Dr. Horrible’s Sing-Along Blog is a 2008 musical tragicomedy miniseries in three acts, produced exclusively for Internet distribution. Filmed and set in Los Angeles, the show tells the story of Dr. Horrible (played by Neil Patrick Harris), an aspiring supervillain; Captain Hammer (Nathan Fillion), his nemesis; and Penny (Felicia Day), their shared love interest.
The movie was written by writer/director Joss Whedon, his brothers Zack Whedon (a television writer) and Jed Whedon (a composer), and Jed’s wife, actress Maurissa Tancharoen. The team wrote the musical during the 2007–2008 Writers Guild of America strike. The idea was to create something small and inexpensive, yet professionally done, in a way that would circumvent the issues that were being protested during the strike.