Cast

• Benedict Cumberbatch — Billy Bulger
• Bates Wilder — Agent James
• Jeremy Strong — Josh Bond
• Joel Edgerton — John Connolly
• David Harbour — John Morris
• Adam Scott — FBI Agent Robert Fitzpatrick
• Juno Temple — Deborah Hussey
• Jamie Donnelly — Mrs. Cody
• Declan Mulvey — Charlie's Friend
• Johnny Depp — James 'Whitey' Bulger
• Dakota Johnson — Lindsey Cyr
• Kevin Bacon — FBI Agent Charles McGuire
• Peter Sarsgaard — Brian Halloran
• Jesse Plemons — Kevin Weeks
• Corey Stoll — Fred Wyshak
• Julianne Nicholson — Marianne Connolly
• W. Earl Brown — John Martorano
• Bill Camp — John Callahan
• Mark Mahoney — Mickey Maloney
• Brad Carter — John McIntyre
• Lonnie Farmer — DEA Agent Eric Olsen (Interrogator)
• Owen Burke — Buddy Leonard
• Gary Galone — State Captain
• Rory Cochrane — Stephen Flemmi
• James Russo — Agent Scott Gariola
• David Conley — Officer Flynn
• Ciaran Crawford — Irish Nationalist
• Thomas Philip O'Neill — FBI Wire Tech
• Anthony Molinari — Charlie McTiernan
• Todd Ryan Jones — Charlie's Friend
• Richard Donelly — Gerard O'Neill
• Peter Morse — FBI Agent
• Tom Kemp — Father Mackey