Flash-Supergirl musical crossover: Inside Glee reunion

Natalie Abrams for ew.com

Here’s how: As the Scarlet Speedster and Girl of Steel experience turmoil in their interpersonal relationships, they’re whammied by the Music Meister, a less mustache-twirling, more manipulative villain

While I admit I'm far more excited for the "crossover" part than the "musical' part, I'm glad that it seems the singing will be a plot point and not just random songs for no, in-story, reason.