Justice League Mortal (2009)
Back in 2009, DC were forced to abandon plans for the first ever Justice League movie due to the Hollywood Writers’ Strike. Called Justice League Mortal, it would have been directed by Mad Max director George Miller. The cast would have included D.J. Cotrona as Superman, Armie Hammer as Batman, Megan Gale as Wonder Woman, Common as Green Lantern, Santiago Cabrera as Aquaman and Hugh Keays-Byrne as Martian Manhunter. Adam Brody would have featured as Barry Allen/The Flash, who would have been the film’s protagonist.
The Flash (2014 -)
The most famous adaptation of The Flash to modern viewers is The CW’s smash hit The Flash TV series. Grant Gustin stars as Barry Allen, the Fastest Man Alive, as he protects Central City from metahuman threats. The show was preceded by a Gustin’s multi-episode guest spot on Arrow before landing his own series. The Flash is currently on its third season. It notably features former Flash John Wesley Shipp as another version of the speedster, Jay Garrick.
The LEGO Movie (2014)
Unlike his fellow Justice Leaguers Batman, Superman, Green Lantern and Wonder Woman, The Flash does not feature in a speaking role in The LEGO Movie. However, it does mark his cinematic debut, so his cameo in the movie is a small but significant one.
DC Extended Universe (2016 – )
As of 2016, Ezra Miller plays Barry Allen/The Flash in the ongoing movie franchise known as the DC Extended Universe. Miller cameod in Batman v Superman: Dawn of Justice, before being revealed in costume for the first time in Suicide Squad. He will appear in his first major role in 2017’s Justice League. A solo movie for the character is currently in limbo, but hopefully it will materialize out of the Speed Force at some point.