“The Flash” and “Supergirl” are crossing over again, but this time under very different circumstances, as witnessed in the first teaser for the highly-anticipated musical crossover episode released Monday night.
Grant Gustin and Melissa Benoist are seen in 1940s garb, potentially tangling with mobsters, and yes, getting their musical on, especially Benoist, whose Supergirl is seen behind a microphone on a stage.
While the vast majority of the action will take place on “The Flash” in an episode fitting entitled “Duet,” the story will be set up at the end of the “Supergirl” episode preceding it the day before — much like with this year’s four-show crossover.
“Supergirl” will air Monday, March 20, followed by “The Flash” on Tuesday, March 21.
“Duet” will be directed by Dermott Downs and will feature singing performances from Arrowverse actors Gustin (Barry Allen/The Flash), Benoist (Kara Zor-El/Supergirl), Jesse L. Martin (Joe West), Victor Garber (Martin Stein/Firestorm), Carlos Valdes (Cisco Ramon/Vibe), Jeremy Jordan (Winn Schott), and John Barrowman (Malcolm Meryln), while also including non-singing guest star appearances from David Harewood (Hank Henshaw/Martian Manhunter) and Chris Wood (Mon-El).
Both “The Flash” and “Supergirl” were recently renewed for new seasons by The CW for Seasons 4 and 3, respectively.
“Supergirl” airs Mondays at 8 p.m. ET on The CW and “The Flash” airs Tuesdays at 8 p.m.
10 Most Epic TV Superhero Moments in 2016, From 'Arrow' to 'Luke Cage' (Photos)
Heartbreaking deaths, noble sacrifices, network moves and crossover events, superheroes sure have had a roller coaster of a year.
"Supergirl" flies to The CW In a rare move, CBS relinquished the rights to its only superhero drama, allowing the Kryptonian to join her CW brethren.
The CW
Mariah kills Cottonmouth, "Luke Cage" Mahershala Ali's villain met an abrupt and violent end when he goaded Luke Cage's politician cousin too hard, causing her to snap and throw him out a window -- and then beat him to death with a microphone stand. Ouch.
Netflix
The death of Black Canary, "Arrow" After a season-long mystery about "Who's in the grave?" the answer was revealed and devastated fans and other characters alike. The loss of Laurel Lance has left a void in the Arrowverse that's still gaping -- though her mysterious reappearance in the "Arrow" midseason finale may shake things up.
The CW
Staircase fight, "Daredevil" The hallway fight in Season 1 of "Daredevil" set the tone for the quality of the Marvel Netflix series, and the showrunners managed to top it in Season 2 with another long-take gem, this time involving dizzying staircase elements.
Netflix
When Barry met Kara, "Supergirl" Before the monster Arrowverse crossover brought Supergirl over to The CW, The Flash visited her in National City, marking a rare cross-network crossover event that delighted fans and opened the doors to so many possibilities.
CBS
"Agent Carter" canceled Despite a passionate fan base and a move to a more budget-friendly location (Hollywood) in Season 2, ABC couldn't find a way to give the world more "Agent Carter." Even star Hayley Atwell is hoping this is not the end of Peggy Carter.
ABC
Lincoln's sacrifice, "Agents of SHIELD" The Season 3 finale of ABC's Marvel series took no prisoners, killing off both Luke Mitchell's character, Lincoln, and Brett Dalton's agent-turned-villain, Ward, leaving Chloe Bennet's Daisy distraught and alone on the lam.
ABC
Legends of SuperFlarrow More than a dozen DC comic book characters appeared on screen together when The CW tackled its most ambitious crossover yet, bringing together the heroes of "Arrow," "The Flash," "Supergirl" and "Legends of Tomorrow."
The CW
A new brand of vigilante arrives, "Sweet/Vicious" Forget superpowered comic book characters, the newest heroes on the street are all about taking down campus rapists, making Jules and Ophelia the superhero team the world needs right now.
MTV
The return of Joker? ("Gotham") He was killed off on the show in 2015, but Cameron Monaghan seemed to hint his Joker wasn't done terrorizing the city in a tweeted-and-deleted photo.
Fox
1 of 11
TheWrap Best & Worst 2016: Here are the most explosive twists in comic-book-based series this year (Spoilers ahead!)
Heartbreaking deaths, noble sacrifices, network moves and crossover events, superheroes sure have had a roller coaster of a year.