Los Angeles County Museum of Art

'The Flash' and 'Supergirl' musical crossover kills with cuteness

'The Flash' and 'Supergirl' musical crossover kills with cuteness

If the first CW television crossover between “The Flash” and “Supergirl” back in March of 2016 sparked the superhero friendship, Tuesday night’s musical revue cemented it with tap shoes.

Watching the jaunty episode titled “Duet” was like inhaling pure joy — a saccharine-saturated performance so ridiculously self-aware that both leads Barry “The Flash” Allen (Grant Gustin) and Kara “Supergirl” Danvers (Melissa Benoist) intermittently dropped character to look around the set, as if they too couldn’t believe the charm of what they were creating.

Former “Glee” star Darren Criss was cast as antagonist the Music Meister. He popped into the last few minutes of a previous...

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