Future Foundation
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It's coming March 28th on CBS:
Details on the episode are being kept under wraps. Theres also no word yet on whether Melissa Benoist will return the favor and appear on The Flash. However, heres why this crossover is important: If Barry Allen can make his way to National City, that means so too can Oliver Queen (Stephen Amell) in the future.
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 everyones enthusiasm and support.