Michael J. Burg

In the fourth season premiere, the team must devise new ways to continue their work without being detected by Samaritan after they're forced to take on new identities created by Root. Some, however, find it hard to ignore the Machine's numbers, putting them all at risk of being seen by the rival machine.

Reese and Finch are caught in a power struggle for control of the city's gangs when Elias (recurring guest star Enrico Colantoni) is targeted by Dominic (recurring guest star Winston Duke), the ambitious leader of the Brotherhood. Meanwhile, Root and Shaw disagree over how to handle a new threat from Samaritan.

While Gordon seeks information about the recent controversy with Commissioner Loeb, Fish's allegiance with the prisoners is questioned when she appears to join forces with Dr. Dulmacher (guest star COLM FEORE). Meanwhile, after an attack close to home, Bruce deals with the aftermath.

In an effort to expose the Blue Templar, Frank decides not to report a drug bust case that reveals dirty cops.

Stone is thrust into the spotlight as a controversy involving the defense emerges.