DC Comics and The CW have really done a wonderful thing with their superhero TV lineup. Not only do they have 4 superhero shows running on the network, but they've also managed to intertwine those shows for awesome crossover events. Last year, we saw all four shows get together for an event for the ages where Supergirl, The Flash, Arrow, and Legends Of Tomorrow all joined forces over 3 episodes to fight an invading alien race. Now, producers of the shows are already working out the logistics for a potential full four episode mega-crossover event
Many fans noticed last year's crossover, as epic as it was, only focused on the universes of The Flash, Arrow, and Legends Of Tomorrow. Part of this was due to the fact that executive producer Andrew Kreisberg and team were only aware of Supergirl's switch from CBS to The CW when it was announced. Now that Supergirl is on The CW, it's much easier to coordinate actor schedules for when they can appear on the crossover and appropriately tie in storylines so that Supergirl's story is a part of the fold. Hopefully this time, Supergirl actress Melissa Benoist can get more of a break!
Andrew Kreisberg says another issue with last year's crossover that won't occur next time is "shutdown days," which is when the show can stop filming the series freeing up the cast for other appearances like this. While The Flash, Arrow, and Legends Of Tomorrow all had days like these built into their filming schedules, Supergirl did not. Kreisberg tells EW that now that The CW has picked up all the shows for next season, they're able to build those days into Supergirl's filming schedule. This will free up the cast and allow a true crossover storyline to happen on Supergirl, which wasn't able to be done the first time. But even with the logistics worked out, there has still been no solid confirmation of a true 4 show crossover event or how it will happen.
Part of this may be the difficulty of tying in the universes. With The Flash, Arrow, and Legends Of Tomorrow all taking place in the same Earth, it's very easy to cross over those shows and have the storylines affect all three shows in some way. Supergirl takes place on Earth 3, and Kara (Supergirl) was only able to join the fray last time when Barry Allen jumped universes to bring her character to the same Earth as the others. For the show to have a true 4 episode crossover, they'll have to find a way to create a threat that affects two separate worlds, or just bounce between the two. With the upcoming musical crossover of The Flash and Supergirl still to come this year, I guess we'll get a better idea of how writers plan on making that happen should they do it.
Personally, I can't wait to see if Andrew Kreisberg and the others can pull off a 4 episode crossover. DC has a wide variety of villains to choose from, and anyone who is so bad they can affect two different worlds is definitely going to be a villain audiences have been dying to see.
All four shows are currently in the latter half of their seasons, and you can catch them on The CW. If you're late to the game and love hero shows, maybe wait for all the episodes to hit Netflix and check our midseason premiere guide to see when Marvel's Iron Fist premieres!