The making of 'Dr. Horrible's Sing-Along Blog'.

A look at the story behind Marvel Studios and the Marvel Cinematic Universe, featuring interviews and behind-the-scenes footage from all of the Marvel films, the Marvel One-Shots and "Marvel's Agents of S.H.I.E.L.D."

The cast and crew of Dr. Horrible's Sing-Along Blog (2008) perform a "most uncommon" musical commentary track for the show, acting as exaggerated versions of themselves. After reviewing the circumstances that led to the creation of Doctor Horrible, the characters sing of the contrary and cheap Joss Whedon, the aspirations of the minor actors, the egos of Nathan Fillion and Neil Patrick Harris, and everyone's favorite iPhone game.

Dr. Horrible's Sing-Along Blog is a 42-minute tragicomic musical in three acts, each released separately. It tells the story of Dr. Horrible, an aspiring supervillain, Captain Hammer, his superhero nemesis, and Penny, their mutual love interest. The movie was written by writer/director Joss Whedon, his brothers Zack Whedon and Jed Whedon, and Jed's then fiancée, actress Maurissa Tancharoen. The writing team penned the musical during the WGA 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.