Duet ( the Flash ) - wikipedia Duet ( the Flash ) 17th episode of the third season of The Flash `` Duet '' The Flash episode Promotional poster Episode no. Season 3 Episode 17 Directed by Dermott Daniel Downs Story by Greg Berlanti Andrew Kreisberg Teleplay by Aaron Helbing Todd Helbing Featured music Blake Neely Production code T27. 13117 Original air date March 21, 2017 ( 2017 - 03 - 21 ) Guest appearance ( s ) Melissa Benoist as Kara Danvers / Supergirl Victor Garber as Digsy Foss 's husband John Barrowman as Cutter Moran David Harewood as J'onn J'onzz / Martian Manhunter Jeremy Jordan as Grady Chris Wood as Mon - El / Tommy Moran Darren Criss as Music Meister Michelle Harrison as Nora Allen Episode chronology ← Previous `` Into the Speed Force '' Next → `` Abra Kadabra '' List of The Flash episodes `` Duet '' is the seventeenth episode of the third season of The CW television series The Flash, which aired on March 21, 2017. The episode was written by Aaron Helbing and Todd Helbing from a story by Greg Berlanti and Andrew Kreisberg, and was directed by Dermott Daniel Downs. The episode features a musical crossover with Supergirl and reunites Grant Gustin and Melissa Benoist with their former Glee co-star Darren Criss, who portrays the Music Meister. Jesse L. Martin also reunites with Jeremy Jordan, with whom he previously worked in the 2012 musical film Joyful Noise. The story begins at the end of the Supergirl episode `` Star - Crossed '', which aired on March 20, 2017, which saw Kara Danvers / Supergirl ( Benoist ) hypnotized into a coma by Music Meister, with Mon - El ( Chris Wood ) and J'onn J'onzz / Martian Manhunter ( David Harewood ) bringing her to Earth - 1 in hope that Team Flash can save her. Contents 1 Plot 2 Production 2.1 Casting 2.2 Filming 2.3 Music 3 Release 3.1 Broadcast 3.2 Marketing 4 Critical response 5 References 6 External links Plot J'onn J'onzz and Mon - El of Earth - 38 arrive on Earth - 1 with a comatose Kara Danvers / Supergirl, in hope that Team Flash can revive her. They warn Barry Allen / Flash that the escaped prisoner, Music Meister, claimed he would be coming for him too. Meister appears inside S.T.A.R. Labs and Barry and Wally West / Kid Flash confront him, but Meister attacks and places Barry in a similar coma. Barry wakes up to find himself without his powers in a musical world where he discovers Kara singing in a nightclub ( `` Moon River '' ) and where everyone resembles people they know in the real world. Meister tells Kara and Barry that if they follow the script, they will return to the real world. He warns them, however, that if they die in this world, they die in real life ( `` Put a Little Love in Your Heart '' ). Barry and Kara are forced to work as singers in a nightclub run by gangster Cutter Moran ( Malcolm Merlyn ), with Grady ( Winn Schott ) working as a piano player, and Pablo ( Cisco Ramon ) as a waiter. Cutter 's rivals Digsy Foss ( Joe West ) and his husband ( Martin Stein ) have their men kidnap Barry and Kara and tell them to find their daughter Millie Foss ( Iris West ) whom they believe is being held hostage by Moran. Barry and Kara find Millie in a forbidden relationship with Cutter 's son Tommy Moran ( Mon - El ). Kara and Barry convince the pair to reveal their love to their fathers and this helps the two protagonists to realize their own mistakes. Digsy, his husband and Cutter seemingly give their approval ( `` More I Cannot Wish You '' ), but subsequently decide to go to war. Meanwhile in the real world, Meister is revealed to have been stealing Barry and Kara 's powers, using them to rob a bank. Cisco, Kid Flash and J'onn, as the Martian Manhunter, arrive to fight Meister. They defeat him and lock him up in a cell at S.T.A.R. Labs. Back in the gangster / musical reality, Barry and Kara prepare to sing an original song to appease Cutter ( `` Super Friend '' ), but the gang war begins