The theme of this year’s crossover event has been revealed! The four-part crossover is entitled Crisis on Earth-X, and features all the superheroes coming to town to attend Barry and Iris’ wedding. However, villains from Earth-X crash the festivities with a deadly agenda. Production for the crossover event has begun today!
Crisis on Earth-X, the 4-part crossover event, begins November 27 on The CW! pic.twitter.com/hRGK8bumZd
— The Flash (@CW_TheFlash) September 22, 2017