(Douglas Smith & Matthew Shear): Detective brothers skilled in the new science of forensics who join the team.
(Brian Geraghty): The police commissioner who provides covert support for the investigation while trying to clean up police corruption. [S1E1] The Boy on the Bridge
(Daniel Brühl): A brilliant but intense psychologist dedicated to understanding the "alienated" minds of criminals. (Douglas Smith & Matthew Shear): Detective brothers skilled