What does “Buffy the Vampire Slayer” and “Firefly” creator, Joss Whedon, Neil Patrick Harris and Nathan Fillion have in common? The hilarious new musical/super villain spoof blog series “Dr. Horrible’s Sing-Along Blog.” (click to watch)

The videos are getting more and more popular with loyal Whedon fans and first-time watchers alike, and with good reason. There’s everything from cheesey (but catchy) musical numbers, fan mail mockery, evil laughs and just a little bit of romance.

While the first week was free to watch on the official website (click to visit), people can now buy the blogs on itunes…or you can do a little searching on the Internet.

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