The Flash follows the superhero based on the DC comic character. The film introduces Barry Allen, played by Ezra Miller. Allen is a crime scene investigator. He gets struck by lightning and gains superhuman speed.

Andy Muschietti directs the movie. The Argentine-born filmmaker directed horror films It and Mama. His unique visual style and handling of special effects helped him nab the helm of the major event in the DC Extended Universe (DCEU).

With his newfound powers, Barry is the Flash and uses his speed to safeguard Central City from multiple threats, including Doctor Alchemy, played by Michael Shannon.

Barry lives a double life as a superhero and a police officer. He works to undercover the truth about his powers and the mysterious forces behind him.

The cast includes Kiersey Clemons as Iris West, Billy Crudup as Henry Allen, Candice Patton as Iris West-Allen, Tom Cavanagh as Harrison Wells, Sasha Calle as Supergirl and Maribel Verdu as Rosalind Dillo.

The film spotlights cameo appearances by other DC characters, such as Wonder Woman and Batman, as part of the DCEU. Ben Affleck and Michael Keaton also star in The Flash.