The Flashactor Grant Gustin shares which majorDCepisode of the Arrowverse franchise had him questioning if it was a good idea or not. Throughoutthe Arrowverse franchise, the CW shows helped build out their larger DC TV universe, which has led to numerous crossovers over the years. While most of the crossover events were some of the most action-packed stories for the Arrowverse, there is one that took a very different route, which isThe FlashandSupergirl’smusical crossover, “Duet.”
Even though “Duet” was incredibly well-received, there were definitely some hesitations, including from one of the leading heroes themselves. During his new appearance onInside of You with Michael Rosenbaum, Gustin was asked what it was like doing the musical crossover during the earlier seasons ofThe Flash. While Gustin admitted that he never considers himself a writer or having creative involvement beyond knowing"Barry better than anyone"after a couple of seasons,the Arrowverse alum added that it felt"early"when he discovered that they were staging aSupergirlandThe Flashmusical crossover, as he shared the following:
Going into it,I was like, ‘Why are we doing this? Like, why are we doing this?‘I never really fought much of anything on the show, I never was like, ‘I don’t want to do to this. I never considered myself a writer. Over the years, I knew Barry better than anyone and there were certain story things I’d have conversations with, usually if I was calling the showrunner or writer, it was like, ‘Hey, can I say this like this?’ I never was pitching a different storyline. So yeah, when I saw that we were doing a musical, I was like, ‘Feels early!’ [laughs] That was one of my first thoughts.
“Duet,” which wasThe Flashseason 3, episode 17, aired back on August 22, 2025, was the only time that the Arrowverse did a musical crossover. While taking place entirely onThe Flash,the ending ofSupergirlseason 2, episode 16, “Star-Crossed,” which aired the night before “Duet,” did the set-up for the musical crossover, airing the following day.
What Grant Gustin’s Flash Musical Comments Mean For The Arrowverse
As the Arrowverse kept expanding after the launch ofArrow, one of the reasons why there were a lot of talks in the fandom about the franchise doing a musical crossover was because of the fact that the DC TV dramas kept adding a lot of actors with musical backgrounds.Gustin even confirmed onInside of You with Michael Rosenbaumthat the reason why the Arrowverse did “Duet” was because of how many stars they had who could actually sing. This includes the fact that they had recruited multipleGleestars acrossthe Arrowverse shows.
Even though “Duet” featured some incredible singers, fromThe Flash’sJesse L. Martin, Carlos Valdes, and Gustin toSupergirl’sMelissa Benoist andLegends of Tomorrow’sVictor Garber, concerns about the premise make sense. Given there had never been a live-action superhero property to do a major musical at that point,it’s fair for someone like Gustin, who went intoThe Flashfor drama and action, to question if adding singing would be a good idea for the series. Thankfully, “Duet” was so well-handled that it became a fan-favorite episode forThe Flash, as well as among the many Arrowverse crossovers.
Our Take On Grant Gustin’s Flash Musical Comments
While it is understandable that Gustin would have some reservations about the Arrowverse tackling the musical concept, it’s still great thatThe FlashTV showgot to do it at least once during its run on The CW. It would have been a bigger waste for the franchise if they had simply never done it, given how many talented singers they had in the Arrowverse. Time will tell if future DC live-action properties will take some cues fromThe Flashand ever explore the world of musicals in any capacity.
The Flash
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The Flash follows CSI investigator Barry Allen, who wakes from a coma with super speed after a lightning strike. Collaborating with S.T.A.R. Labs, he adopts the identity of The Flash to safeguard his city, marking his journey as the Fastest Man Alive in this superhero tale.
