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 Julian Ovenden Jeremy Lambert Guest Star Cara Buono Martine Rousseau Guest Star Chester Jones III Monty Guest Star Mark Gessner Gary Guest Star Andy English Harvey Guest Star Brennan Taylor Investment Banker Guest Star Alexis Suarez Janitor 2 Guest Star Chris LaPanta Kenneth Guest Star Victor Joel Ortiz Bomb Squad Cop Guest Star Greg McFadden Businessman Guest Star Tuffy Questell Guard Guest Star Charles Techman Old Man Guest Star Gameela Wright Single Mom Guest Star Rebecca White Onlooker 1 Guest Star J.J. Abrams Executive Producer Bryan Burk Executive Producer Jonathan Nolan Executive Producer David Semel Executive Producer Greg Plageman Executive Producer Denise Thé Writer Chris Fisher Director