The CW has been building up its shared television universe inspired by DC Comics heroes in recent years. Beginning with Arrow, the series introduced Barry Allen (Grant Gustin) before he spun off into his own solo series on The Flash. Then, Arrow and The Flash launched a third series, Legends of Tomorrow. Meanwhile, 2015 saw the debut of Supergirl -- a series developed by the minds behind The CW's DC TV universe, but one that aired its first season on CBS. However, this year saw Supergirl transition to The CW, while Kara Danvers (Melissa Benoist) recently joined the network's massive four-show crossover.
Still, there is another -- albeit smaller -- crossover planned for this season, as it was confirmed earlier this year that Supergirl and The Flash will join forces for a musical two-episode event. Rumors and reports started circling shortly thereafter that The Avengers' Joss Whedon would direct the episodes, with some speculating Neil Patrick Harris could reprise his Batman: The Brave and the Bold animated villain, Music Meister, in honor of the event.
In an interview with IGN promoting his upcoming Netflix show, A Series of Unfortunate Events, Harris was asked about what he's heard in regard to the Supergirl and The Flash musical episode, and whether he'd be willing to revive Music Meister for a live-action appearance. The actor responded:
I’ve heard about it, but that’s as much as it’s been. I did the Music Meister in a recording booth in L.A. 15 years ago, or something, then it comes out a year later. It was a fun episode, it was a good thing to do. But I’ve heard that Joss [Whedon] is involved [with The Flash and Supergirl] in some way, I don’t know if that’s true or not. … [Music Meister] wears a big zoot suit, from what I remember — the song was fun to sing. So I don’t know, we’ll see.
Based on Harris' comments, it would appear the actor hasn't officially been contacted by The CW to potentially appear in the Supergirl and The Flash crossover. In fact, little update on the two-part musical episode has been given since DC TV architect Greg Berlanti revealed in September they would be discussing music. Berlanti did reveal at the time that they had spoken to a potential songwriter who would join the production to pen original songs for the episodes, but no official announcement has since arrived.
Of course, The CW only recently aired the four-part crossover featuring heroes from Supergirl, The Flash, Arrow, and Legends of Tomorrow -- which proved to be a ratings powerhouse for the network. It's possible that Berlanti and those involved with The Flash and Supergirl musical episode held off on making announcements so as not to distract fans from the Heroes vs. Aliens crossover. Now with production on these series heading into a holiday break, we may not learn much about the musical crossover until next month.
That said, The Flash and Supergirl's musical crossover is expected to air sometime in February 2017 and, as such, will likely film at some point in January. So, although we still don't know much about what to expect from the Girl of Steel and the Scarlet Speedster teaming up for a musical adventure, it's likely we won't have to wait much longer for official details.
Supergirl returns to The CW on Monday, January 23, at 8pm EST. The Flash season 3 returns January 2017 in the same time slot on Tuesdays.