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.

Who is that masked man keeping crime away from the halls of McKinley? twitter.com/MrRPMurphy/sta…
— Ryan Murphy (@MrRPMurphy) August 18, 2012

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.