It all began when CBS decided to sell Supergirl to the CW network due to rising production costs. It increasingly became clear that a 4-night crossover event is within the realm of possibility. CW Chief Mark Pedowitz confirmed that there are plans of converging the storylines of not just Supergirl, Flash & Arrow but to include Legends of Tomorrow as well. He said that he has a tremendous amount of faith in CW universe and it will be the biggest crossover event ever. In fact, recently Stephen Amell shared a picture on his Instagram page which shows the boots of Flash, Green Arrow, Supergirl, Atom and White Canary, and he wrote: “Coming Soon”.
Marc Guggenheim (the executive producer) said: “It’s going to be an external threat that will involve Supergirl coming over to the Flash, then Arrow and Legends of Tomorrow.”
Greg Berlanti said in an interview “You really re trying to run a single production across three different productions, but they run as three separate entities.” He added “We have to figure out where we are borrowing one actor from where we are telling one cohesive story. Supergirl will participate but the story doesn’t actively begin there. There are some characters who show up in her episode, but the story begins in Flash episode, goes to Arrow and Legends of Tomorrow.” He also indicated that it’s a 3-hour story and there are three different scripts of 180 pages long that will be sifted through for the ultimate crossover. Earlier, everyone thought that the mega DC crossover will be based on a universe-altering, earth-shaking event with its origins in Supergirl season 2. But she is just going to be there without any motivation, maybe during the same time she is dealing with a villain with trans-dimensional powers.
The CW network released the schedule for its superhero shows premiering this fall, with the Flash setting the stage for the possible 4-night epic crossover plot. Here’s the schedule:
The Flash Season 2: Oct 4, Tuesday, 8:00 P.M
Arrow Season 5: Oct 5, Wednesday, 8:00 P.M
Supergirl Season 2: Oct 10, Monday, 8:00 P.M
Legends of Tomorrow Season 2: Oct 13, Thursday, 8:00 P.M