Bacon will play FBI Special Agent Charles McGuire, Deadline reports, who will no doubt have some interest in Depp’s character Whitey Bulger, who plays Cumberbatch’s on-screen mischievous brother.
The film charts the real life story of the two men as William Bulger (Cumberbatch) built up a career as a politician, claiming to be oblivious to his brother Whitey’s criminal activity, a man said to be both breaking the law and informing on those that did.
Depp is barely recognisable on set, with a receding hairline, glasses and leather jacket get up. Cumberbatch dons a more demure suit and tie ensemble.
The film certainly boasts a Hollywood-heavy cast, with Sienna Miller and the soon-to-be star of Fifty Shades of Grey Dakota Johnson among the stars.