The CW has released a special poster with a classic Hollywood musical vibe to promote the musical crossover episode of The Flash and Supergirl. The episode’s called “Duet”, hence the groansome, Batman-inspired punning tagline: “Dynamic Duet”. At least they didn’t go for “Flashdance” (though there’s a line in the chorus of that song – “I’m dancing for my life” – that’s strangely apt). The episode airs in the States on 21 March and exactly a week later on 28 March on Sky One in the UK. Click on the image for a larger version.