Jim Caviezel John Reese Actor Michael Emerson Harold Finch Actor Kevin Chapman Lionel Fusco Actor Sarah Shahi Sameen Shaw Actor Amy Acker Root Actor John Nolan John Greer Guest Star John Doman Sen. Ross Garrison Guest Star Joseph Melendez Maneul Rivera Guest Star Diane Davis Madison Guest Star Marc Damon Johnson Jesse Brandt Guest Star Robbie Tann Niall Jacobs Guest Star Lisa Kron Jillian Wirth Guest Star Sebastian Maynard-Palmer Frankie Brandt Guest Star Kelly AuCoin AUSA Langdon Guest Star Adi Hanash Aziz Al-Ibrahim Guest Star De'Adre Aziza Shari Guest Star John Wernke Agent One Guest Star J.J. Abrams Executive Producer Bryan Burk Executive Producer Jonathan Nolan Executive Producer David Semel Executive Producer Greg Plageman Executive Producer Amanda Segel Writer Chris Fisher Director