The Flash: 19 Moments from "Duet" We Can't Stop Watching

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7. "Put a Little Love in Your Heart" - The Flash Season 3 Episode 17

"Put a Little Love in Your Heart" - The Flash Season 3 Episode 17
Led by the Music Meister, Cisco, Winn, and Malcolm Merlyn teamed up for a group song and dance number. Barry and Kara tried their hardest to resist, but no one could turn their back on such a fun number.

8. Barry and Kara argue over kicking in the door - The Flash Season 3 Episode 17

Barry and Kara argue over kicking in the door - The Flash Season 3 Episode 17
Tasked with finding a gangster's daughter, Barry and Kara track down Iris' alter ego. Fearing the worst, Barry prepares to kick the door in. But Supergirl's not willing to stand back. A quick debate about gender equality leads to them agreeing to do it together.

9. Kara and Barry are not amused by their loves - The Flash Season 3 Episode 17

Kara and Barry are not amused by their loves - The Flash Season 3 Episode 17
Our superheroes received quite a shock when they find the alternate versions of Iris and Mon-El locked in a romantic embrace. It turned out the two were in love and hiding it from their mobster father's. Kara's "gross" said it all.

10. "Dads?!?!" - The Flash Season 3 Episode 17

"Dads?!?!" - The Flash Season 3 Episode 17
After convincing Iris and Mon-El to tell the truth, Barry accompanied Iris home, and learned not only was Joe her father, so was Stein! Needless to say, Barry's shocked reaction led the men (and Iris) to jump to the wrong conclusion about his motives. Barry reminded them that he loved musicals.

11. Gangster Sing Along - The Flash Season 3 Episode 17

Gangster Sing Along - The Flash Season 3 Episode 17
Learning the truth led Joe, Stein, and Malcolm to burst into "More I Cannot Wish You." Their positive responses may have been a ruse for their children, but it was win-win for us hearing them sing.

12. "I'm Your Super Friend" - The Flash Season 3 Episode 17

"I'm Your Super Friend" - The Flash Season 3 Episode 17
Barry and Kara thought they saved the day. But since they were still trapped, they decided to finish the musical with an original number. Watching them make it up on the spot, while tap dancing, left us grinning from ear to ear.

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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.