outside. Barry and Kara are shot in the crossfire and are dying with no survivors on either Moran or Foss 's side. Cisco, Mon - El, and Iris vibe into their world to save them, allowing Barry and Kara to admit their love for Iris and Mon - El respectively. They wake up in S.T.A.R. Labs. Meister escapes his cell, revealing to Barry and Kara that he just wanted them to realize their love before vanishing to teach his `` lessons '' to others. Kara, J'onn and Mon - El return to Earth - 38. Barry and Iris move back in together. Barry serenades and re-proposes to Iris, who accepts ( `` Runnin ' Home to You '' ). Production Casting Further information : List of The Flash characters and List of Supergirl characters Main cast members Grant Gustin, Candice Patton, Danielle Panabaker, Carlos Valdes, Keiynan Lonsdale, Tom Cavanagh, and Jesse L. Martin star as Barry Allen / Flash, Iris West, Caitlin Snow, Cisco Ramon / Vibe, Wally West / Kid Flash, Harrison `` H.R. '' Wells, and Joe West, respectively. In January 2017, Darren Criss was cast as Music Meister. Additionally, the episode 's guest cast includes Melissa Benoist as Kara Danvers / Supergirl, Jeremy Jordan as Winn Schott, David Harewood as J'onn J'onzz / Martian Manhunter and Chris Wood as Mon - El, reprising their roles from Supergirl, along with Legends of Tomorrow actor Victor Garber, and John Barrowman from Arrow and Legends of Tomorrow. Filming Filming of the episode occurred from February 1 until February 15, 2017, and was directed by series veteran Dermott Daniel Downs. Music The Flash -- Music from the Special Episode : Duet Soundtrack album by Various Artists Released March 22, 2017 ( 2017 - 03 - 22 ) Genre Soundtrack Length 17 : 16 Label WaterTower Music Producer Blake Neely In January 2017, Rachel Bloom revealed that she had penned an original song for the episode, which was titled `` Superfriends '', and was set to be sung by Gustin and Benoist. Bloom explained that, `` as soon as I heard that they were doing a musical crossover, I e-mailed ( CW president ) Mark Pedowitz who connected me to Greg ( Berlanti ) and Andrew ( Kreisberg ). I immediately offered them my services. As soon as they picked one of my song ideas, I hopped on the phone with my old Robot Chicken boss Tom Root and... based on that brainstorm, I wrote up the song ' Superfriends '. I am so excited to contribute more to the upward trend that is musicals in television and film. Music can be one of the most amazing and efficient forms of storytelling and character development. Also, it was really fun to write a comedy song for two superheroes. '' The song was later retitled `` Super Friend ''. Additionally, Benj Pasek and Justin Paul, winners of the Academy Award for Best Original Song for writing the lyrics for `` City of Stars '' in La La Land, were the authors of another song written for the episode, `` Runnin ' Home to You '', which was performed by Gustin. Kreisberg commented, `` Benj and Justin are the premiere songwriting duo of our time... To have them be a part of our musical episode is beyond our wildest expectations. We hope everyone falls in love with the song they wrote for us as much as we did. '' A soundtrack, titled, The Flash -- Music from the Special Episode : Duet, was released on March 22, 2017 from WaterTower Music containing the songs featured the episode. show The Flash -- Music from the Special Episode : Duet No. Title Writer ( s ) Performer Length 1. `` Meet the Music Meister '' Blake Neely 2 : 45 2. `` Moon River '' Johnny Mercer Henry Mancini Melissa Benoist 2 : 14 3. `` Put a Little Love in Your Heart '' Jackie DeShannon Jimmy Holiday Randy Myers Darren Criss, Jeremy Jordan, Carlos Valdes and John Barrowman 1 : 54 4. `` More I Cannot Wish You '' Frank Loesser Jesse L. Martin, Victor Garber and John Barrowman 2 : 38 5. `` Super Friend '' Rachel Bloom Tom Root Melissa Benoist and Grant Gustin 2 : 14 6. `` Runnin ' Home to You '' Benj Pasek Justin Paul Grant Gustin 2 : 46 7. `` Runnin ' Home to You '' ( guitar version ) Pasek Paul Grant Gustin 2 : 45 Total length : 17 : 16 Release Broadcast After beginning in the ending scene of the March 20, 2017 episode of Supergirl, `` Duet '' aired in the United States on The CW on March 21, 2017. It was simulcast with the US broadcast in Canada on CTV Two. Marketing In early March 2017, a promotional poster for the episode was released, with it being marketed as `` Dynamic Duet '', a play on words of the phrase `` dynamic duo ''. In Australia, where The Flash and Supergirl both air on Fox8, the crossover was marketed as a two - night event called `` DC Musical Crossover ''. Critical response Jesse Schedeen of IGN gave the episode an `` amazing '' 9.6 out of 10. He felt the premise was `` goofy '' but did a good job incorporating the existing continuity from both series, such as building `` directly on recent romantic tribulations in Barry and Kara 's lives. '' He enjoyed the team - up with Kid Flash, Martian Manhunter and Vibe, and was glad the writers did not `` attempt to force in a romantic subplot involving Barry and Kara. As their `` Super Friends '' number showed, they 're better as friends than lovers. '' The A.V. Club 's Scott Von Doviak awarded the episode a `` A − '', saying there was good chemistry between Gustin and Benoist and that Gustin was able to `` reconnect with the character 's endearing side. '' Von Doviak concluded, `` It 's probably logistically untenable for them to ever be more than ' super friends, ' but if this show ever needed the positive energy they generate together, now was certainly the time. '' References ^ Jump up to : `` ( # 317 ) `` Duet '' ``. The Futon Critic. March 17, 2017. Archived from the original on March 19, 2017. Retrieved March 2, 2017. Jump up ^ Bryant, Jacob ( March 14, 2017 ). `` ' The Flash ' Candice Patton on Barry and Iris ' Growing Rift ''. Variety. Archived from the original on March 19, 2017. Retrieved March 18, 2017. Jump up ^ Candice Patton ( @ candicekp ) ( March 15, 2017 ). `` Meet Millie Floss and gang next week on the musical crossover of The Flash ! '' ( Tweet ). Archived from the original on March 19, 2017. Retrieved March 18, 2017 -- via Twitter. Jump up ^ Ausiello, Michael ( January 23, 2017 ). `` Darren Criss Joins ' The Flash ' / ' Supergirl ' as Music Meister -- Musical ''. TVLine. Archived from the original on March 19, 2017. Retrieved January 23, 2017. Jump up ^ Abrams, Natalie ( January 20, 2017 ). `` Who 's singing in The Flash - Supergirl musical crossover ? ''. Entertainment Weekly. Archived from the original on March 19, 2017. Retrieved January 20, 2017. Jump up ^ David Harewood ( @ DavidHarewood ) ( February 1, 2017 ). `` Nice touch from The Flash peeps on my front door... # TheFlash # Crossover '' ( Tweet ). Archived from the original on March 19, 2017. Retrieved February 7, 2017 -- via Twitter. Jump up ^ Moore, Rose ( February 15, 2017 ). `` The Flash / Supergirl : Darren Criss Wraps Filming As Music Meister ''. ScreenRant. Archived from the original on March 19, 2017. Retrieved March 19, 2017. Jump up ^ Swift, Andy ( January 31, 2017 ). `` Flash / Supergirl Musical Crossover Features Duet Written by Rachel Bloom, Song From La La Land Duo ''. TV Line. Archived from the original on March 19, 2017. Retrieved March 18, 2017. Jump up ^ Truitt, Brian ( March 19, 2017 ). `` Superhero crossover goes full Bloom with its showtunes ''. usatoday.com. Archived from the original on March 24, 2017. Jump up ^ Petski, Denise ( January 31, 2017 ). `` ' La La Land ' Songwriters Pen Original Tune For ' The Flash ' Crossover ''. Deadline Hollywood. Archived from the original on March 19, 2017. Retrieved March 19, 2017. Jump up ^ Anderson, Jenna ( March 22, 2017 ). `` Supergirl / The Flash Musical Crossover Soundtrack Now Available ''. Comicbook.com. Archived from