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.
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Putting on a show - The Flash

Barry and Kara are forced to sing and dance when they're trapped by the Music Meister. Will their friends be able to rescue them?
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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.