Main cast •
Kevin Bacon as Ryan Hardy, a former
FBI agent (15 episodes) •
Shawn Ashmore as Mike Weston, a young FBI agent (15 episodes) •
Jessica Stroup as Max Hardy, a young FBI agent and Ryan Hardy's niece (15 episodes) •
Sam Underwood as Mark Gray, follower and son of deceased Lily Gray and identical twin of deceased Luke (9 episodes) •
Zuleikha Robinson as Gwen, love interest of Ryan Hardy (15 episodes) •
Gregg Henry as Dr. Arthur Strauss, Joe Carroll's mentor who introduced him into killing (4 episodes) •
Michael Ealy as Theo Noble (10 episodes) •
James Purefoy as Joe Carroll, a serial killer and cult leader on death row (9 episodes)
Recurring •
Ruth Kearney as Daisy (11 episodes) •
Gbenga Akinnagbe as Tom Reyes, Max's boyfriend (10 episodes) •
Monique Gabriela Curnen as Erin Sloan, an FBI tech analyst (10 episodes) •
Valerie Cruz as Agent Mendez, lead FBI agent (7 episodes) •
Diane Neal as FBI Agent Lisa Campbell (5 episodes) •
Hunter Parrish as Kyle (5 episodes) •
Megalyn Echikunwoke as Penny Tyler, Theo's sister (5 episodes) •
Mike Colter as Nick Donovan, a returning FBI agent who assumes command of the FBI team (3 episodes) •
Susan Kelechi Watson as Cindy Noble, Theo's wife (3 episodes) •
Annet Mahendru as Eliza (4 episodes)
Guest stars • Kristen Bush as Dawn McClane, Mendez's wife (3 episodes) •
Felix Solis as Agent Clarke, FBI Director (2 episodes) •
Michael Irby as Andrew, follower of Mark (2 episodes) •
Glenn Fleshler as Neil, former student of Dr. Strauss (2 episodes) •
Robin Weigert as Judge Wallace (2 episodes) •
Tim Guinee as Duncan Banks (2 episodes) •
David Furr as Tucker (2 episodes) •
Allison Mack as Hillary, a local police officer who assists the FBI (1 episode) •
David Pittu as Eldon (1 episode) ==Episodes==