Crisis On Earth-X – the historic, four-part crossover event between Supergirl, Arrow, The Flash and Legends of Tomorrow – almost saw release as a feature-length film.
Thankfully, all four parts of the Crisis On Earth X crossover event can still be streamed for free on The CW website at the moment.
Marc Guggenheim revealed (via his Twitter account) that Crisis On Earth X almost was released as a seamless film.
The crossover event was praised by critics and fans alike, with many saying Crisis on Earth X was a better Justice League movie than Justice League.