Thanks to ComicBook.com, we now have word that Supergirl and The Flash will indeed crossover.
Grant Gustin will appear as The Flash on Supergirl as Barry Allen/The Flash next month, on the March 28th episode.
“We are so incredibly excited to announce something that we have dreamed of happening since we starting making Supergirl – The Flash and Supergirl are teaming up!,” said The Flash and Supergirl Executive Producers Greg Berlanti and Andrew Kreisberg. “We want to thank Grant Gustin for making the time to come visit (on top of his already immense workload) and all of the folks at CBS, The CW, Warner Bros. and DC for working this out. And finally thanks to the fans and journalists who have kept asking for this to happen. It is our pleasure and hope to create an episode worthy of everyone’s enthusiasm and support.”