The Flash: Photos from "Duet"

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Supergirl returns to Earth-1 on The Flash Season 3 Episode 17 "Duet."

But the girl of steel is in bad shape after tangling with a villain known as the Music Meister. 

Team Flash is on the case, except it doesn't appear they have much luck in saving the superhero. Instead, Barry falls victim as well.

What happens when two superheroes are unconscious? A musical extravaganza! 

Scroll through the photos and share your thoughts on the latest crossover.

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1. What now? - The Flash Season 3 Episode 17

What now? - The Flash Season 3 Episode 17
A team full of scientists seems like the right place to bring Supergirl for help. But judging by the looks on everyone's faces, the solution will not be a simple one.

2. Alien Arrival - The Flash Season 3 Episode 17

Alien Arrival - The Flash Season 3 Episode 17
Mon-el and Hank arrive from National City with an unconscious Supergirl. It's up to Team Flash to rescue their super friend from a musical villain.

3. What's going on? - The Flash Season 3 Episode 17

What's going on? - The Flash Season 3 Episode 17
Team Flash is surprised by the unexpected arrival of their super friend.

4. Cisco's got questions - The Flash Season 3 Episode 17

Cisco's got questions - The Flash Season 3 Episode 17
Cisco seems a little suspicious about the alien arrival. Or maybe he's just wondering why Supergirl's unconscious and who the strangers are.

5. Cisco meets Mon-El - The Flash Season 3 Episode 17

Cisco meets Mon-El - The Flash Season 3 Episode 17
Knowing Cisco, he's probably got a lot of questions for the prince. Mainly, what happened?!

6. Barry's down, too! - The Flash Season 3 Episode 17

Barry's down, too! - The Flash Season 3 Episode 17
Well, that didn't take long. Somehow the Music Meister managed to place Barry under the same spell as Kara. We can't blame Mon-El for looking worried.

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The Flash
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The Flash Season 3 Episode 17: "Duet"
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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: ...green 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.