The Flash 3×17 “Duet” is the long-anticipated musical crossover with Supergirl. Here are five teases to whet your appetite before the episode airs.

The synopsis for “Duet” reads:

“Barry (Grant Gustin) and team are surprised when Mon-El (guest star Chris Wood) and Hank Henshaw (guest star David Harewood) arrive on their Earth carrying a comatose Supergirl (guest star Melissa Benoist) who was whammied by the Music Meister (guest star Darren Criss). Unable to wake her up, they turn to Team Flash to save her. However, the Music Meister surprises The Flash and puts him in a similar coma, one that Team Flash can’t cure. Kara and Barry wake up without their powers in an alternate reality where life is like a musical and the only way to escape is by following the script, complete with singing and dancing, to the end.”

Here are five teases to get you ready for the episode:

The whole thing is very meta

As the trailer hints, Barry and Kara are fully aware that their musical surroundings aren’t real. When Music Meister tells the pair that they must follow the script to survive their ordeal, Kara and Barry must draw on their shared love of musicals to move through the story. And the pair are not short on quips about the difference between musicals and the real world.

Darren Criss is delightful

The big crossover goes Glee with the introduction of Darren Criss as Music Meister. Admittedly, I would have liked to have seen more of Criss in this episode, especially getting to show off his musical chops, but he’s hard to look away from when he’s on screen. The character’s motives leave something to be desired, but considering the whole musical thing, it works.

Plus, for fans of the show, there is an amusing turn of the tides as it’s now Criss as the villain singing at Grant Gustin’s hero while on Glee it was Gustin’s mischievous Sebastian Smythe singing at Criss’s Blaine Anderson.

It’s a mix of original and covered songs

Melissa Benoist sings a lovely rendition of “Moon River” to open the festivities while Criss, Jeremy Jordan, Carlos Valdes and John Barrowman join forces for a cover of “Put a Little Love in Your Heart.” Jesse L. Martin, Victor Garber and Barrowman also join forces for a song.

Meanwhile, Gustin and Benoist sing a delightful original song by Crazy Ex-Girlfriend‘s Rachel Bloom titled “I’m Your Super Friend” (I’ll be humming this one for days) and Gustin closes out the episode with an original song written by La La Land‘s Benj Pasek and Justin Paul.

It’s all about love

This episode might as well have taken place on Valentine’s Day, considering how central love is to both the musical plot that Barry and Kara are struggling to work through and the plot going on in the real world. Both Kara and Barry are in not-so-great places in their love lives going into the dream world, and that ends up mattering quite a bit.

It’s gorgeous

In case the promo stills and posters haven’t been enough to convince you, the scenes shot in the musical world are absolutely gorgeous. The scenes take on a golden tinge that evoke times gone by while the costumes, especially the dresses that Kara dons, are stunning. For those who might be skeptical about the musical, the visuals alone are worth the price of admission.

The Flash 3×17 “Duet” airs Tuesday, March 21 at 8:00 p.m. ET on The CW.

Are you looking forward to the ‘Flash’/’Supergirl’ musical crossover?

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