Whedonverse fans have been gunning for a Dr. Horrible's Sing-Along Blog sequel ever since the musical miniseries hit the Internet in 2008. Could they finally be getting their wish?

Yesterday, Dr. Horrible actress Felicia Day posted a group picture with the entire cast — including Castle's own Nathan Fillion, who plays Captain Hammer. While they don't appear to be filming or rehearsing anything — they were actually just seeing a play produced by Dr. Horrible co-star Neil Patrick Harris — their random reunion could be the first sign that a sequel is in the works.

Credit: Twitter

Director Joss Whedon revealed a tentative date for the sequel — within the next year, he told Variety — and Nathan has already confirmed that he'd be on board for part deux. NPH, who played Captain Hammer's arch nemesis, is also game to reprise his title role.

Nathan also posted a picture of the Dr. Horrible clan on his WhoSay account, sparking fan speculation about the nature of their rendezvous.

Although we've been skeptical about a Dr. Horrible sequel in the past — especially considering how busy Nathan is with his work on ABC's Castle — we're getting jazzed about the possibility. Plus, we can't think of a better time for Joss to confirm the news — Dr. Horrible is set to make its television debut in less than two weeks on The CW.

What do you think, Fillion fanatics? Is a Dr. Horrible's Sing-Along Blog sequel in the works?


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