The true story of Whitey Bulger, the brother of a state senator and the most infamous violent criminal in the history of South Boston, who became an FBI informant to take down a Mafia family invading his turf. Starring Dakota Johnson, Johnny Depp, Benedict Cumberbatch, Joel Edgerton, Juno Temple and Kevin Bacon star in the second full trailer and third preview of 'Black Mass' in HD. Courtesy Warner Bros.