VIDEO: Mark Rylance, Kenneth Branagh Star in Christopher Nolan's DUNKIRK

Christopher Nolan ("Interstellar," "Inception," "The Dark Knight" Trilogy) directs the epic action thriller DUNKIRK, from his own original screenplay. The film will hit theaters July 21, 2017 from Warner Bros. Check out the first trailer below!

"Dunkirk" opens as hundreds of thousands of British and Allied troops are surrounded by enemy forces. Trapped on the beach with their backs to the sea they face an impossible situation as the enemy closes in.

"Dunkirk" features a prestigious cast, including Tom Hardy ("The Revenant," "Mad Max: Fury Road," "Inception"), Mark Rylance ("Bridge of Spies," "Wolf Hall"), Kenneth Branagh ("My Week with Marilyn," "Hamlet," "Henry V") and Cillian Murphy ("Inception," "The Dark Knight" Trilogy), as well as newcomer Fionn Whitehead. The ensemble cast also includes Aneurin Barnard, Harry Styles, James D'Arcy, Jack Lowden, Barry Keoghan and Tom Glynn-Carney.

The film is being produced by Nolan and Emma Thomas ("Interstellar," "Inception," "The Dark Knight" Trilogy). Jake Myers ("The Revenant," "Interstellar," "Jack Reacher") is serving as executive producer.