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 Alexie Gilmore Rachel Farrow Guest Star Emrhys Cooper Young Greer Guest Star Michael Siberry Blackwood Guest Star Roman Blat Oleg Luski Guest Star Oakes Fegley Gabriel Hayward Guest Star Rafael Poueriet SWAT Team Officer 1 Guest Star Veronica Reyes-How Arguing Girlfriend Guest Star Andrew Fitzsimons London Stock Floor Manager Guest Star Daniel Keith Isaac 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 Michael Offer Director