On Tuesday April 21 at their CinemaCon panel, Warner Bros. premiered the first trailer for their upcoming Whitey Bulger biopic Black Mass.

The film, in theaters September 18, features Johnny Depp as the Boston gangster-turned-informant. Depp disappears into the role, almost unrecognizable. The film chronicles mobster Whitey Bulger’s rule over Boston as the head of the Irish mob, and go through the story of Bulger’s becoming an informant for the FBI to take down the Italian mafia – leading to drugs, murder, and ultimately Bulger becoming one of the FBI’s most wanted men.

Black Mass, directed by Scott Cooper, enters theaters on September 18, 2015. Will you watch? (You should). To help you decide, you can watch the Black Mass trailer, courtesy of MOVIECLIPS Trailers’ YouTube page, below: