Jim Caviezel John Reese Actor Michael Emerson Harold Finch Actor Kevin Chapman Lionel Fusco Actor Sarah Shahi Sameen Shaw Actor Amy Acker Root Actor Enrico Colantoni Carl Elias Guest Star Joshua Close Jeff Blackwell Guest Star James Le Gros Bruce Moran Guest Star Will Connolly Ethan Garvin Guest Star Julie Cavaliere Mary Mulhall Guest Star Peter Gray Lewis JD Carrick Guest Star Brit Whittle Benjamin Haas Guest Star Finnerty Steeves RTCC Supervisor Guest Star Jonathan Wilde RTCC Dispatch Guest Star Tyson Hall 4D Guest Star Romell Witherspoon Officer James Guest Star Daniel Morgan Shelley Amped Up Cop Guest Star Julian Rozzell Jr. Homeless Guy Guest Star J.J. Abrams Executive Producer Bryan Burk Executive Producer Jonathan Nolan Executive Producer David Semel Executive Producer Greg Plageman Executive Producer Andy Callahan Writer Maja Vrvilo Director