Holy "Glee" Halloween episode, Batman! It's Darren Criss as Robin, the Boy Wonder?

"Glee" co-creator Ryan Murphy tweeted a photo of Criss donning Robin's iconic tights -- sans the official symbols of Batman's sidekick -- on set of the Fox musical series. And there's a Blaine twist to the costume, take a look at that bow tie.

While no other details were given, it looks like this could be a scene from a Halloween episode of "Glee." The series previously did an entire episode dedicated to "Rocky Horror Picture Show" around Halloween time.

In other "Glee" Season 4 news, TVLine reports Lea Michele and newcomer Melissa Benoist will cover Billy Joel's "New York State of Mind" and "Call Me Maybe" will be featured in the Season 4 premiere with vocals by Criss, Heather Morris and Jenna Ushkowitz.

"Glee" Season 4 premieres Thurs., Sept. 13 at 9 p.m. ET on Fox.

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