the original on March 23, 2017. Retrieved March 22, 2017. Jump up ^ Abrams, Natalie ( March 22, 2017 ). `` Music from ' The Flash ' - ' Supergirl ' Musical Crossover Now Available ''. Entertainment Weekly. Archived from the original on March 23, 2017. Retrieved March 22, 2017. Jump up ^ CTV ( @ CTV_Television ) ( March 21, 2017 ). `` Will they stick to the script ? Find out on a special musical episode of # TheFlash tonight at 8ET / PT on CTV Two ! '' ( Tweet ). Archived from the original on March 23, 2017. Retrieved March 23, 2017 -- via Twitter. Jump up ^ Damore, Megan ( March 17, 2017 ). `` The Flash & Supergirl Razzle - Dazzle in New Musical Crossover Poster ''. Comic Book Resources. Archived from the original on March 19, 2017. Retrieved March 18, 2017. Jump up ^ `` FOX8 - Supergirl is dancing back onto your screens next... '' Facebook. FOX8. March 16, 2017. Retrieved March 19, 2017. Jump up ^ Schedeen, Jesse ( March 21, 2016 ). `` The Flash : `` Duet '' Review ``. IGN. Archived from the original on 2017 - 03 - 22. Retrieved March 21, 2016. Jump up ^ Von Doviak, Scott ( March 21, 2016 ). `` A musical crossover with Supergirl is the cure for what ails The Flash ''. The A.V. Club. Archived from the original on 2017 - 03 - 22. Retrieved March 21, 2016. External links `` Duet '' on IMDb `` Duet '' at TV.com Arrowverse Arrow Characters Episodes Season 1 7 The Flash Characters Episodes Season 1 5 Supergirl Characters Episodes Season 1 Legends of Tomorrow Characters Episodes Season 1 Animated series Vixen Freedom Fighters : The Ray Cast and characters Cast members John Constantine Alex Danvers John Diggle Sara Lance Nia Nal Oliver Queen Thea Queen Harrison Wells Joe West Crossovers `` Flash vs. Arrow '' `` Heroes Join Forces '' `` Worlds Finest '' `` Invasion ! '' `` Duet '' `` Crisis on Earth - X '' `` Elseworlds '' Related Constantine The Flash episodes Season 1 `` Pilot '' `` Fastest Man Alive '' `` Things You Ca n't Outrun '' `` Flash vs. Arrow '' Season 2 `` Heroes Join Forces '' Season 3 `` Killer Frost '' `` Invasion ! '' `` Attack on Gorilla City '' `` Attack on Central City '' `` Duet '' Season 4 `` Crisis on Earth - X '' Season 5 `` Elseworlds '' Related Supergirl `` Worlds Finest '' `` Medusa '' Supergirl episodes Season 1 `` Pilot '' `` Stronger Together '' `` Fight or Flight '' `` How Does She Do It ? '' `` Livewire '' `` Red Faced '' `` Human for a Day '' `` Hostile Takeover '' `` Blood Bonds '' `` Childish Things '' `` Strange Visitor from Another Planet '' `` Bizarro '' `` For the Girl Who Has Everything '' `` Truth, Justice and the American Way '' `` Solitude '' `` Falling '' `` Manhunter '' `` Worlds Finest '' `` Myriad '' `` Better Angels '' Season 2 `` The Adventures of Supergirl '' `` Medusa '' `` Nevertheless, She Persisted '' Season 3 `` Crisis on Earth - X '' `` Battles Lost and Won '' Season 4 `` Elseworlds '' Related The Flash `` Duet '' `` Invasion ! '' Retrieved from `` https://en.wikipedia.org/w/index.php?title=Duet_(The_Flash)&oldid=866019341 '' Categories : 2017 American television episodes Crossover television Musical television episodes The Flash ( 2014 TV series ) episodes Television episodes about parallel universes American LGBT - related television episodes Dreams in fiction Hidden categories : Articles with short description Television episode articles with short description for single episodes Pages using infobox television episode with incorrectly formatted episode list Articles with hAudio microformats Album infoboxes lacking a cover All articles lacking reliable references Articles lacking reliable references from March 2017 Talk Contents About Wikipedia Deutsch Русский Edit links This page was last edited on 27 October 2018, at 18 : 57 ( UTC ). Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. 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Question: what episode does supergirl go on the flash
Answer: Duet