CW network, looking to make a little noise to coincide with its new-season launch, announced Monday it will debut Joss Whedon’s “Dr. Horrible’s Sing-Along Blog,” with Neil Patrick Harris (star of CBS’s “How I Met Your Mother”), Nathan Fillion (star of ABC’s “Castle”) and Felicia Day on Oct. 9.

The musical video went viral almost immediately when it launched online in 2008, garnering about 2.2 million views in the first week, and going on to attract more than 50 million viewers after that.

“Dr. Horrible” will debut just as CW is starting to roll out its new fall shows, starting the week of Oct. 2. Think of this as CW’s Olympics — just as NBC is debuting its new shows during the games to take advantage of the huge audience, CW is counting on the millions of “Dr. Horrible” fans to tune in.

Created as a three-part online musical in 2008 by Joss Whedon (“The Avengers,” “Buffy the Vampire Slayer”), the series is about as Billy, A.K.A. Dr. Horrible (played by Neil Patrick Harris), a budding super villain whose plans for world domination continually go awry. His two goals: getting accepted into the Evil League of Evil, and working up the guts to speak to his laundromat crush Penny (Felicia Day). The only thing standing in Billy’s way is his superhero arch nemesis, Captain Hammer (Nathan Fillion). With one big score, Billy could get into the E.L.E. and earn the respect of Penny, but only if he can keep her away from the dashing Captain Hammer.

The CW broadcast will be an edited down version of the online original.

“I’ve been a big fan….I tried to acquire it when was at ABC Studios for an ABC digital play,” CW president Mark Pedowitz told TV critics at Summer TV Press Tour 2012. He said he’s hoping if Whedon decides to do a sequel, he’ll consider doing it for CW.