Tonight, it’s the long-anticipated (at least by some of us) musical crossover between “The Flash” (7 p.m., CW/Ch. 30) and “Supergirl.”
It’s also a “Glee” reunion of sorts.
Grant Gustin, who stars as Barry Allen/The Flash, played the villainous Sebastian Smythe on seven episodes of “Glee.” Melissa Benoist, who stars as Kara Danvers/Supergirl, played good girl Marley Rose on 43 episodes of “Glee.”
And the villain in this episode, the Music Meister, is played by Darren Criss — who starred as good g...
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