Rumors have persisted for quite some time, but CBS and The CW announced today that Barry Allen/The Flash will be heading to National City where he’ll meet Kara Danvers/Supergirl. Grant Gustin, who plays Barry Allen/The Flash will be fighting along Melissa Benoist‘s Supergirl on Monday, March 28 at 8/7c on CBS’ Supergirl.

In the release announcing the event episode Executive Producers Greg Berlanti and Andrew Kreisberg not only thanked CBS, The CW, and DC Comics, and Gustin for working this out, but also the fans (and even journalists) who were vocal in wanting to see this happen.

This isn’t the first channel crossover we’ve seen. Constantine‘s John Constantine, which aired on NBC before being cancelled, appeared on an episode of Arrow (a show which The Flash shares a “universe”) during the latest season. This crossover would mean all four shows share a universe/multiverse.