(Photo: Jack Rowand/The CW)

The Flash will pick up the baton from Supergirl after the dramatic ending to “Star-Crossed” on Monday. Now, it’s up to the Flash and his friends to help Kara’s friends save her from the evil Music Meister. The special musical episode of The Flash, titled “Duet,” airs on Tuesday, March 21 at 8 p.m. ET. Read on for a preview of the episode.

At the end of “Star-Crossed,” the DEO in Supergirl’s dimension captured Music Meister (guest star Darren Criss). But he only let himself get captured so he could put Supergirl into a trance and steal tech so he could jump to Barry’s dimension.

Once there, Music Meister puts Barry and Supergirl in a dream landscape, where they have to sing their way out of this mess. Unfortunately, if they get killed in their dream, they also get killed in the real world! Other members of the Flash and Supergirl casts appear in the dream as new characters.

The Flash Duet, The Flash spoilers, The Flash preview, The Flash Supergirl

(Photo: Jack Rowand/The CW)

DATE: March 21, 2017

TIME: 8 p.m. ET

CHANNEL: The CW (Click here to go to TVGuide.com’s channel guide. To find out what channel The CW is for you, change “provider” to your cable/satellite provider.)

EPISODE DESCRIPTION: “Duet” – ” Barry (Grant Gustin) and team are surprised when Mon-El (guest star Chris Wood) and Hank Henshaw (guest star David Harewood) arrive on their Earth carrying a comatose Supergirl (guest star Melissa Benoist) who was whammied by the Music Meister (guest star Darren Criss). Unable to wake her up, they turn to Team Flash to save her. However, the Music Meister surprises The Flash and puts him in a similar coma, one that Team Flash can’t cure. Kara and Barry wake up without their powers in an alternate reality where life is like a musical and the only way to escape is by following the script, complete with singing and dancing, to the end.”

The Flash Duet, The Flash spoilers, The Flash preview, The Flash Supergirl

(Photo: Jack Rowand/The CW)

Grant Gustin as Barry Allen/The Flash
Candice Patton as Iris West
Danielle Panabaker as Caitlin Snow
Carlos Valdes as Cisco Ramon
Keiynan Lonsdale as Wally West
Tom Cavanah as H.R. Wells
Jessie L. Martin as Joe West
John Barrowman as Malcolm Merlyn

Guest Star
Darren Criss as Music Meister
Melissa Benoist as Kara Danvers/Supergirl
David Harewood as J’onn J’onzz
Jeremy Jordan as Winn Schott
Chris Wood as Mon-El

Supergirl developed by Greg Berlanti, Ali Adler & Andrew Kreisberg; Based on characters created by Jerry Seigel and Joe Schuster

Darren Criss as Music Meister: 5 Fast Facts You Need to Know

Darren Criss joins his former Glee co-stars Melissa Benoist and Grant Gustin for a Supergirl and The Flash musical crossover. Learn about his character, the Music Meister, and his career.

Click here to read more