Based on the hilarious photoshoot the cast did at this year’s SDCC!!
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In an interview with CBR during Comic-Con International in San Diego, Guggenheim revealed the basic structure of how the crossover between Supergirl, The Flash, Arrow, and Legends of Tomorrow will work:
“It’s an external threat from outside the shows that will involve Supergirl coming over to The Flash, then Arrow, then Legends of Tomorrow.”
When Supergirl was announced to be moving to the CW for its second season, it was followed up by the news that all four shows would be a part of a mega-crossover event during the upcoming fall season. While details are still scarce on how Kara will arrive on the new earth from her current one, executive producer Marc Guggenheim (speaking at Comic-Con) revealed that her presence, along with a new threat, is what will instigate the events of the episodes. “It’s an external threat from outside the shows that will involve Supergirl coming over to The Flash, then Arrow then Legends of Tomorrow.”