Mon-El and Hank Henshaw arrive carrying a comatose Supergirl, who was attacked by the Music Meister; when the Music Meister attacks Barry, both he and Supergirl wake up in an alternate reality that they have to sing and dance their way out of.

The Flash delivers a musical episode with guest star Supergirl in an entertaining episode that has its ups and downs.

The episode carries over from this week’s Supergirl which ended with a mysterious character putting Supergirl in a trance and then heading to the Flash’s Earth. And that’s the first meh part of the episode. If you didn’t watch Supergirl you might be lost as to what’s going on and this episode does an only ok episode explaining the situation. It also doesn’t help that Mon-El who also comes over from Supergirl has been a douche lately, so it’s hard to cheer for him.

But, the focus on this episode is the musical itself which spoofs from various other musicals and shows off how much of the two casts have a musical background. Grant Gustin as Barry Allen/The Flash, Jesse L. Martin as Joe West, Melissa Benoist as Kara Danvers/Supergirl, Victor Garber as Martin Stein, John Barrowman as Malcolm Merlyn, Carlos Valdes as Cisco Ramone, and Jeremy Jordan as Winn Schott all have a long history in musical theater. Then there’s guest Darren Criss as the Music Meister. That’s three Glee actors on this episode.

The songs are decent and singing not too bad. Valdes and Jordan caught me by surprise at their talent but I didn’t know their background. Gustin is a much better dancer than singer and Benoist shines as usual. Everyone has their moment and it’s cheesy fun and that’s the name of the game, fun.

The actual plot is groan-inducing mostly due to the ending which caused a massive eye roll from me. It’s almost as if the writers didn’t know how to end the episode so this is what they came up with. It also washes over how bad Mon-El is for Kara and impacts Supergirl more than it does The Flash. But, the episode ends with Gustin serenading Iris in a cute scene full of saccharin.

There’s some good and likely made fans clamoring for a musical episode happy, but when you pull back and really think about it all, the episode is all flash and little substance. Its worse crime is overlooking the caustic relationship between Kara and Mon-El fixing it with what feels like fortune cookie wisdom.

Overall Rating: 7.05