Neil Patrick Harris arrives at the 66th Annual Tony Awards...

Neil Patrick Harris arrives at the 66th Annual Tony Awards in Manhattan. (June 10, 2012) Credit: AP

Dr. Horrible is coming to television.

The CW network says the 2008 online hit "Dr. Horrible's Sing-Along Blog" will air as an hour-long special in October.

The musical stars Neil Patrick Harris ("How I Met Your Mother") as Billy, aka Dr. Horrible, an inept would-be villain trying for world domination. Nathan Fillion ("Castle") co-stars as Dr. Horrible's nemesis, Captain Hammer. Felicia Day plays Penny, Dr. Horrible's crush.

"Dr. Horrible's Sing-Along Blog" was directed and co-written by Joss Whedon ("The Avengers," ''Buffy the Vampire Slayer"). It's scheduled to air on CW on Oct. 9.

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