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I'm really looking forward to the "Supergirl"-"Flash" musical crossover. Partly because I like musicals. Partly because I like both shows.

And partly because the first-season "Supergirl" episode that featured the Flash was magical. Melissa Benoist (Supergirl/Kara) and Grant Gustin (Flash/Barry) have a spark that was epitomized by a scene in which Barry races off to get ice cream cones for Kara and her pals.

"Watching Melissa's face … she was so excited," said executive producer Andrew Kreisberg.

"She ate, like, three off screen," added executive producer Ali Adler.

Benoist's utter delight is captivating. As are her interactions with Gustin.

"The shows are full of joy, because they're made with joy," Kreisberg said. "We love these characters."

"The Flash" hit the ground running and has turned in two very good seasons. "Supergirl" had growing pains, but Season 1 was promising.

On both, the heroes face dark villains and challenges. But the heroes are bright and optimistic.

So the musical episodes, which will air in early 2017, seem like a natural. Particularly given that Benoist and Gustin are both veterans of "Glee."

And "Flash" cast members Jesse L. Martin and Carlos Valdez and "Supergirl" co-star Jeremy Jordan are all singers.

Plus, executive producer Greg Berlanti teased that actors from his other two superhero shows will also appear — maybe John Barrowman ("Arrow") and four-time Tony nominee Victor Garber ("Legends of Tomorrow").

"There are a lot of time-travel shows this year," Berlanti said. "There is only one time-travel show where Victor Garber will be singing 'Edelweiss' to a bunch of Nazis. That is happening."

(On "Legends," that is.)

With all the singing talent available, "We would have missed an opportunity" if they didn't do a musical, said Berlanti. "So many times, it's a musical episode on the set between cameras rolling."

"When they're not acting or flying or punching, [Benoist and Gustin are] singing," Adler said. "When they're sitting in their chairs and waiting to act, they're singing."

"The minute we got Melissa, we were like, 'Oh, we should do this,' " Kreisberg said.

The musical episode will feature "mostly pre-existing songs," said Berlanti."I love the American Songbook. I am a big fan of Frank Sinatra stuff, so you might hear some of that."

And he's hoping for "at least" one original song.

But it won't be all about singing. Berlanti promised the writers will be "very careful about how it is they kind of break into song" and that the two episodes will feature a legitimate plotline with a particular villain-to-be-named-later.

Can't wait … although the episodes won't air until probably February.

Just gonna have to be patient.

Scott D. Pierce covers TV for The Salt Lake Tribune. Email him at spierce@sltrib.com; follow him on Twitter @ScottDPierce.