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 John Nolan John Greer Guest Star Camryn Manheim Control Guest Star Annie Ilonzeh Harper Rose Guest Star Winston Duke Dominic Guest Star Jamie Hector Link Cordell Guest Star Cara Buono Martine Rousseau Guest Star John Preston Admitting Physician Guest Star Juan-Pablo Veiza Tyler Guest Star Radu Spinghel Lenny Guest Star Erin Dilly Shelly Spencer Guest Star Bjorn Dupaty Garvin Guest Star Jack Ferry Head Sentry Guest Star Joe Curnutte Samaritan Operative 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 Denise Thé Writer Frederick E.O. Toye Director