After months of rumors, ComicBook.com has learned that Grant Gustin will appear on Supergirl in his role as Barry Allen/The Flash next month.

Gustin will head to National City on the series' March 28 episode, the details of which haven't yet been released.

"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.”

Supergirl airs Monday nights at 8 p.m. ET/PT on CBS. The Flash airs Tuesdays at 8 p.m. ET/PT on The CW.