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Feb 03, 2016 Melissa Benoist By Christopher Roberts

Holy cross over! They said it wouldn’t happen, at least not anytime soon, but The Flash is coming to Supergirl, despite the two shows airing on separate networks and taking place in slightly different fictional universes. But both characters come from DC Comics and the two shows share many of the same producers. So Grant Gustin, who plays The Flash (aka Barry Allen) on the CW show of the same name will guest star on the March 28 episode of Supergirl, over on CBS.

It’s already been established on The Flash this season that inter-dimensional travel is possible. While both shows are set in the DC Universe, Supergirl‘s world is one that already features Superman, whereas in the CW DC shows (which also include Arrow and DC’s Legends of Tomorrow) no mention has been made of the Man of Steel, which is why it’s assumed that they exist in slightly alternative universes. Neither show is set in the same fictional universe as DC’s big screen movies (Man of Steel, Batman V Superman: Dawn of Justice, etc.), although this episode will air only three days after Batman V Superman comes out. The same parent company owns both CW and CBS, which also helps make this possible.

There are no current plans for Supergirl (Melissa Benoist) to appear on The Flash, but if the episode is a success then another crossover would probably be likely. Over on CW the various DC shows crossover regularly. The Flash was a spinoff of Arrow and every season they have a two-part crossover between the shows. And then both shows have recently spawned the spinoff DC’s Legends of Tomorrow, which features characters from both Arrow and The Flash. This also isn’t the first internetwork DC crossover to happen this season, last fall Matt Ryan’s John Constantine appeared in an episode of Arrow, although Constantine had already been cancelled by NBC at that point.

Flash and Supergirl executive producers Greg Berlanti and Andrew Kreisberg have issued a statement about the crossover: “We are so incredibly excited to announce something that we have dreamed of happening since we starting making Supergirl. 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.”