The Flash Promo: Can Barry and Supergirl Survive a Musical?

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Barry and Supergirl team up once again on The Flash Season 3 Episode 17 "Duet."

But they won't be able to use their speed and might to battle the Music Meister.

They're going to have to rely on their singing and dancing instead.

Singing and Dancing - The Flash Season 3 Episode 17

The video promo below explains a few of the rules in their new reality. Barry and Kara must stick to the script if they want to get out alive.

And they're not alone in the movie musical. Several familiar faces from their shared universes pop up to lend their musical talents.

Press play on the video and let us know what you think will happen on "Duet."

Need to catch up? You can watch The Flash online anytime!

The Flash
The Flash Season 3 Episode 17: "Duet"
Barry Allen/Flash
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The Flash Season 3 Episode 17 Quotes

Cisco [to Wally]: We win and we lose as a team. I'm coming with you.
J'onn: Me too.
Cisco: Look, J'onn. I respect this whole special agent situation you've got going on. But this problem right here needs someone with...
J'onn: [transforms to his Martian form]
Cisco: skin and a sick ass cape.
J'onn: Call me the Martian Manhunter.
Mon-El: I think you'll find that J'onn's a lot more than just a pretty face.

Barry [singing]: I'm your super friend. Your super friend. I'll be there in the nick of time if you're ever in a spot.
Kara [singing]: And if not there in time, you can just go back in time and give it another shot!
Barry: I'm actually not supposed to do that anymore.