Joss Whedon, creator of "Buffy the Vampire Slayer," will premiere a musical entitled "Dr. Horrible's Sing-Along Blog" exclusively on on July 15.

In a posting on, Whedon - Oscar-nominated as part of the writing team of "Toy Story" - writes that he came up with the idea during the recent strike by the Writer's Guild of America: "I finally decided to do something very ambitious, very exciting, very mid-life-crisisy. Aided only by everyone I had worked with, was related to or had ever met, I single-handedly created this unique little epic. A supervillain musical, of which, as we all know, there are far too few."

Whedon writes that "Dr. Horrible," starring Neil Patrick Harris and Nathan Fillion, will be unveiled in three parts, with the entire miniseries debuting online by July 19. The musical will be available for free online until Sunday, July 20, at which point it will be taken down. Whedon reports that a DVD will be put on sale at a later date.

"Proving we can turn 'Dr. Horrible' into a viable economic proposition as well as an awesome goof will only inspire more people to lay themselves out in the same way," he writes. "It's time for the dissemination of the artistic process. Create more for less."

A teaser of the miniseries can be viewed at