Dr. Horrible’s Sing-Along Blog was originally made as a serialized web series in 2008.
A super hero musical which depicted the genesis of an evil villain, the 42 minute film was penned by Joss Whedon and his brothers and stars Neil Patrick Harris in the titular role, supported by Nathan Fillion and Felicia Day.
It started as a project to fill time during the Hollywood writer's strike, but turned into the first popular high-production-value web series. It was later released on DVD, and accompanied by a song-book. This fall, it will air on Television for the first time, when The CW airs it as part of its fall season kick-off.
Whedon and his fellow cast and crew have talked about doing something else with the property for some time now, but the group have all kept pretty busy since the end of the strike, many of them working with Whedon on his other projects, and lining up schedules to produce what is essentially a labor of love.
Now, however, development is ramping up on the sequel. Only Harris is announced to be on board for sure, but he's the only cast member who really needs to return anyhow, as the new story would have to necessarily be a new chapter in Horrible’s life, surrounded by new people and new dastardly plots, since Day and Fillion's characters were both taken out of the story in the denouement.
The plan is to go into development before the end of the year, but the method of final distribution is unclear. Whedon plans to make the film independent of potential outlets, and figure out what to do with the project when it's done.
Dr. Horrible’s Sing-Along Blog will have its television premiere on the evening of September 9th, 2012 on The CW. As of now, the sequel has no announced release date.