If, after enjoying The CW's four-night "Invasion!," you're ready for another superhero crossover, you're in luck, because before the alien Dominators make their return on "Supergirl," and before that potential major death on "The Flash," the Girl of Steel and the Scarlet Speedster will reunite for an out-of-this world, metahuman musical.

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It's one that some corners of the internet hope might see Neil Patrick Harris bring his menacing, yet melodic, role as Music Meister from the animated "Batman: The Brave and the Bold" into the world of live-action. However, when asked about the rumor while promoting Netflix's "Lemony Snicket's A Series of Unfortunate Events," the actor didn't provide much hope to fans.

"I've heard about it, but that's as much as it has been," Harris told IGN. "I mean, I did the Music Meister in a recording booth in L.A. ... 15 years ago or something, y'know, and it comes out a year later. [...] It was a fun episode, it was a good thing to day. But I've heard that Joss [Whedon] is involved in some way, but I don't know if that's true or not. ... He wears a big zoot suit, from what I remember. The song was fun to sing, so I don't know; we'll see."

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Harris, who starred in Whedon's 2008 musical "Dr. Horrible's Sing-Along Blog" and, later, in the  Broadway production of "Hedwig and the Angry Inch," originated the animated role of Music Meister on "Batman: The Brave and the Bold's" 2009 episode "Mayhem of the Music Meister!" In the acclaimed musical episode, the villain could control others -- including Batman, Green Arrow, Black Canary, Aquaman, Gorilla Grodd and Black Manta -- through song.

Not much is known about the two-episode "Flash"/"Supergirl" crossover, set to air in the spring, other than it will feature original songs and could include characters from any Earth or timeline in the Arrowverse. And while fans may not get a Music Meister this season, but they will get a Mister Mxyzptlk on "Supergirl." Seems like a fair trade-off.

Airing Mondays at 8 p.m. ET/PT on The CW, "Supergirl" stars Melissa Benoist, Mehcad Brooks, Chyler Leigh, Jeremy Jordan, David Harewood and Chris Wood. Airing Tuesdays at 8 p.m., "The Flash" stars Grant Gustin, Candice Patton, Danielle Panabaker, Carlos Valdes, Tom Cavanagh, Jesse L. Martin and Keiynan Lonsdale.

(via ScreenRant)