It seems like it's been an eternity getting Stephen King's iconic series, The Dark Tower, to the big screen. Finally, though, the film has a release date and a trailer, and even more cast members have been added to the roster. Previously, Stephen King announced the first two stars on his Twitter account. In a cryptic tweet about the project, the horror master said, "It's official: The man in black fled across the desert and the gunslinger followed." He also tagged Matthew McConaughey and Idris Elba, insinuating that they'd been locked into the production. Elba and McConaughey quickly jumped in on the Twitter conversation, thereby confirming their involvement in the film and who exactly they'd play. Keep reading for the full rundown of cast members, and get excited: this is sure to be a wild ride.