New Details Emerge on the CW 4 Episode Superhero Crossover

New details have emerged on the upcoming Arrow/The Flash/Supergirl/Legends of Tomorrow crossover happening later this year. Arrow/Legends producer, Marc Guggenheim revealed to press at San Diego Comic Con this past weekend that Supergirl (Melissa Benoist) will be the focus of the crossover.

Guggenheim told press, “It’s an external threat from outside the shows that will involve Supergirl coming over to Flash, then Arrow then Legends of Tomorrow,” However he did make clear that the episodes wouldn’t be solely Supergirl episodes, “I don’t like to oversell. She is going to be coming over but we’re not going to do a full on Supergirl crossover episode. I don’t want to give you the wrong impression.” Everyone will be involved in some form, but, besides Supergirl, we will have to wait and see which characters appear on which shows.

It sounds like Supergirl will be either following the threat to these shows or she is seeking out our favorite heroes for some help. The thing I am most intrigued to see is how they will get her on the same Earth as everyone else. Any thoughts?