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Tonight, it's the long-anticipated (at least by some of us) musical crossover between "The Flash" (7 p.m., CW/Ch. 30) and "Supergirl."

It's also a "Glee" reunion of sorts.

Grant Gustin, who stars as Barry Allen/The Flash, played the villainous Sebastian Smythe on seven episodes of "Glee." Melissa Benoist, who stars as Kara Danvers/Supergirl, played good girl Marley Rose on 43 episodes of "Glee."

And the villain in this episode, the Music Meister, is played by Darren Criss — who starred as good guy Blaine Anderson in 90 episodes of "Glee."

In tonight's episode of "The Flash," Mon-El (Chris Wood) and Hank Henshaw (Dave Harewood) show up on Earth 1 with a comatose Supergirl — who has been "whammied" by the Music Meister. The MM puts the Flash in a coma, too, and they 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.

The episode, titled "Duet," owes an enormous debt to the musical episode of "Buffy the Vampire Slayer" ("Once More with Feeling") that aired more than a decade ago. "Duet" comes up with a villain to explain how Barry and Kara find themselves in the middle of a musical, and a strong attempt is made to have the episode drive forward the plot in both shows.

(The results are entirely predictable, but there are payoffs for fans of each show.)

"Buffy" did it a lot better, with an episode full of original music. "The Flash" leaves you wanting more, if only because most of the music is not original and it feels like there should have been more of it.

But there are some nice musical performances from "Flash" co-stars Carlos Valdes and Jesse L. Martin along with a few actors from the other DC superhero shows who can sing, including Victor Garber ("Legends of Tomorrow"); Jeremy Jordan ("Supergirl"); and John Barrowman ("Arrow," "Legends").

There's a nice original song for Barry and Kara (co-written by "Crazy Ex-Girlfriend" star/producer Rachel Bloom). And there are some genuine laughs.

Back in 2006, "Once More with Feeling" blew us away with how great it was. "Duet" is nice. But it's not great.

Elsewhere on TV ...

• "The Voice" (7 p.m., NBC/Ch. 5): The battles round continues.

• "New Girl" (7 p.m., Fox/Ch. 13): Jess avoids her feelings for Nick by taking care of her dad in Portland.

• "The Flash" (7 p.m., CW/Ch. 30): It's the long-awaited musical episode — the Flash and Supergirl wake up in an alternate reality that they have to sing and dance their way out of to defeat the Music Meister (Darren Criss, "Glee").

• Men's college volleyball (7 p.m., BYUtv): Princeton at BYU

• "If Loving You is Wrong" (7 p.m., OWN): Kelly learns the shocking whereabouts of her neighbor. (Season premiere)

• "The Mick" (7:30 p.m., Fox/Ch. 13): When Chip appears to be getting scammed by a girl online, Mickey tries to teach him how to avoid being a victim.

• "Trial & Error" (8 and 8:30 p.m., NBC/Ch. 5): Josh and his team discover a ``sex print'' on the wall, which leads them to a shocking new suspect; Josh is sidetracked when the new suspect turns up in a coma.

• "Bones" (8 p.m., Fox/Ch. 13): Brennan testifies for Zach; Angela reveals some big news; the team learns Kovac has escaped.

• "DC's Legends of Tomorrow" (8 p.m., CW/Ch. 30): The team lands in France during World War I, where they enlist the help of a soldier named John Ronald Reuel Tolkien — J.R.R. Tolkien, for you non-"Hobbit" fans.

• "The Detour (8 p.m., TBS): At Delilah's taekwondo tournament, Nate has tough conversations with Jared and Carlos.

• "People Icons" (9 p.m., ABC/Ch. 4): Performers, who died too soon, including Whitney Houston, Patrick Swayze, Robin Williams and Prince.

• "Chicago Fire" (9 p.m., NBC/Ch. 5): Members of the fire and rescue squads become hostages when a group of armed gang members invades Firehouse 51.

• "Frontline" (9 p.m., PBS/Ch. 7): Militias work with the military to fight for control in Iraq; the impact of the fighting on civilians; a look at areas where the Islamic State group has been expelled.

• "The Fosters" (9 p.m., Freeform): Callie's relentless pursuit of justice impacts her relationship with AJ.

• "Being Mary Jane" (10 p.m., BET): Mary Jane and Justin join forces to try to oust Ronda from the anchor chair. (Season finale)

• "Switched at Birth" (10 p.m., Freeform): Toby is caught in the middle of his mother's wishes and his wife's feelings about religion; Melody asks her sons to make amends.

• "Face Off" (10 p.m., Syfy): The remaining artists form two super teams to create a family of deranged, murderous mutants.

• "Outsiders" (10 p.m. WGN): Tensions between the Farrells and the coal company take a devastating turn.

• "Teachers" (11 p.m., TV Land): Hot Dad volunteers for lunch duty and Ms. Bennigan works up the nerve to ask him out on a real date. (Season finale)

• "Chrisley Knows Best" (11 p.m., USA): Savannah struggles with her clothing line; Chase tries to get Lilo's behavior under control.

• "Imposters" (11 p.m. Bravo): Maddie and Patrick's getaway is equal parts romance and deception; Jules comes face to face with her past.

• "The Americans" (11 p.m., FX): Philip and Elizabeth tell Paige more about the family business; an operation takes an unexpected turn.

• "Cosplay Melee" (11 p.m., Syfy): In the premiere of this new competition series, cosplayers have to create an original character inspired by their favorite sci-fi space opera.

• "Detroiters" (11:30 p.m., Comedy Central): After getting fired by a furniture store client, Tim and Sam try to make an ad for the store's competitor.