The official trailer for Black Mass, the upcoming movie about Irish mobster “Whitey” Bulger, has been released. The clip shows Johnny Depp completely transformed into the ruthless and menacing Bulger.

The film, directed by Scott Cooper, is set in 1970s South Boston and tells the true story of how the FBI asked Bulger to collaborate with them in an effort to eliminate the Italian mob — an alliance “which spiraled out of control, allowing Whitey to evade law enforcement, consolidate power, and become one of the most ruthless and powerful gangsters in Boston history.”

Benedict Cumberbatch, Joel Edgerton, Kevin Bacon, Peter Sarsgaard, Sienna Miller, and Dakota Johnson also star. 

The film will be released in theaters on September 18.

Watch the trailer below: