel set before the haunting of the Lambert family that reveals how gifted psychic Elise Rainier reluctantly agrees to use her ability to contact the dead in order to help a teenage girl who has been targeted by a dangerous supernatural entity.