Sony Pictures has released a new featurette for the upcoming “The Dark Tower,” including interviews with stars Idris Elba, Matthew McConaughey and creator Stephen King.

King’s ambitious “The Dark Tower” stars Elba as Roland Deschain, The Gunslinger, and Matthew McConaughey as Walter O’Dim (AKA Randall Flagg, The Man in Black, in the novels). The film is being directed by Nikolaj Arcel.

“The Dark Tower” series tells the story of Deschain, Mid-World’s last gunslinger, who is traveling southeast across Mid-World’s post-apocalyptic landscape, searching for the powerful but elusive magical edifice known as The Dark Tower. Located in the fey region of End-World, amid a sea of singing red roses, the Dark Tower is the nexus point of the time-space continuum.  It is the heart of all worlds, but it is also under threat. Someone, or something, is using the evil technology of the Great Old Ones to destroy it.

The Dark Tower hits theaters on Aug. 4.