When the Writers' Strike hit Tinseltown back in 2007-2008, productivity hit an understandable low. That is, for everyone but Joss Whedon who used the opportunity to make a studio-free, creator-owned musical superhero internet series (and when you put it all together, a movie of sorts - yes, we're stretching, but it's brilliant - so ssh).
Every song and scene's stuffed with catchy medleys and often hugely inappropriate gags. Case in point, the douchey 'good guy' superhero Captain Hammer (Nathan Fillion), who revels in schmooching the object of his nemesis Dr Horrible's affection right in front of his face.
Oh, and pointing out that, as for his name? Yep, the 'hammer is [his] penis'.